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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/features/types/" rel="canonical"><link href=../trailing_commas/ rel=prev><link href=number_handling/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Types - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new 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xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Types </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio name=__palette 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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/features/types/" rel="canonical"><link href=../trailing_commas/ rel=prev><link href=number_handling/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Types - JSON for Modern C++</title><link rel=stylesheet href=../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../css/custom.css><script>__md_scope=new 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xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Types </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio name=__palette 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23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 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class value_t {
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<<enumeration>>
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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/features/types/number_handling/" rel="canonical"><link href=../ rel=prev><link href=../template_parameters/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Number Handling - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Number Handling </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio 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15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9Line truncated
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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/features/types/number_handling/" rel="canonical"><link href=../ rel=prev><link href=../template_parameters/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Number Handling - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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<svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Number Handling </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio 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15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 12 5 9Line truncated
|
||||
A["number literal"] --> B{"has a fraction (.) or exponent (e/E)?"}
|
||||
B -->|"yes"| F["number_float_t"]
|
||||
B -->|"no"| C{"has a leading minus sign?"}
|
||||
|
||||
@@ -215,19 +215,199 @@ The library does not sort or de-duplicate keys itself; the behavior described in
|
||||
a custom `ObjectType`.
|
||||
|
||||
```cpp
|
||||
--8<-- "examples/custom_object_type.hpp"
|
||||
#pragma once
|
||||
|
||||
#include <map>
|
||||
#include <utility>
|
||||
|
||||
// A minimal, self-contained ObjectType built around a private std::map.
|
||||
// key_compare is deliberately not exposed: when an ObjectType has no
|
||||
// key_compare member, the library falls back to its own default comparator.
|
||||
// See https://json.nlohmann.me/features/types/template_parameters/#objecttype
|
||||
template<class Key, class T, class Compare, class Allocator>
|
||||
class custom_object_type
|
||||
{
|
||||
using map_t = std::map<Key, T, Compare, Allocator>;
|
||||
map_t data_;
|
||||
|
||||
public:
|
||||
using key_type = typename map_t::key_type;
|
||||
using mapped_type = typename map_t::mapped_type;
|
||||
using value_type = typename map_t::value_type;
|
||||
using size_type = typename map_t::size_type;
|
||||
using iterator = typename map_t::iterator;
|
||||
using const_iterator = typename map_t::const_iterator;
|
||||
|
||||
custom_object_type() = default;
|
||||
custom_object_type(const custom_object_type&) = default;
|
||||
custom_object_type(custom_object_type&&) = default;
|
||||
custom_object_type& operator=(const custom_object_type&) = default;
|
||||
custom_object_type& operator=(custom_object_type&&) = default;
|
||||
|
||||
template<class InputIt>
|
||||
custom_object_type(InputIt first, InputIt last) : data_(first, last) {}
|
||||
|
||||
iterator begin()
|
||||
{
|
||||
return data_.begin();
|
||||
}
|
||||
iterator end()
|
||||
{
|
||||
return data_.end();
|
||||
}
|
||||
const_iterator begin() const
|
||||
{
|
||||
return data_.begin();
|
||||
}
|
||||
const_iterator end() const
|
||||
{
|
||||
return data_.end();
|
||||
}
|
||||
const_iterator cbegin() const
|
||||
{
|
||||
return data_.cbegin();
|
||||
}
|
||||
const_iterator cend() const
|
||||
{
|
||||
return data_.cend();
|
||||
}
|
||||
|
||||
bool empty() const
|
||||
{
|
||||
return data_.empty();
|
||||
}
|
||||
size_type size() const
|
||||
{
|
||||
return data_.size();
|
||||
}
|
||||
size_type max_size() const
|
||||
{
|
||||
return data_.max_size();
|
||||
}
|
||||
void clear()
|
||||
{
|
||||
data_.clear();
|
||||
}
|
||||
|
||||
iterator find(const key_type& key)
|
||||
{
|
||||
return data_.find(key);
|
||||
}
|
||||
const_iterator find(const key_type& key) const
|
||||
{
|
||||
return data_.find(key);
|
||||
}
|
||||
size_type count(const key_type& key) const
|
||||
{
|
||||
return data_.count(key);
|
||||
}
|
||||
|
||||
std::pair<iterator, bool> emplace(const key_type& key, const mapped_type& value)
|
||||
{
|
||||
return data_.emplace(key, value);
|
||||
}
|
||||
|
||||
std::pair<iterator, bool> insert(const value_type& value)
|
||||
{
|
||||
return data_.insert(value);
|
||||
}
|
||||
|
||||
template<class InputIt>
|
||||
void insert(InputIt first, InputIt last)
|
||||
{
|
||||
data_.insert(first, last);
|
||||
}
|
||||
|
||||
mapped_type& operator[](const key_type& key)
|
||||
{
|
||||
return data_[key];
|
||||
}
|
||||
|
||||
mapped_type& at(const key_type& key)
|
||||
{
|
||||
return data_.at(key);
|
||||
}
|
||||
const mapped_type& at(const key_type& key) const
|
||||
{
|
||||
return data_.at(key);
|
||||
}
|
||||
|
||||
iterator erase(iterator pos)
|
||||
{
|
||||
return data_.erase(pos);
|
||||
}
|
||||
iterator erase(iterator first, iterator last)
|
||||
{
|
||||
return data_.erase(first, last);
|
||||
}
|
||||
size_type erase(const key_type& key)
|
||||
{
|
||||
return data_.erase(key);
|
||||
}
|
||||
|
||||
void swap(custom_object_type& other)
|
||||
{
|
||||
data_.swap(other.data_);
|
||||
}
|
||||
|
||||
friend bool operator==(const custom_object_type& lhs, const custom_object_type& rhs)
|
||||
{
|
||||
return lhs.data_ == rhs.data_;
|
||||
}
|
||||
friend bool operator<(const custom_object_type& lhs, const custom_object_type& rhs)
|
||||
{
|
||||
return lhs.data_ < rhs.data_;
|
||||
}
|
||||
};
|
||||
|
||||
```
|
||||
|
||||
??? example "Example: use the custom `ObjectType`"
|
||||
|
||||
```cpp
|
||||
--8<-- "examples/custom_object_type.cpp"
|
||||
#include <iostream>
|
||||
#include <type_traits>
|
||||
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
#include "custom_object_type.hpp"
|
||||
|
||||
using custom_json = nlohmann::json::with_object_t<custom_object_type>;
|
||||
|
||||
int main()
|
||||
{
|
||||
custom_json j;
|
||||
j["pi"] = 3.141;
|
||||
j["happy"] = true;
|
||||
j["list"] = {1, 2, 3};
|
||||
|
||||
std::cout << j.dump(2) << std::endl;
|
||||
std::cout << std::boolalpha << (custom_json::parse(j.dump()) == j) << std::endl;
|
||||
|
||||
// custom_object_type has no key_compare member, so object_comparator_t
|
||||
// falls back to its default
|
||||
std::cout << std::boolalpha
|
||||
<< std::is_same<custom_json::object_comparator_t, custom_json::default_object_comparator_t>::value
|
||||
<< std::endl;
|
||||
}
|
||||
|
||||
```
|
||||
|
||||
Output:
|
||||
|
||||
```json
|
||||
--8<-- "examples/custom_object_type.output"
|
||||
{
|
||||
"happy": true,
|
||||
"list": [
|
||||
1,
|
||||
2,
|
||||
3
|
||||
],
|
||||
"pi": 3.141
|
||||
}
|
||||
true
|
||||
true
|
||||
|
||||
```
|
||||
|
||||
### Compatible containers
|
||||
@@ -308,19 +488,191 @@ using array_t = ArrayType<basic_json, AllocatorType<basic_json>>;
|
||||
requirement above -- a good starting point for a custom `ArrayType`.
|
||||
|
||||
```cpp
|
||||
--8<-- "examples/custom_array_type.hpp"
|
||||
#pragma once
|
||||
|
||||
#include <memory>
|
||||
#include <utility>
|
||||
#include <vector>
|
||||
|
||||
// A minimal, self-contained ArrayType built around a private std::vector.
|
||||
// See https://json.nlohmann.me/features/types/template_parameters/#arraytype
|
||||
template<class T, class Allocator = std::allocator<T>>
|
||||
class custom_array_type
|
||||
{
|
||||
using vector_t = std::vector<T, Allocator>;
|
||||
vector_t data_;
|
||||
|
||||
public:
|
||||
using value_type = typename vector_t::value_type;
|
||||
using size_type = typename vector_t::size_type;
|
||||
using iterator = typename vector_t::iterator;
|
||||
using const_iterator = typename vector_t::const_iterator;
|
||||
|
||||
custom_array_type() = default;
|
||||
custom_array_type(const custom_array_type&) = default;
|
||||
custom_array_type(custom_array_type&&) = default;
|
||||
custom_array_type& operator=(const custom_array_type&) = default;
|
||||
custom_array_type& operator=(custom_array_type&&) = default;
|
||||
|
||||
template<class InputIt>
|
||||
custom_array_type(InputIt first, InputIt last) : data_(first, last) {}
|
||||
|
||||
custom_array_type(size_type count, const T& value) : data_(count, value) {}
|
||||
|
||||
iterator begin()
|
||||
{
|
||||
return data_.begin();
|
||||
}
|
||||
iterator end()
|
||||
{
|
||||
return data_.end();
|
||||
}
|
||||
const_iterator begin() const
|
||||
{
|
||||
return data_.begin();
|
||||
}
|
||||
const_iterator end() const
|
||||
{
|
||||
return data_.end();
|
||||
}
|
||||
const_iterator cbegin() const
|
||||
{
|
||||
return data_.cbegin();
|
||||
}
|
||||
const_iterator cend() const
|
||||
{
|
||||
return data_.cend();
|
||||
}
|
||||
|
||||
bool empty() const
|
||||
{
|
||||
return data_.empty();
|
||||
}
|
||||
size_type size() const
|
||||
{
|
||||
return data_.size();
|
||||
}
|
||||
size_type max_size() const
|
||||
{
|
||||
return data_.max_size();
|
||||
}
|
||||
void clear()
|
||||
{
|
||||
data_.clear();
|
||||
}
|
||||
void resize(size_type n)
|
||||
{
|
||||
data_.resize(n);
|
||||
}
|
||||
|
||||
T& operator[](size_type pos)
|
||||
{
|
||||
return data_[pos];
|
||||
}
|
||||
const T& operator[](size_type pos) const
|
||||
{
|
||||
return data_[pos];
|
||||
}
|
||||
|
||||
T& back()
|
||||
{
|
||||
return data_.back();
|
||||
}
|
||||
const T& back() const
|
||||
{
|
||||
return data_.back();
|
||||
}
|
||||
|
||||
void push_back(const T& value)
|
||||
{
|
||||
data_.push_back(value);
|
||||
}
|
||||
void push_back(T&& value)
|
||||
{
|
||||
data_.push_back(std::move(value));
|
||||
}
|
||||
|
||||
template<class... Args>
|
||||
void emplace_back(Args&& ... args)
|
||||
{
|
||||
data_.emplace_back(std::forward<Args>(args)...);
|
||||
}
|
||||
|
||||
void pop_back()
|
||||
{
|
||||
data_.pop_back();
|
||||
}
|
||||
|
||||
iterator insert(const_iterator pos, const T& value)
|
||||
{
|
||||
return data_.insert(pos, value);
|
||||
}
|
||||
iterator insert(const_iterator pos, size_type count, const T& value)
|
||||
{
|
||||
return data_.insert(pos, count, value);
|
||||
}
|
||||
template<class InputIt>
|
||||
iterator insert(const_iterator pos, InputIt first, InputIt last)
|
||||
{
|
||||
return data_.insert(pos, first, last);
|
||||
}
|
||||
|
||||
iterator erase(const_iterator pos)
|
||||
{
|
||||
return data_.erase(pos);
|
||||
}
|
||||
iterator erase(const_iterator first, const_iterator last)
|
||||
{
|
||||
return data_.erase(first, last);
|
||||
}
|
||||
|
||||
void swap(custom_array_type& other)
|
||||
{
|
||||
data_.swap(other.data_);
|
||||
}
|
||||
|
||||
friend bool operator==(const custom_array_type& lhs, const custom_array_type& rhs)
|
||||
{
|
||||
return lhs.data_ == rhs.data_;
|
||||
}
|
||||
friend bool operator<(const custom_array_type& lhs, const custom_array_type& rhs)
|
||||
{
|
||||
return lhs.data_ < rhs.data_;
|
||||
}
|
||||
};
|
||||
|
||||
```
|
||||
|
||||
??? example "Example: use the custom `ArrayType`"
|
||||
|
||||
```cpp
|
||||
--8<-- "examples/custom_array_type.cpp"
|
||||
#include <iostream>
|
||||
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
#include "custom_array_type.hpp"
|
||||
|
||||
using custom_json = nlohmann::json::with_array_t<custom_array_type>;
|
||||
|
||||
int main()
|
||||
{
|
||||
custom_json j = custom_json::array();
|
||||
j.push_back(1);
|
||||
j.push_back(2);
|
||||
j.push_back(3);
|
||||
|
||||
std::cout << j.dump() << std::endl;
|
||||
std::cout << std::boolalpha << (custom_json::parse(j.dump()) == j) << std::endl;
|
||||
}
|
||||
|
||||
```
|
||||
|
||||
Output:
|
||||
|
||||
```json
|
||||
--8<-- "examples/custom_array_type.output"
|
||||
[1,2,3]
|
||||
true
|
||||
|
||||
```
|
||||
|
||||
### Compatible containers
|
||||
@@ -451,19 +803,193 @@ using array_t = ArrayType<basic_json, AllocatorType<basic_json>>;
|
||||
of the API.
|
||||
|
||||
```cpp
|
||||
--8<-- "examples/custom_string_type.hpp"
|
||||
#pragma once
|
||||
|
||||
#include <cstddef>
|
||||
#include <ostream>
|
||||
#include <string>
|
||||
|
||||
// A minimal, self-contained StringType built around a private std::string.
|
||||
// Wraps rather than inherits, so it exposes exactly what the library needs
|
||||
// and nothing more of std::string's interface.
|
||||
//
|
||||
// Covers the "Always required" members, the extras needed for the binary
|
||||
// formats, JSON Pointer / flatten / unflatten, and the int_to_string overload
|
||||
// needed for diff and items. Extending it further (e.g. for
|
||||
// std::hash<basic_json> or to_bson) is a matter of adding the extra members
|
||||
// listed in the "Required for other functionality" table.
|
||||
//
|
||||
// See https://json.nlohmann.me/features/types/template_parameters/#stringtype
|
||||
class custom_string_type
|
||||
{
|
||||
std::string data_;
|
||||
|
||||
public:
|
||||
using value_type = char;
|
||||
using size_type = std::string::size_type;
|
||||
using iterator = std::string::iterator;
|
||||
using const_iterator = std::string::const_iterator;
|
||||
|
||||
static constexpr size_type npos = std::string::npos;
|
||||
|
||||
custom_string_type() = default;
|
||||
custom_string_type(const custom_string_type&) = default;
|
||||
custom_string_type(custom_string_type&&) = default;
|
||||
custom_string_type& operator=(const custom_string_type&) = default;
|
||||
custom_string_type& operator=(custom_string_type&&) = default;
|
||||
|
||||
// not explicit: the library relies on being able to hand it a string literal
|
||||
custom_string_type(const char* s) : data_(s) {}
|
||||
custom_string_type(const char* s, size_type count) : data_(s, count) {}
|
||||
custom_string_type(size_type count, char ch) : data_(count, ch) {}
|
||||
|
||||
size_type size() const
|
||||
{
|
||||
return data_.size();
|
||||
}
|
||||
bool empty() const
|
||||
{
|
||||
return data_.empty();
|
||||
}
|
||||
void clear()
|
||||
{
|
||||
data_.clear();
|
||||
}
|
||||
void resize(size_type n)
|
||||
{
|
||||
data_.resize(n);
|
||||
}
|
||||
void resize(size_type n, char c)
|
||||
{
|
||||
data_.resize(n, c);
|
||||
}
|
||||
void reserve(size_type n)
|
||||
{
|
||||
data_.reserve(n);
|
||||
}
|
||||
|
||||
// must stay null-terminated -- the parser hands this to std::strtoull &
|
||||
// friends; std::string::data() has guaranteed that since C++11
|
||||
const char* data() const
|
||||
{
|
||||
return data_.data();
|
||||
}
|
||||
|
||||
void push_back(char c)
|
||||
{
|
||||
data_.push_back(c);
|
||||
}
|
||||
|
||||
char& operator[](size_type pos)
|
||||
{
|
||||
return data_[pos];
|
||||
}
|
||||
char operator[](size_type pos) const
|
||||
{
|
||||
return data_[pos];
|
||||
}
|
||||
|
||||
custom_string_type& append(const char* s, size_type count)
|
||||
{
|
||||
data_.append(s, count);
|
||||
return *this;
|
||||
}
|
||||
custom_string_type& append(const custom_string_type& other)
|
||||
{
|
||||
data_.append(other.data_);
|
||||
return *this;
|
||||
}
|
||||
custom_string_type& operator+=(char c)
|
||||
{
|
||||
data_.push_back(c);
|
||||
return *this;
|
||||
}
|
||||
|
||||
size_type find_first_of(char c, size_type pos = 0) const
|
||||
{
|
||||
return data_.find_first_of(c, pos);
|
||||
}
|
||||
|
||||
iterator begin()
|
||||
{
|
||||
return data_.begin();
|
||||
}
|
||||
iterator end()
|
||||
{
|
||||
return data_.end();
|
||||
}
|
||||
const_iterator begin() const
|
||||
{
|
||||
return data_.begin();
|
||||
}
|
||||
const_iterator end() const
|
||||
{
|
||||
return data_.end();
|
||||
}
|
||||
|
||||
// found by ADL; converts array indices to keys in diff and items
|
||||
friend void int_to_string(custom_string_type& target, std::size_t value)
|
||||
{
|
||||
target.data_ = std::to_string(value);
|
||||
}
|
||||
|
||||
friend bool operator==(const custom_string_type& lhs, const custom_string_type& rhs)
|
||||
{
|
||||
return lhs.data_ == rhs.data_;
|
||||
}
|
||||
friend bool operator<(const custom_string_type& lhs, const custom_string_type& rhs)
|
||||
{
|
||||
return lhs.data_ < rhs.data_;
|
||||
}
|
||||
|
||||
// not required by the library itself, but dump() returns a custom_string_type
|
||||
// and this makes `std::cout << j.dump()` work as expected
|
||||
friend std::ostream& operator<<(std::ostream& os, const custom_string_type& s)
|
||||
{
|
||||
return os << s.data_;
|
||||
}
|
||||
};
|
||||
|
||||
```
|
||||
|
||||
??? example "Example: use the custom `StringType`"
|
||||
|
||||
```cpp
|
||||
--8<-- "examples/custom_string_type.cpp"
|
||||
#include <iostream>
|
||||
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
#include "custom_string_type.hpp"
|
||||
|
||||
using custom_json = nlohmann::json::with_string_t<custom_string_type>;
|
||||
|
||||
int main()
|
||||
{
|
||||
custom_json j;
|
||||
j["pi"] = 3.141;
|
||||
j["happy"] = true;
|
||||
j["list"] = {1, 2, 3};
|
||||
|
||||
std::cout << j.dump(2) << std::endl;
|
||||
std::cout << std::boolalpha << (custom_json::parse(j.dump()) == j) << std::endl;
|
||||
}
|
||||
|
||||
```
|
||||
|
||||
Output:
|
||||
|
||||
```json
|
||||
--8<-- "examples/custom_string_type.output"
|
||||
{
|
||||
"happy": true,
|
||||
"list": [
|
||||
1,
|
||||
2,
|
||||
3
|
||||
],
|
||||
"pi": 3.141
|
||||
}
|
||||
true
|
||||
|
||||
```
|
||||
|
||||
## `BooleanType`
|
||||
@@ -673,19 +1199,148 @@ such a container to a `basic_json` value.
|
||||
every requirement above -- a good starting point for a custom `BinaryType`.
|
||||
|
||||
```cpp
|
||||
--8<-- "examples/custom_binary_type.hpp"
|
||||
#pragma once
|
||||
|
||||
#include <cstdint>
|
||||
#include <initializer_list>
|
||||
#include <vector>
|
||||
|
||||
// A minimal, self-contained BinaryType built around a private std::vector.
|
||||
// See https://json.nlohmann.me/features/types/template_parameters/#binarytype
|
||||
class custom_binary_type
|
||||
{
|
||||
using vector_t = std::vector<std::uint8_t>;
|
||||
vector_t data_;
|
||||
|
||||
public:
|
||||
using value_type = vector_t::value_type;
|
||||
using size_type = vector_t::size_type;
|
||||
using iterator = vector_t::iterator;
|
||||
using const_iterator = vector_t::const_iterator;
|
||||
|
||||
custom_binary_type() = default;
|
||||
custom_binary_type(const custom_binary_type&) = default;
|
||||
custom_binary_type(custom_binary_type&&) = default;
|
||||
custom_binary_type& operator=(const custom_binary_type&) = default;
|
||||
custom_binary_type& operator=(custom_binary_type&&) = default;
|
||||
|
||||
template<class InputIt>
|
||||
custom_binary_type(InputIt first, InputIt last) : data_(first, last) {}
|
||||
|
||||
// so basic_json::binary({0x01, 0x02}) can build one directly
|
||||
custom_binary_type(std::initializer_list<std::uint8_t> init) : data_(init) {}
|
||||
|
||||
size_type size() const
|
||||
{
|
||||
return data_.size();
|
||||
}
|
||||
bool empty() const
|
||||
{
|
||||
return data_.empty();
|
||||
}
|
||||
void clear()
|
||||
{
|
||||
data_.clear();
|
||||
}
|
||||
void resize(size_type n)
|
||||
{
|
||||
data_.resize(n);
|
||||
}
|
||||
|
||||
// read-only is enough: the writers only ever read from a binary value
|
||||
const std::uint8_t* data() const
|
||||
{
|
||||
return data_.data();
|
||||
}
|
||||
|
||||
std::uint8_t& operator[](size_type pos)
|
||||
{
|
||||
return data_[pos];
|
||||
}
|
||||
std::uint8_t operator[](size_type pos) const
|
||||
{
|
||||
return data_[pos];
|
||||
}
|
||||
|
||||
std::uint8_t& back()
|
||||
{
|
||||
return data_.back();
|
||||
}
|
||||
std::uint8_t back() const
|
||||
{
|
||||
return data_.back();
|
||||
}
|
||||
|
||||
iterator begin()
|
||||
{
|
||||
return data_.begin();
|
||||
}
|
||||
iterator end()
|
||||
{
|
||||
return data_.end();
|
||||
}
|
||||
const_iterator begin() const
|
||||
{
|
||||
return data_.begin();
|
||||
}
|
||||
const_iterator end() const
|
||||
{
|
||||
return data_.end();
|
||||
}
|
||||
const_iterator cbegin() const
|
||||
{
|
||||
return data_.cbegin();
|
||||
}
|
||||
const_iterator cend() const
|
||||
{
|
||||
return data_.cend();
|
||||
}
|
||||
|
||||
template<class InputIt>
|
||||
iterator insert(const_iterator pos, InputIt first, InputIt last)
|
||||
{
|
||||
return data_.insert(pos, first, last);
|
||||
}
|
||||
|
||||
friend bool operator==(const custom_binary_type& lhs, const custom_binary_type& rhs)
|
||||
{
|
||||
return lhs.data_ == rhs.data_;
|
||||
}
|
||||
friend bool operator<(const custom_binary_type& lhs, const custom_binary_type& rhs)
|
||||
{
|
||||
return lhs.data_ < rhs.data_;
|
||||
}
|
||||
};
|
||||
|
||||
```
|
||||
|
||||
??? example "Example: use the custom `BinaryType`"
|
||||
|
||||
```cpp
|
||||
--8<-- "examples/custom_binary_type.cpp"
|
||||
#include <iostream>
|
||||
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
#include "custom_binary_type.hpp"
|
||||
|
||||
using custom_json = nlohmann::json::with_binary_t<custom_binary_type>;
|
||||
|
||||
int main()
|
||||
{
|
||||
const auto j = custom_json::binary({0x01, 0x02, 0x03});
|
||||
|
||||
std::cout << j.dump() << std::endl;
|
||||
std::cout << std::boolalpha << (custom_json::from_cbor(custom_json::to_cbor(j)) == j) << std::endl;
|
||||
}
|
||||
|
||||
```
|
||||
|
||||
Output:
|
||||
|
||||
```json
|
||||
--8<-- "examples/custom_binary_type.output"
|
||||
{"bytes":[1,2,3],"subtype":null}
|
||||
true
|
||||
|
||||
```
|
||||
|
||||
### Compatible containers
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/features/types/template_parameters/" rel="canonical"><link href=../number_handling/ rel=prev><link href=../../../integration/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Template Parameter Requirements - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new 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data-md-component=logo> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Template Parameter Requirements </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo 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6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 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|
||||
<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/features/types/template_parameters/" rel="canonical"><link href=../number_handling/ rel=prev><link href=../../../integration/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Template Parameter Requirements - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><script>__md_scope=new URL("../../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#template-parameter-requirements class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Template Parameter Requirements </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio name=__palette id=__palette_0> <label class="md-header__button md-icon" title="Switch to dark mode" for=__palette_1 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a4 4 0 0 0-4 4 4 4 0 0 0 4 4 4 4 0 0 0 4-4 4 4 0 0 0-4-4m0 10a6 6 0 0 1-6-6 6 6 0 0 1 6-6 6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> <input class=md-option data-md-color-media="(prefers-color-scheme: dark)" data-md-color-scheme=slate data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to light mode" type=radio name=__palette id=__palette_1> <label class="md-header__button md-icon" title="Switch to light mode" for=__palette_0 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 18c-.89 0-1.74-.2-2.5-.55C11.56 16.5 13 14.42 13 12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 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|
||||
<span class=w> </span><span class=n>basic_json</span><span class=p>,</span><span class=w> </span><span class=c1>// mapped_type</span>
|
||||
<span class=w> </span><span class=n>default_object_comparator_t</span><span class=p>,</span><span class=w> </span><span class=c1>// key_compare</span>
|
||||
<span class=w> </span><span class=n>AllocatorType</span><span class=o><</span><span class=n>std</span><span class=o>::</span><span class=n>pair</span><span class=o><</span><span class=k>const</span><span class=w> </span><span class=n>StringType</span><span class=p>,</span>
|
||||
@@ -374,7 +374,7 @@
|
||||
<span class=p>}</span>
|
||||
</code></pre></div> <p>Output:</p> <div class=highlight><pre><span></span><code><span class=p>[</span><span class=mi>1</span><span class=p>,</span><span class=mi>2</span><span class=p>,</span><span class=mi>3</span><span class=p>]</span>
|
||||
<span class=kc>true</span>
|
||||
</code></pre></div> </details> <h3 id=compatible-containers_1>Compatible containers<a class=headerlink href=#compatible-containers_1 title="Permanent link">¶</a></h3> <table> <thead> <tr> <th>Container</th> <th>Notes</th> </tr> </thead> <tbody> <tr> <td><code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>vector</span></code> (default)</td> <td></td> </tr> <tr> <td><code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>deque</span></code></td> <td>references survive appends, but not insertions elsewhere; see the <code>capacity()</code> note above</td> </tr> <tr> <td><code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>pmr</span><span class=o>::</span><span class=n>vector</span></code></td> <td>through an alias, as the allocator comes from <code>AllocatorType</code> instead</td> </tr> <tr> <td><code>boost::container::vector</code>, <code>deque</code>, <code>devector</code></td> <td></td> </tr> <tr> <td><code>boost::container::stable_vector</code></td> <td>the only one tried that keeps references valid across <em>every</em> insertion</td> </tr> <tr> <td><code>boost::container::small_vector</code>, <code>folly::small_vector</code></td> <td>through an alias that fixes the inline capacity</td> </tr> <tr> <td><code>boost::container::static_vector</code></td> <td>through the same kind of alias, for arrays that stay within the fixed capacity</td> </tr> <tr> <td><code>folly::fbvector</code></td> <td>requires C++20, see the note above</td> </tr> </tbody> </table> <h3 id=containers-that-cannot-be-used_1>Containers that cannot be used<a class=headerlink href=#containers-that-cannot-be-used_1 title="Permanent link">¶</a></h3> <table> <thead> <tr> <th>Container</th> <th>Reason</th> </tr> </thead> <tbody> <tr> <td><code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>list</span></code></td> <td>no <code>operator[]</code>, and no random-access iterators</td> </tr> <tr> <td><code>eastl::vector</code>, <code>QList</code>, <code>QVector</code></td> <td>no <code>max_size()</code>; they handle the incomplete value type fine</td> </tr> <tr> <td><code>absl::InlinedVector</code></td> <td>requires a complete value type, see the note above</td> </tr> <tr> <td><code>absl::FixedArray</code></td> <td>the size is fixed at construction, so <code>resize</code>, <code>push_back</code>, <code>insert</code> and <code>erase</code> are missing</td> </tr> </tbody> </table> <h2 id=stringtype><code>StringType</code><a class=headerlink href=#stringtype title="Permanent link">¶</a></h2> <p><code>StringType</code> is used <strong>both</strong> for <abbr title="JavaScript Object Notation">JSON</abbr> string values and for the keys of <abbr title="JavaScript Object Notation">JSON</abbr> objects (<code>string_t</code> and <code>object_t::key_type</code>).</p> <h3 id=always-required_2>Always required<a class=headerlink href=#always-required_2 title="Permanent link">¶</a></h3> <ul> <li>A member type <code>value_type</code> that is one byte wide and <code>char</code>-compatible. The library stores and processes <abbr title="Unicode Transformation Format">UTF</abbr>-8 encoded <code>char</code> data and passes <code>data()</code> to functions that take a <code class=highlight><span class=k>const</span><span class=w> </span><span class=kt>char</span><span class=o>*</span></code>, such as <code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>strtod</span></code>. <code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>wstring</span></code>, <code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>u16string</span></code>, and <code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>u32string</span></code> are <strong>not</strong> valid choices; see the <abbr title="Frequently Asked Questions">FAQ</abbr> on <a href=../../../home/faq/#wide-string-handling>wide string handling</a>.</li> <li>Constructors: default, copy, move, from <code class=highlight><span class=k>const</span><span class=w> </span><span class=kt>char</span><span class=o>*</span></code> (which must not be <code class=highlight><span class=k>explicit</span></code>), from <code class=highlight><span class=p>(</span><span class=k>const</span><span class=w> </span><span class=kt>char</span><span class=o>*</span><span class=p>,</span><span class=w> </span><span class=n>size_type</span><span class=p>)</span></code>, and from <code class=highlight><span class=p>(</span><span class=n>size_type</span><span class=p>,</span><span class=w> </span><span class=kt>char</span><span class=p>)</span></code>; and copy or move assignment.</li> <li>Member functions <code>size()</code>, <code>clear()</code>, <code>resize(n, c)</code>, <code>data()</code>, <code>push_back(char)</code>, and <code>operator[]</code> (const and non-const, returning references). <code>c_str()</code>Line truncated
|
||||
</code></pre></div> </details> <h3 id=compatible-containers_1>Compatible containers<a class=headerlink href=#compatible-containers_1 title="Permanent link">¶</a></h3> <table> <thead> <tr> <th>Container</th> <th>Notes</th> </tr> </thead> <tbody> <tr> <td><code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>vector</span></code> (default)</td> <td></td> </tr> <tr> <td><code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>deque</span></code></td> <td>references survive appends, but not insertions elsewhere; see the <code>capacity()</code> note above</td> </tr> <tr> <td><code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>pmr</span><span class=o>::</span><span class=n>vector</span></code></td> <td>through an alias, as the allocator comes from <code>AllocatorType</code> instead</td> </tr> <tr> <td><code>boost::container::vector</code>, <code>deque</code>, <code>devector</code></td> <td></td> </tr> <tr> <td><code>boost::container::stable_vector</code></td> <td>the only one tried that keeps references valid across <em>every</em> insertion</td> </tr> <tr> <td><code>boost::container::small_vector</code>, <code>folly::small_vector</code></td> <td>through an alias that fixes the inline capacity</td> </tr> <tr> <td><code>boost::container::static_vector</code></td> <td>through the same kind of alias, for arrays that stay within the fixed capacity</td> </tr> <tr> <td><code>folly::fbvector</code></td> <td>requires C++20, see the note above</td> </tr> </tbody> </table> <h3 id=containers-that-cannot-be-used_1>Containers that cannot be used<a class=headerlink href=#containers-that-cannot-be-used_1 title="Permanent link">¶</a></h3> <table> <thead> <tr> <th>Container</th> <th>Reason</th> </tr> </thead> <tbody> <tr> <td><code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>list</span></code></td> <td>no <code>operator[]</code>, and no random-access iterators</td> </tr> <tr> <td><code>eastl::vector</code>, <code>QList</code>, <code>QVector</code></td> <td>no <code>max_size()</code>; they handle the incomplete value type fine</td> </tr> <tr> <td><code>absl::InlinedVector</code></td> <td>requires a complete value type, see the note above</td> </tr> <tr> <td><code>absl::FixedArray</code></td> <td>the size is fixed at construction, so <code>resize</code>, <code>push_back</code>, <code>insert</code> and <code>erase</code> are missing</td> </tr> </tbody> </table> <h2 id=stringtype><code>StringType</code><a class=headerlink href=#stringtype title="Permanent link">¶</a></h2> <p><code>StringType</code> is used <strong>both</strong> for <abbr title="JavaScript Object Notation">JSON</abbr> string values and for the keys of <abbr title="JavaScript Object Notation">JSON</abbr> objects (<code>string_t</code> and <code>object_t::key_type</code>).</p> <h3 id=always-required_2>Always required<a class=headerlink href=#always-required_2 title="Permanent link">¶</a></h3> <ul> <li>A member type <code>value_type</code> that is one byte wide and <code>char</code>-compatible. The library stores and processes <abbr title="Unicode Transformation Format">UTF</abbr>-8 encoded <code>char</code> data and passes <code>data()</code> to functions that take a <code class=highlight><span class=k>const</span><span class=w> </span><span class=kt>char</span><span class=o>*</span></code>, such as <code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>strtod</span></code>. <code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>wstring</span></code>, <code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>u16string</span></code>, and <code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>u32string</span></code> are <strong>not</strong> valid choices; see the <abbr title="Frequently Asked Questions">FAQ</abbr> on <a href=../../../home/faq/#wide-string-handling>wide string handling</a>.</li> <li>Constructors: default, copy, move, from <code class=highlight><span class=k>const</span><span class=w> </span><span class=kt>char</span><span class=o>*</span></code> (which must not be <code class=highlight><span class=k>explicit</span></code>), from <code class=highlight><span class=p>(</span><span class=k>const</span><span class=w> </span><span class=kt>char</span><span class=o>*</span><span class=p>,</span><span class=w> </span><span class=n>size_type</span><span class=p>)</span></code>, and from <code class=highlight><span class=p>(</span><span class=n>size_type</span><span class=p>,</span><span class=w> </span><span class=kt>char</span><span class=p>)</span></code>; and copy or move assignment.</li> <li>Member functions <code>size()</code>, <code>clear()</code>, <code>resize(n, c)</code>, <code>data()</code>, <code>push_back(char)</code>, and <code>operator[]</code> (const and non-const, returning references). <code>c_str()</code>Line truncated
|
||||
|
||||
<span class=cp>#include</span><span class=w> </span><span class=cpf><cstddef></span>
|
||||
<span class=cp>#include</span><span class=w> </span><span class=cpf><ostream></span>
|
||||
@@ -678,4 +678,4 @@
|
||||
<span class=p>}</span>
|
||||
</code></pre></div> <p>Output:</p> <div class=highlight><pre><span></span><code><span class=p>{</span><span class=nt>"bytes"</span><span class=p>:[</span><span class=mi>1</span><span class=p>,</span><span class=mi>2</span><span class=p>,</span><span class=mi>3</span><span class=p>],</span><span class=nt>"subtype"</span><span class=p>:</span><span class=kc>null</span><span class=p>}</span>
|
||||
<span class=kc>true</span>
|
||||
</code></pre></div> </details> <h3 id=compatible-containers_2>Compatible containers<a class=headerlink href=#compatible-containers_2 title="Permanent link">¶</a></h3> <table> <thead> <tr> <th>Container</th> <th>Notes</th> </tr> </thead> <tbody> <tr> <td><code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>vector</span><span class=o><</span><span class=n>std</span><span class=o>::</span><span class=kt>uint8_t</span><span class=o>></span></code> (default)</td> <td></td> </tr> <tr> <td><code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>vector</span><span class=o><</span><span class=kt>char</span><span class=o>></span></code>, <code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>vector</span><span class=o><</span><span class=n>std</span><span class=o>::</span><span class=kt>byte</span><span class=o>></span></code></td> <td><code>dump()</code> writes the bytes as 0..255 whichever is used</td> </tr> <tr> <td><code>boost::container::vector<std::uint8_t></code>, <code>boost::container::small_vector<std::uint8_t, N></code></td> <td></td> </tr> <tr> <td><code>absl::InlinedVector<std::uint8_t, N></code></td> <td>usable here, unlike as an <code>ArrayType</code>, because the value type is complete</td> </tr> <tr> <td><code>eastl::vector<std::uint8_t></code></td> <td>usable here, unlike as an <code>ArrayType</code>, because <code>max_size()</code> is not needed</td> </tr> <tr> <td><code>folly::fbvector<std::uint8_t></code></td> <td>requires C++20, see the note above</td> </tr> </tbody> </table> <h3 id=containers-that-cannot-be-used_2>Containers that cannot be used<a class=headerlink href=#containers-that-cannot-be-used_2 title="Permanent link">¶</a></h3> <table> <thead> <tr> <th>Container</th> <th>Reason</th> </tr> </thead> <tbody> <tr> <td><code>QByteArray</code></td> <td>no <code>empty()</code> (it spells that <code>isEmpty()</code>); its <code>insert</code> takes an index rather than an iterator; and it converts to <code>string_t</code>, which makes <code>to_json</code> ambiguous between a string and a binary value</td> </tr> <tr> <td><code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>string</span></code></td> <td><code>binary_t::container_type</code> and <code>string_t</code> would be the same type, so the two <a href=../../../api/basic_json/swap/ ><code>swap</code></a> overloads collide and <code>basic_json</code> cannot be instantiated at all</td> </tr> <tr> <td><code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>deque</span><span class=o><</span><span class=n>std</span><span class=o>::</span><span class=kt>uint8_t</span><span class=o>></span></code></td> <td>storage is not contiguous, so there is no <code>data()</code></td> </tr> <tr> <td>containers whose <code>value_type</code> is wider than one byte</td> <td>see above -- accepted by the compiler, wrong at runtime</td> </tr> </tbody> </table> <h2 id=custombaseclass><code>CustomBaseClass</code><a class=headerlink href=#custombaseclass title="Permanent link">¶</a></h2> <p><code>CustomBaseClass</code> is an extension point: unless it is <code class=highlight><span class=kt>void</span></code> (the default, which selects the empty <code>nlohmann::json_default_base</code>), <code>basic_json</code> publicly derives from it.</p> <h3 id=always-required_9>Always required<a class=headerlink href=#always-required_9 title="Permanent link">¶</a></h3> <ul> <li>A non-<code>final</code>, default-constructible class type.</li> <li><code>basic_json</code> is copy-/move-constructible and copy-/move-assignable only if <code>CustomBaseClass</code> is.</li> </ul> <h3 id=notes_2>Notes<a class=headerlink href=#notes_2 title="Permanent link">¶</a></h3> <p><code>basic_json</code> is documented to be a <a href="https://en.cppreference.com/w/cpp/named_req/StandardLayoutType">StandardLayoutType</a>. Because <code>basic_json</code> has non-static data members of its own, a <code>CustomBaseClass</code> with non-static data members forfeits this guarantee.</p> <p>Note the namespace of <code>CustomBaseClass</code> becomes an associated namespace of <code>basic_json</code> for the purpose of argument-dependent lookup.</p> <p>See <a href=../../../api/basic_json/json_base_class_t/ ><code>json_base_class_t</code></a> for an example.</p> <h3 id=compatible-types_6>Compatible types<a class=headerlink href=#compatible-types_6 title="Permanent link">¶</a></h3> <table> <thead> <tr> <th>Type</th> <th>Support</th> </tr> </thead> <tbody> <tr> <td><code class=highlight><span class=kt>void</span></code> (default)</td> <td>an empty base class is used; no effect on <code>basic_json</code></td> </tr> <tr> <td>any default-constructible, non-<code>final</code> class</td> <td>full; see <a href=../../../api/basic_json/json_base_class_t/ ><code>json_base_class_t</code></a></td> </tr>Line truncated
|
||||
</code></pre></div> </details> <h3 id=compatible-containers_2>Compatible containers<a class=headerlink href=#compatible-containers_2 title="Permanent link">¶</a></h3> <table> <thead> <tr> <th>Container</th> <th>Notes</th> </tr> </thead> <tbody> <tr> <td><code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>vector</span><span class=o><</span><span class=n>std</span><span class=o>::</span><span class=kt>uint8_t</span><span class=o>></span></code> (default)</td> <td></td> </tr> <tr> <td><code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>vector</span><span class=o><</span><span class=kt>char</span><span class=o>></span></code>, <code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>vector</span><span class=o><</span><span class=n>std</span><span class=o>::</span><span class=kt>byte</span><span class=o>></span></code></td> <td><code>dump()</code> writes the bytes as 0..255 whichever is used</td> </tr> <tr> <td><code>boost::container::vector<std::uint8_t></code>, <code>boost::container::small_vector<std::uint8_t, N></code></td> <td></td> </tr> <tr> <td><code>absl::InlinedVector<std::uint8_t, N></code></td> <td>usable here, unlike as an <code>ArrayType</code>, because the value type is complete</td> </tr> <tr> <td><code>eastl::vector<std::uint8_t></code></td> <td>usable here, unlike as an <code>ArrayType</code>, because <code>max_size()</code> is not needed</td> </tr> <tr> <td><code>folly::fbvector<std::uint8_t></code></td> <td>requires C++20, see the note above</td> </tr> </tbody> </table> <h3 id=containers-that-cannot-be-used_2>Containers that cannot be used<a class=headerlink href=#containers-that-cannot-be-used_2 title="Permanent link">¶</a></h3> <table> <thead> <tr> <th>Container</th> <th>Reason</th> </tr> </thead> <tbody> <tr> <td><code>QByteArray</code></td> <td>no <code>empty()</code> (it spells that <code>isEmpty()</code>); its <code>insert</code> takes an index rather than an iterator; and it converts to <code>string_t</code>, which makes <code>to_json</code> ambiguous between a string and a binary value</td> </tr> <tr> <td><code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>string</span></code></td> <td><code>binary_t::container_type</code> and <code>string_t</code> would be the same type, so the two <a href=../../../api/basic_json/swap/ ><code>swap</code></a> overloads collide and <code>basic_json</code> cannot be instantiated at all</td> </tr> <tr> <td><code class=highlight><span class=n>std</span><span class=o>::</span><span class=n>deque</span><span class=o><</span><span class=n>std</span><span class=o>::</span><span class=kt>uint8_t</span><span class=o>></span></code></td> <td>storage is not contiguous, so there is no <code>data()</code></td> </tr> <tr> <td>containers whose <code>value_type</code> is wider than one byte</td> <td>see above -- accepted by the compiler, wrong at runtime</td> </tr> </tbody> </table> <h2 id=custombaseclass><code>CustomBaseClass</code><a class=headerlink href=#custombaseclass title="Permanent link">¶</a></h2> <p><code>CustomBaseClass</code> is an extension point: unless it is <code class=highlight><span class=kt>void</span></code> (the default, which selects the empty <code>nlohmann::json_default_base</code>), <code>basic_json</code> publicly derives from it.</p> <h3 id=always-required_9>Always required<a class=headerlink href=#always-required_9 title="Permanent link">¶</a></h3> <ul> <li>A non-<code>final</code>, default-constructible class type.</li> <li><code>basic_json</code> is copy-/move-constructible and copy-/move-assignable only if <code>CustomBaseClass</code> is.</li> </ul> <h3 id=notes_2>Notes<a class=headerlink href=#notes_2 title="Permanent link">¶</a></h3> <p><code>basic_json</code> is documented to be a <a href="https://en.cppreference.com/w/cpp/named_req/StandardLayoutType">StandardLayoutType</a>. Because <code>basic_json</code> has non-static data members of its own, a <code>CustomBaseClass</code> with non-static data members forfeits this guarantee.</p> <p>Note the namespace of <code>CustomBaseClass</code> becomes an associated namespace of <code>basic_json</code> for the purpose of argument-dependent lookup.</p> <p>See <a href=../../../api/basic_json/json_base_class_t/ ><code>json_base_class_t</code></a> for an example.</p> <h3 id=compatible-types_6>Compatible types<a class=headerlink href=#compatible-types_6 title="Permanent link">¶</a></h3> <table> <thead> <tr> <th>Type</th> <th>Support</th> </tr> </thead> <tbody> <tr> <td><code class=highlight><span class=kt>void</span></code> (default)</td> <td>an empty base class is used; no effect on <code>basic_json</code></td> </tr> <tr> <td>any default-constructible, non-<code>final</code> class</td> <td>full; see <a href=../../../api/basic_json/json_base_class_t/ ><code>json_base_class_t</code></a></td> </tr>Line truncated
|
||||
Reference in new issue
Block a user