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>
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] | other | object to exchange the contents with |
- Exceptions
-
type_error.310 | when 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()
. ^^ 2 #include <nlohmann/json.hpp> 9 json value = { {
"translation", {{
"one",
"eins"}, {
"two",
"zwei"}}} };
15 value[
"translation"].swap(
object);
18 std::cout <<
"value = " << value <<
'\n';
19 std::cout <<
"object = " <<
object <<
'\n';
basic_json<> json
default JSON class
ObjectType< StringType, basic_json, object_comparator_t, AllocatorType< std::pair< const StringType, basic_json > >> object_t
a type for an object
Output (play with this example online):^^ value = {"translation":{"cow":"Kuh","dog":"Hund"}}
object = {"one":"eins","two":"zwei"}
^^ The example code above can be translated withg++ -std=c++11 -Isingle_include doc/examples/swap__object_t.cpp -o swap__object_t
- Since
- version 1.0.0
Definition at line 17823 of file json.hpp.