JSON for Modern C++ 3.9.1

__pad3__
accept
accept
accept
allocator_type
array
array_t
at
at
at
at
at
at
back
back
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
begin
begin
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cbegin
cbor_tag_handler_t
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end
erase
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error_handler_t
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~basic_json
| ## ◆ object_t template<template< typename U, typename V, typename... Args > class ObjectType = std::map, template< typename U, typename... Args > class ArrayType = std::vector, class StringType = std::string, class BooleanType = bool, class NumberIntegerType = std::int64_t, class NumberUnsignedType = std::uint64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator, template< typename T, typename SFINAE=void > class JSONSerializer = adl_serializer, class BinaryType = std::vector<std::uint8_t>>
using nlohmann::basic_json< ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer, BinaryType >::object_t = ObjectType<StringType, basic_json, object_comparator_t, AllocatorType<std::pair<const StringType, basic_json> >>
  RFC 7159 describes JSON objects as follows: An object is an unordered collection of zero or more name/value pairs, where a name is a string and a value is a string, number, boolean, null, object, or array. To store objects in C++, a type is defined by the template parameters described below. Template Parameters
  ObjectType | the container to store objects (e.g., `std::map` or `std::unordered_map`)
  StringType | the type of the keys or names (e.g., `std::string`). The comparison function `std::less<StringType>` is used to order elements inside the container.
  AllocatorType | the allocator to use for objects (e.g., `std::allocator`)
#### Default type With the default values for ObjectType (`std::map`), StringType (`std::string`), and AllocatorType (`std::allocator`), the default value for object_t is: std::map< std::string, // key_type basic_json, // value_type std::less<std::string>, // key_compare std::allocator<std::pair<const std::string, basic_json>> // allocator_type > #### Behavior The choice of object_t influences the behavior of the JSON class. With the default type, objects have the following behavior: When all names are unique, objects will be interoperable in the sense that all software implementations receiving that object will agree on the name-value mappings. When the names within an object are not unique, it is unspecified which one of the values for a given key will be chosen. For instance, `{"key": 2, "key": 1}` could be equal to either `{"key": 1}` or `{"key": 2}`. Internally, name/value pairs are stored in lexicographical order of the names. Objects will also be serialized (see dump) in this order. For instance, `{"b": 1, "a": 2}` and `{"a": 2, "b": 1}` will be stored and serialized as `{"a": 2, "b": 1}`. When comparing objects, the order of the name/value pairs is irrelevant. This makes objects interoperable in the sense that they will not be affected by these differences. For instance, `{"b": 1, "a": 2}` and `{"a": 2, "b": 1}` will be treated as equal. #### Limits RFC 7159 specifies: An implementation may set limits on the maximum depth of nesting. In this class, the object's limit of nesting is not explicitly constrained. However, a maximum depth of nesting may be introduced by the compiler or runtime environment. A theoretical limit can be queried by calling the max_size function of a JSON object. #### Storage Objects are stored as pointers in a basic_json type. That is, for any access to object values, a pointer of type `object_t*` must be dereferenced. See also array_t – type for an array value Since version 1.0.0 Note The order name/value pairs are added to the object is not preserved by the library. Therefore, iterating an object may return name/value pairs in a different order than they were originally stored. In fact, keys will be traversed in alphabetical order as `std::map` with `std::less` is used by default. Please note this behavior conforms to RFC 7159, because any order implements the specified "unordered" nature of JSON objects. Definition at line 17008 of file json.hpp.

nlohmann::basic_json::basic_json
basic_json(const value_t v)
create an empty value with a given type
Definition: json.hpp:17853