JSON for Modern C++ 2.1.1
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◆ operator=()

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>
reference & nlohmann::basic_json< ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer >::operator= ( basic_json< ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer other)
inlinenoexcept

Copy assignment operator. Copies a JSON value via the "copy and swap" strategy: It is expressed in terms of the copy constructor, destructor, and the swap() member function.

Parameters
[in]othervalue to copy from
Complexity\n Linear.
Requirements\n This function helps basic_json satisfying the
Container requirements:
  • The complexity is linear.
Example\n The code below shows and example for the copy assignment. It
creates a copy of value a which is then swapped with b. Finally, the copy of a (which is the null value after the swap) is destroyed.
1#include <json.hpp>
2
3using json = nlohmann::json;
4
5int main()
6{
7 // create JSON values
8 json a = 23;
9 json b = 42;
10
11 // copy-assign a to b
12 b = a;
13
14 // serialize the JSON arrays
15 std::cout << a << '\n';
16 std::cout << b << '\n';
17}
static basic_json array(std::initializer_list< basic_json > init=std::initializer_list< basic_json >())
explicitly create an array from an initializer list
Definition json.hpp:2165
a class to store JSON values
Definition json.hpp:1040
basic_json<> json
default JSON class
Definition json.hpp:12369

Output (play with this example online):
23
23

The example code above can be translated with
g++ -std=c++11 -Isrc doc/examples/basic_json__copyassignment.cpp -o basic_json__copyassignment 
Since
version 1.0.0

Definition at line 2542 of file json.hpp.