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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>
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(std::initializer_list<basic_json>), 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(std::initializer_list<basic_json>, bool, value_t).
- Parameters
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[in] | init | initializer list to create an object from (optional) |
- Returns
- JSON object value
- Exceptions
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std::domain_error | if init is not a pair whose first elements are strings; thrown by basic_json(std::initializer_list<basic_json>, bool, value_t) |
- Complexity
- Linear in the size of init.
- Example
- The following code shows an example for the object function.
14 std::cout << j_no_init_list << '\n';
15 std::cout << j_empty_init_list << '\n';
16 std::cout << j_list_of_pairs << '\n';
static basic_json object(std::initializer_list< basic_json > init=std::initializer_list< basic_json >()) explicitly create an object from an initializer list Definition: json.hpp:1333
a class to store JSON values Definition: json.hpp:130
namespace for Niels Lohmann Definition: json.hpp:55
Output (play with this example online): {}
{}
{"one":1,"two":2}
The example code above can be translated withg++ -std=c++11 -Isrc doc/examples/object.cpp -o object
- See also
- basic_json(std::initializer_list<basic_json>, bool, value_t) - create a JSON value from an initializer list
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basic_json array(std::initializer_list<basic_json>) - create a JSON array value from an initializer list
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