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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>
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
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[in,out] | other | object to exchange the contents with |
- Exceptions
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std::domain_error | when 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() .
8 json value = { { "translation", {{ "one", "eins"}, { "two", "zwei"}}} };
17 std::cout << "value = " << value << '\n';
18 std::cout << "object = " << object << '\n';
static basic_json array(std::initializer_list< basic_json > init=std::initializer_list< basic_json >()) explicitly create an array from an initializer list
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
ObjectType< StringType, basic_json, std::less< StringType >, AllocatorType< std::pair< const StringType, basic_json > > > object_t a type for an object
@ value the parser finished reading a JSON value
a class to store JSON values
basic_json<> json default JSON class
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.
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