JSON for Modern C++  3.0
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>
void nlohmann::basic_json::swap ( string_t other)
inline

Exchanges the contents of a JSON string with those of other. Does not invoke any move, copy, or swap operations on individual elements. All iterators and references remain valid. The past-the-end iterator is invalidated.

Parameters
[in,out]otherstring to exchange the contents with
Exceptions
std::domain_errorwhen JSON value is not a string
Complexity
Constant.
Example
The example below shows how JSON values can be swapped.
1 #include <json.hpp>
2 
3 using namespace nlohmann;
4 
5 int main()
6 {
7  // create a JSON value
8  json value = { "the good", "the bad", "the ugly" };
9 
10  // create string_t
11  json::string_t string = "the fast";
12 
13  // swap the object stored in the JSON value
14  value[1].swap(string);
15 
16  // output the values
17  std::cout << "value = " << value << '\n';
18  std::cout << "string = " << string << '\n';
19 }
StringType string_t
a type for a string
Definition: json.hpp:347
a class to store JSON values
Definition: json.hpp:130
namespace for Niels Lohmann
Definition: json.hpp:55
void swap(reference other) noexcept(std::is_nothrow_move_constructible< value_t >::value andstd::is_nothrow_move_assignable< value_t >::value andstd::is_nothrow_move_constructible< json_value >::value andstd::is_nothrow_move_assignable< json_value >::value)
exchanges the values
Definition: json.hpp:3743
Output (play with this example online):
value = ["the good","the fast","the ugly"]
string = the bad
The example code above can be translated with
g++ -std=c++11 -Isrc doc/examples/swap__string_t.cpp -o swap__string_t