JSON for Modern C++ 3.10.4

◆ 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, class BinaryType = std::vector<std::uint8_t>>
basic_json & nlohmann::basic_json< ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer, BinaryType >::operator= ( basic_json< ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer, BinaryType >  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
Linear.
Requirements
This function helps basic_json satisfying the Container requirements:
  • The complexity is linear.
Example
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 <iostream>
2#include <nlohmann/json.hpp>
3
4using json = nlohmann::json;
5
6int main()
7{
8 // create JSON values
9 json a = 23;
10 json b = 42;
11
12 // copy-assign a to b
13 b = a;
14
15 // serialize the JSON arrays
16 std::cout << a << '\n';
17 std::cout << b << '\n';
18}
basic_json<> json
default JSON class
Definition: json.hpp:3472

Output (play with this example online):
23
23
The example code above can be translated with
g++ -std=c++11 -Isingle_include doc/examples/basic_json__copyassignment.cpp -o basic_json__copyassignment 
Since
version 1.0.0

Definition at line 19821 of file json.hpp.