push_back() [4/4]

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>>

void nlohmann::basic_json< ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer, BinaryType >::push_back ( initializer_list_t  init )

inline

add an object to an object

This function allows to use push_back with an initializer list. In case

1. the current value is an object,
2. the initializer list init contains only two elements, and
3. the first element of init is a string,

init is converted into an object element and added using push_back(const typename object_t::value_type&). Otherwise, init is converted to a JSON value and added using push_back(basic_json&&).

Parameters

[in]

init

an initializer list

@complexity Linear in the size of the initializer list init.

Note

This function is required to resolve an ambiguous overload error, because pairs like {"key", "value"} can be both interpreted as object_t::value_type or std::initializer_list<basic_json>, see https://github.com/nlohmann/json/issues/235 for more information.

@liveexample{The example shows how initializer lists are treated as objects when possible.,push_back__initializer_list}

Definition at line 23293 of file json.hpp.

    {
        if (is_object() && init.size() == 2 && (*init.begin())->is_string())
        {
            basic_json &&key = init.begin()->moved_or_copied();
            push_back(typename object_t::value_type(
                          std::move(key.get_ref<string_t &>()), (init.begin() + 1)->moved_or_copied()));
        }
 
        else
        {
            push_back(basic_json(init));
        }
    }