JSON for Modern C++ 2.1.1
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◆ swap() [2/4]

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>
void nlohmann::basic_json< ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer >::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\n Constant.
Example\n The example below shows how objects can be swapped with
swap().
1#include <json.hpp>
2
3using json = nlohmann::json;
4
5int 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}
static basic_json array(std::initializer_list< basic_json > init=std::initializer_list< basic_json >())
explicitly create an array from an initializer list
Definition json.hpp:2165
void swap(reference other) noexcept(std::is_nothrow_move_constructible< value_t >::value and std::is_nothrow_move_assignable< value_t >::value and std::is_nothrow_move_constructible< json_value >::value and std::is_nothrow_move_assignable< json_value >::value)
exchanges the values
Definition json.hpp:5738
ObjectType< StringType, basic_json, std::less< StringType >, AllocatorType< std::pair< const StringType, basic_json > > > object_t
a type for an object
Definition json.hpp:1282
@ value
the parser finished reading a JSON value
a class to store JSON values
Definition json.hpp:1040
basic_json<> json
default JSON class
Definition json.hpp:12369

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 5803 of file json.hpp.