JSON for Modern C++  2.0.3
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>
void nlohmann::basic_json::swap ( object_t other)
inline

Exchanges the contents of a JSON object 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]otherobject to exchange the contents with
Exceptions
std::domain_errorwhen JSON value is not an object; example: "cannot use swap() with string"
Complexity
Constant.
Example
The example below shows how objects can be swapped with swap().
1 #include <json.hpp>
2 
3 using json = nlohmann::json;
4 
5 int main()
6 {
7  // create a JSON value
8  json value = { {"translation", {{"one", "eins"}, {"two", "zwei"}}} };
9 
10  // create an object_t
11  json::object_t object = {{"cow", "Kuh"}, {"dog", "Hund"}};
12 
13  // swap the object stored in the JSON value
14  value["translation"].swap(object);
15 
16  // output the values
17  std::cout << "value = " << value << '\n';
18  std::cout << "object = " << object << '\n';
19 }
basic_json<> json
default JSON class
Definition: json.hpp:10122
ObjectType< StringType, basic_json, std::less< StringType >, AllocatorType< std::pair< const StringType, basic_json >>> object_t
a type for an object
Definition: json.hpp:391
Output (play with this example online):
value = {"translation":{"cow":"Kuh","dog":"Hund"}}
object = {"one":"eins","two":"zwei"}
The example code above can be translated with
g++ -std=c++11 -Isrc doc/examples/swap__object_t.cpp -o swap__object_t 
Since
version 1.0.0

Definition at line 5341 of file json.hpp.