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 array 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 | array to exchange the contents with |
- Exceptions
-
type_error.310 | when JSON value is not an array; example: "cannot
use swap() with string" |
- Complexity
- Constant.
- Example
- The example below shows how arrays can be swapped with
swap()
. 2 #include <nlohmann/json.hpp> 18 std::cout <<
"value = " <<
value <<
'\n';
19 std::cout <<
"array = " <<
array <<
'\n';
static basic_json array(initializer_list_t init={})
explicitly create an array from an initializer list
basic_json<> json
default JSON class
ArrayType< basic_json, AllocatorType< basic_json > > array_t
a type for an array
ValueType value(const typename object_t::key_type &key, const ValueType &default_value) const
access specified object element with default value
Output (play with this example online): value = {"array":["Snap","Crackle","Pop"]}
array = [1,2,3,4]
The example code above can be translated withg++ -std=c++11 -Isingle_include doc/examples/swap__array_t.cpp -o swap__array_t
- Since
- version 1.0.0
Definition at line 18291 of file json.hpp.