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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>
Inserts the given element value to the JSON object. If the function is called on a JSON null value, an empty object is created before inserting value.
- Parameters
-
[in] | value | the value to add to the JSON object |
- Exceptions
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std::domain_error | when called on a type other than JSON object or null |
- Complexity
- Logarithmic in the size of the container, O(log(
size() )).
- Example
- The example shows how
push_back and += can be used to add elements to a JSON object. Note how the null value was silently converted to a JSON object.
8 json object = {{ "one", 1}, { "two", 2}};
12 std::cout << object << '\n';
13 std::cout << null << '\n';
22 std::cout << object << '\n';
23 std::cout << null << '\n';
a class to store JSON values
namespace for Niels Lohmann
void push_back(basic_json &&value) add an object to an array
Output (play with this example online): {"one":1,"two":2}
null
{"four":4,"one":1,"three":3,"two":2}
{"A":"a","B":"b"}
The example code above can be translated withg++ -std=c++11 -Isrc doc/examples/push_back__object_t__value.cpp -o push_back__object_t__value
- Since
- version 1.0
Definition at line 3942 of file json.hpp.
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