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 = int64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator>

static basic_json nlohmann::basic_json::object ( list_init_t  init = list_init_t() )

inlinestatic

Creates a JSON object value from a given initializer list. The initializer lists elements must be pairs, and their first elments must be strings. If the initializer list is empty, the empty object {} is created.

Note

This function is only added for symmetry reasons. In contrast to the related function basic_json array(list_init_t), there are no cases which can only be expressed by this function. That is, any initializer list init can also be passed to the initializer list constructor basic_json(list_init_t, bool, value_t).

Parameters

[in]

init

initializer list to create an object from (optional)

Returns

JSON object value

Exceptions

std::domain_error

if init is not a pair whose first elements are strings; thrown by basic_json(list_init_t, bool, value_t)

Complexity

Linear in the size of init.

Example

The following code shows an example for the object function.

#include <json.hpp>

using namespace nlohmann;

int main()
{
    // create JSON arrays
    json j_no_init_list = json::object();
    json j_empty_init_list = json::object({});
    json j_list_of_pairs = json::object({ {"one", 1}, {"two", 2} });
    //json j_invalid_list = json::object({ "one", 1 }); // would throw

    // serialize the JSON arrays
    std::cout << j_no_init_list << '\n';
    std::cout << j_empty_init_list << '\n';
    std::cout << j_list_of_pairs << '\n';
}

Output:

{}
{}
{"one":1,"two":2}

The example code above can be translated with

g++ -std=c++11 -Isrc doc/examples/object.cpp -o object 

.

See also

basic_json(list_init_t, bool, value_t) - create a JSON value from an initializer list

basic_json array(list_init_t) - create a JSON array value from an initializer list