JSON for Modern C++  3.7.0

◆ basic_json() [9/9]

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>
nlohmann::basic_json::basic_json ( basic_json &&  other)
inlinenoexcept

Move constructor. Constructs a JSON value with the contents of the given value other using move semantics. It "steals" the resources from other and leaves it as JSON null value.

Parameters
[in,out]othervalue to move to this object
Postcondition
*this has the same value as other before the call.
other is a JSON null value.
Complexity
Constant.
Exception safety
No-throw guarantee: this constructor never throws exceptions.
Requirements
This function helps basic_json satisfying the MoveConstructible requirements.
Example
The code below shows the move constructor explicitly called via std::move.
1 #include <iostream>
2 #include <nlohmann/json.hpp>
3 
4 using json = nlohmann::json;
5 
6 int main()
7 {
8  // create a JSON value
9  json a = 23;
10 
11  // move contents of a to b
12  json b(std::move(a));
13 
14  // serialize the JSON arrays
15  std::cout << a << '\n';
16  std::cout << b << '\n';
17 }
basic_json<> json
default JSON class
Definition: json.hpp:2355

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

Definition at line 16248 of file json.hpp.