JSON for Modern C++  1.0.0-rc1
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>
reference& nlohmann::basic_json::operator= ( basic_json  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 satisfies 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 <json.hpp>
2 
3 using namespace nlohmann;
4 
5 int 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 }
a class to store JSON values
Definition: json.hpp:182
namespace for Niels Lohmann
Definition: json.hpp:78
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