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@@ -54,4 +54,4 @@
|
||||
<span class=p>{</span>
|
||||
<span class=w> </span><span class=n>j</span><span class=p>[</span><span class=s>"age"</span><span class=p>]</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>p</span><span class=p>.</span><span class=n>age</span><span class=p>;</span>
|
||||
<span class=p>}</span>
|
||||
</code></pre></div> </div> </div> </div> <h2 id=do-not-use-the-details-namespace>Do not use the <code>details</code> namespace<a class=headerlink href=#do-not-use-the-details-namespace title="Permanent link">¶</a></h2> <p>The <code>details</code> namespace is not part of the public <abbr title="Application Programming Interfaces">API</abbr> of the library and can change in any version without an announcement. Do not rely on any function or type in the <code>details</code> namespace.</p> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="July 4, 2026 09:13:25 UTC">July 4, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright © 2013-2026 Niels Lohmann </div> </div> <div class=md-social> <a href="https://github.com/nlohmann" target="_blank" rel="noopener" title="github.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 512 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M173.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6m-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3m44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9M252.8 8C114.1 8 8 113.3 8 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67.9 20.9-6.5 69 27 69 27 20-5.6 41.5-8.5 62.8-8.5s42.8 2.9 62.8 8.5c0 0 48.1-33.6 69-27 13.7 34.7 5.2 61.4 2.6 67.9 16 17.7 25.8 31.5 25.8 58.9 0 96.5-58.9 104.2-114.8 110.5 9.2 7.9 17 22.9 17 46.4 0 33.7-.3 75.4-.3 83.6 0 6.5 4.6 14.4 17.3 12.1C436.2 457.8 504 362.9 504 252 504 113.3 391.5 8 252.8 8M105.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1m-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7m32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1m-11.4-14.7c-1.6 1-1.6 3.6 0 5.9s4.3 3.3 5.6 2.3c1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2"/></svg> </a> <a href="https://www.linkedin.com/in/nielslohmann/" target="_blank" rel="noopener" title="www.linkedin.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 448 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M416 32H31.9C14.3 32 0 46.5 0 64.3v383.4C0 465.5 14.3 480 31.9 480H416c17.6 0 32-14.5 32-32.3V64.3c0-17.8-14.4-32.3-32-32.3M135.4 416H69V202.2h66.5V416zM102.2 96a38.5 38.5 0 1 1 0 77 38.5 38.5 0 1 1 0-77m282.1 320h-66.4V312c0-24.8-.5-56.7-34.5-56.7-34.6 0-39.9 27-39.9 54.9V416h-66.4V202.2h63.7v29.2h.9c8.9-16.8 30.6-34.5 62.9-34.5 67.2 0 79.7 44.3 79.7 101.9z"/></svg> </a> <a href="https://www.xing.com/profile/Niels_Lohmann" target="_blank" rel="noopener" title="www.xing.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 384 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fonLine truncated
|
||||
</code></pre></div> </div> </div> </div> <h2 id=do-not-use-the-details-namespace>Do not use the <code>details</code> namespace<a class=headerlink href=#do-not-use-the-details-namespace title="Permanent link">¶</a></h2> <p>The <code>details</code> namespace is not part of the public <abbr title="Application Programming Interfaces">API</abbr> of the library and can change in any version without an announcement. Do not rely on any function or type in the <code>details</code> namespace.</p> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="July 8, 2026 18:18:24 UTC">July 8, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright © 2013-2026 Niels Lohmann </div> </div> <div class=md-social> <a href="https://github.com/nlohmann" target="_blank" rel="noopener" title="github.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 512 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M173.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6m-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3m44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9M252.8 8C114.1 8 8 113.3 8 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67.9 20.9-6.5 69 27 69 27 20-5.6 41.5-8.5 62.8-8.5s42.8 2.9 62.8 8.5c0 0 48.1-33.6 69-27 13.7 34.7 5.2 61.4 2.6 67.9 16 17.7 25.8 31.5 25.8 58.9 0 96.5-58.9 104.2-114.8 110.5 9.2 7.9 17 22.9 17 46.4 0 33.7-.3 75.4-.3 83.6 0 6.5 4.6 14.4 17.3 12.1C436.2 457.8 504 362.9 504 252 504 113.3 391.5 8 252.8 8M105.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1m-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7m32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1m-11.4-14.7c-1.6 1-1.6 3.6 0 5.9s4.3 3.3 5.6 2.3c1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2"/></svg> </a> <a href="https://www.linkedin.com/in/nielslohmann/" target="_blank" rel="noopener" title="www.linkedin.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 448 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M416 32H31.9C14.3 32 0 46.5 0 64.3v383.4C0 465.5 14.3 480 31.9 480H416c17.6 0 32-14.5 32-32.3V64.3c0-17.8-14.4-32.3-32-32.3M135.4 416H69V202.2h66.5V416zM102.2 96a38.5 38.5 0 1 1 0 77 38.5 38.5 0 1 1 0-77m282.1 320h-66.4V312c0-24.8-.5-56.7-34.5-56.7-34.6 0-39.9 27-39.9 54.9V416h-66.4V202.2h63.7v29.2h.9c8.9-16.8 30.6-34.5 62.9-34.5 67.2 0 79.7 44.3 79.7 101.9z"/></svg> </a> <a href="https://www.xing.com/profile/Niels_Lohmann" target="_blank" rel="noopener" title="www.xing.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 384 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - https://fonLine truncated
|
||||
@@ -0,0 +1,179 @@
|
||||
# Migration Guide
|
||||
|
||||
This page collects some guidelines on how to future-proof your code for future versions of this library.
|
||||
|
||||
## Replace deprecated functions
|
||||
|
||||
The following functions have been deprecated and will be removed in the next major version (i.e., 4.0.0). All deprecations are annotated with [`HEDLEY_DEPRECATED_FOR`](https://nemequ.github.io/hedley/api-reference.html#HEDLEY_DEPRECATED_FOR) to report which function to use instead.
|
||||
|
||||
#### Parsing
|
||||
|
||||
- Function `friend std::istream& operator<<(basic_json&, std::istream&)` is deprecated since 3.0.0. Please use [`friend std::istream& operator>>(std::istream&, basic_json&)`](https://json.nlohmann.me/api/operator_gtgt/index.md) instead.
|
||||
|
||||
```
|
||||
nlohmann::json j;
|
||||
std::stringstream ss("[1,2,3]");
|
||||
j << ss;
|
||||
```
|
||||
|
||||
```
|
||||
nlohmann::json j;
|
||||
std::stringstream ss("[1,2,3]");
|
||||
ss >> j;
|
||||
```
|
||||
|
||||
- Passing iterator pairs or pointer/length pairs to parsing functions ([`parse`](https://json.nlohmann.me/api/basic_json/parse/index.md), [`accept`](https://json.nlohmann.me/api/basic_json/accept/index.md), [`sax_parse`](https://json.nlohmann.me/api/basic_json/sax_parse/index.md), [`from_cbor`](https://json.nlohmann.me/api/basic_json/from_cbor/index.md), [`from_msgpack`](https://json.nlohmann.me/api/basic_json/from_msgpack/index.md), [`from_ubjson`](https://json.nlohmann.me/api/basic_json/from_ubjson/index.md), and [`from_bson`](https://json.nlohmann.me/api/basic_json/from_bson/index.md) via initializer lists is deprecated since 3.8.0. Instead, pass two iterators; for instance, call `from_cbor(ptr, ptr+len)` instead of `from_cbor({ptr, len})`.
|
||||
|
||||
```
|
||||
const char* s = "[1,2,3]";
|
||||
bool ok = nlohmann::json::accept({s, s + std::strlen(s)});
|
||||
```
|
||||
|
||||
```
|
||||
const char* s = "[1,2,3]";
|
||||
bool ok = nlohmann::json::accept(s, s + std::strlen(s));
|
||||
```
|
||||
|
||||
#### JSON Pointers
|
||||
|
||||
- Comparing JSON Pointers with strings via [`operator==`](https://json.nlohmann.me/api/json_pointer/operator_eq/index.md) and [`operator!=`](https://json.nlohmann.me/api/json_pointer/operator_ne/index.md) is deprecated since 3.11.2. To compare a [`json_pointer`](https://json.nlohmann.me/api/json_pointer/index.md) `p` with a string `s`, convert `s` to a `json_pointer` first and use [`json_pointer::operator==`](https://json.nlohmann.me/api/json_pointer/operator_eq/index.md) or [`json_pointer::operator!=`](https://json.nlohmann.me/api/json_pointer/operator_ne/index.md).
|
||||
|
||||
```
|
||||
nlohmann::json::json_pointer lhs("/foo/bar/1");
|
||||
assert(lhs == "/foo/bar/1");
|
||||
```
|
||||
|
||||
```
|
||||
nlohmann::json::json_pointer lhs("/foo/bar/1");
|
||||
assert(lhs == nlohmann::json::json_pointer("/foo/bar/1"));
|
||||
```
|
||||
|
||||
- The implicit conversion from JSON Pointers to string ([`json_pointer::operator string_t`](https://json.nlohmann.me/api/json_pointer/operator_string_t/index.md)) is deprecated since 3.11.0. Use [`json_pointer::to_string`](https://json.nlohmann.me/api/json_pointer/to_string/index.md) instead.
|
||||
|
||||
```
|
||||
nlohmann::json::json_pointer ptr("/foo/bar/1");
|
||||
std::string s = ptr;
|
||||
```
|
||||
|
||||
```
|
||||
nlohmann::json::json_pointer ptr("/foo/bar/1");
|
||||
std::string s = ptr.to_string();
|
||||
```
|
||||
|
||||
- Passing a `basic_json` specialization as template parameter `RefStringType` to [`json_pointer`](https://json.nlohmann.me/api/json_pointer/index.md) is deprecated since 3.11.0. The string type can now be directly provided.
|
||||
|
||||
```
|
||||
using my_json = nlohmann::basic_json<std::map, std::vector, my_string_type>;
|
||||
nlohmann::json_pointer<my_json> ptr("/foo/bar/1");
|
||||
```
|
||||
|
||||
```
|
||||
nlohmann::json_pointer<my_string_type> ptr("/foo/bar/1");
|
||||
```
|
||||
|
||||
Thereby, `nlohmann::my_json::json_pointer` is an alias for `nlohmann::json_pointer<my_string_type>` and is always an alias to the `json_pointer` with the appropriate string type for all specializations of `basic_json`.
|
||||
|
||||
#### Miscellaneous functions
|
||||
|
||||
- The function `iterator_wrapper` is deprecated since 3.1.0. Please use the member function [`items`](https://json.nlohmann.me/api/basic_json/items/index.md) instead.
|
||||
|
||||
```
|
||||
for (auto &x : nlohmann::json::iterator_wrapper(j))
|
||||
{
|
||||
std::cout << x.key() << ":" << x.value() << std::endl;
|
||||
}
|
||||
```
|
||||
|
||||
```
|
||||
for (auto &x : j.items())
|
||||
{
|
||||
std::cout << x.key() << ":" << x.value() << std::endl;
|
||||
}
|
||||
```
|
||||
|
||||
- Function `friend std::ostream& operator>>(const basic_json&, std::ostream&)` is deprecated since 3.0.0. Please use [`friend operator<<(std::ostream&, const basic_json&)`](https://json.nlohmann.me/api/operator_ltlt/index.md) instead.
|
||||
|
||||
```
|
||||
j >> std::cout;
|
||||
```
|
||||
|
||||
```
|
||||
std::cout << j;
|
||||
```
|
||||
|
||||
- The legacy comparison behavior for discarded values is deprecated since 3.11.0. It is already disabled by default and can still be enabled by defining [`JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON`](https://json.nlohmann.me/api/macros/json_use_legacy_discarded_value_comparison/index.md) to `1`.
|
||||
|
||||
```
|
||||
#define JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON 1
|
||||
#include <nlohmann/json.hpp>
|
||||
```
|
||||
|
||||
```
|
||||
#include <nlohmann/json.hpp>
|
||||
```
|
||||
|
||||
## Replace implicit conversions
|
||||
|
||||
Implicit conversions via [`operator ValueType`](https://json.nlohmann.me/api/basic_json/operator_ValueType/index.md) will be switched off by default in the next major release of the library.
|
||||
|
||||
You can prepare existing code by already defining [`JSON_USE_IMPLICIT_CONVERSIONS`](https://json.nlohmann.me/api/macros/json_use_implicit_conversions/index.md) to `0` and replace any implicit conversions with calls to [`get`](https://json.nlohmann.me/api/basic_json/get/index.md), [`get_to`](https://json.nlohmann.me/api/basic_json/get_to/index.md), [`get_ref`](https://json.nlohmann.me/api/basic_json/get_ref/index.md), or [`get_ptr`](https://json.nlohmann.me/api/basic_json/get_ptr/index.md).
|
||||
|
||||
```
|
||||
nlohmann::json j = "Hello, world!";
|
||||
std::string s = j;
|
||||
```
|
||||
|
||||
```
|
||||
nlohmann::json j = "Hello, world!";
|
||||
auto s = j.get<std::string>();
|
||||
```
|
||||
|
||||
```
|
||||
nlohmann::json j = "Hello, world!";
|
||||
std::string s;
|
||||
j.get_to(s);
|
||||
```
|
||||
|
||||
## Import namespace `literals` for UDLs
|
||||
|
||||
The user-defined string literals [`operator""_json`](https://json.nlohmann.me/api/operator_literal_json/index.md) and [`operator""_json_pointer`](https://json.nlohmann.me/api/operator_literal_json_pointer/index.md) will be removed from the global namespace in the next major release of the library.
|
||||
|
||||
```
|
||||
nlohmann::json j = "[1,2,3]"_json;
|
||||
```
|
||||
|
||||
```
|
||||
using namespace nlohmann::literals;
|
||||
nlohmann::json j = "[1,2,3]"_json;
|
||||
```
|
||||
|
||||
To prepare existing code, define [`JSON_USE_GLOBAL_UDLS`](https://json.nlohmann.me/api/macros/json_use_global_udls/index.md) to `0` and bring the string literals into scope where needed.
|
||||
|
||||
## Do not hard-code the complete library namespace
|
||||
|
||||
The [`nlohmann` namespace](https://json.nlohmann.me/features/namespace/index.md) contains a sub-namespace to avoid problems when different versions or configurations of the library are used in the same project. Always use `nlohmann` as namespace or, when the exact version and configuration is relevant, use macro [`NLOHMANN_JSON_NAMESPACE`](https://json.nlohmann.me/api/macros/nlohmann_json_namespace/index.md) to denote the namespace.
|
||||
|
||||
```
|
||||
void to_json(nlohmann::json_abi_v3_11_2::json& j, const person& p)
|
||||
{
|
||||
j["age"] = p.age;
|
||||
}
|
||||
```
|
||||
|
||||
```
|
||||
void to_json(nlohmann::json& j, const person& p)
|
||||
{
|
||||
j["age"] = p.age;
|
||||
}
|
||||
```
|
||||
|
||||
```
|
||||
void to_json(NLOHMANN_JSON_NAMESPACE::json& j, const person& p)
|
||||
{
|
||||
j["age"] = p.age;
|
||||
}
|
||||
```
|
||||
|
||||
## Do not use the `details` namespace
|
||||
|
||||
The `details` namespace is not part of the public API of the library and can change in any version without an announcement. Do not rely on any function or type in the `details` namespace.
|
||||
Reference in new issue
Block a user