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Add helper types to make it easier to create a basic_json type with modified template parameters

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Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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2026-10-04 18:00:36 +02:00
committed by Niels Lohmann
parent 8c1f60a45e
commit c7a0d59e16
7 changed files with 127 additions and 77 deletions
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single_include/nlohmann/json.hpp
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@@ -27348,6 +27348,65 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
/// SAX interface type, see @ref nlohmann::json_sax
using json_sax_t = json_sax<basic_json>;
////////////////////////////////////////////////////////////////////////////////
// utility templates to create a json type with different template parameters //
////////////////////////////////////////////////////////////////////////////////
/// Json type using a different type for storing objects
template<template<typename, typename, typename...> class ObjectType2>
using with_changed_object_t = basic_json<ObjectType2, ArrayType, StringType, BooleanType,
NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer, BinaryType, CustomBaseClass>;
/// Json type using a different type for storing arrays
template<template<typename, typename...> class ArrayType2>
using with_changed_array_t = basic_json<ObjectType, ArrayType2, StringType, BooleanType,
NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer, BinaryType, CustomBaseClass>;
/// Json type using a different type for storing strings
template<class StringType2>
using with_changed_string_t = basic_json<ObjectType, ArrayType, StringType2, BooleanType,
NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer, BinaryType, CustomBaseClass>;
/// Json type using a different type for storing booleans
template<class BooleanType2>
using with_changed_boolean_t = basic_json<ObjectType, ArrayType, StringType, BooleanType2,
NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer, BinaryType, CustomBaseClass>;
/// Json type using a different type for storing signed integers
template<class NumberIntegerType2>
using with_changed_integer_t = basic_json<ObjectType, ArrayType, StringType, BooleanType,
NumberIntegerType2, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer, BinaryType, CustomBaseClass>;
/// Json type using a different type for storing unsigned integers
template<class NumberUnsignedType2>
using with_changed_unsigned_t = basic_json<ObjectType, ArrayType, StringType, BooleanType,
NumberIntegerType, NumberUnsignedType2, NumberFloatType, AllocatorType, JSONSerializer, BinaryType, CustomBaseClass>;
/// Json type using a different type for storing floating point numbers
template<class NumberFloatType2>
using with_changed_float_t = basic_json<ObjectType, ArrayType, StringType, BooleanType,
NumberIntegerType, NumberUnsignedType, NumberFloatType2, AllocatorType, JSONSerializer, BinaryType, CustomBaseClass>;
/// Json type using a different type as base allocator
template<template<typename> class AllocatorType2>
using with_changed_allocator_t = basic_json<ObjectType, ArrayType, StringType, BooleanType,
NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType2, JSONSerializer, BinaryType, CustomBaseClass>;
/// Json type using a different type as json serializer
template<template<typename, typename = void> class JSONSerializer2>
using with_changed_json_serializer_t = basic_json<ObjectType, ArrayType, StringType, BooleanType,
NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer2, BinaryType, CustomBaseClass>;
/// Json type using a different type for storing binary data
template<class BinaryType2>
using with_changed_binary_t = basic_json<ObjectType, ArrayType, StringType, BooleanType,
NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer, BinaryType2, CustomBaseClass>;
/// Json type using a different type as base class
template<class CustomBaseClass2>
using with_changed_base_class_t = basic_json<ObjectType, ArrayType, StringType, BooleanType,
NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer, BinaryType, CustomBaseClass2>;
////////////////
// exceptions //
////////////////