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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 = int64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator>
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
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[in,out] | other | array to exchange the contents with |
- Exceptions
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std::domain_error | when JSON value is not an array |
- Complexity
- Constant.
- Example
- The example below shows how JSON values can be swapped.
8 json value = {{ "array", {1, 2, 3, 4}}};
14 value[ "array"]. swap(array);
17 std::cout << "value = " << value << '\n';
18 std::cout << "array = " << array << '\n';
ArrayType< basic_json, AllocatorType< basic_json >> array_t a type for an array Definition: json.hpp:303
a class to store JSON values Definition: json.hpp:130
namespace for Niels Lohmann Definition: json.hpp:55
void swap(reference other) noexcept(std::is_nothrow_move_constructible< value_t >::value andstd::is_nothrow_move_assignable< value_t >::value andstd::is_nothrow_move_constructible< json_value >::value andstd::is_nothrow_move_assignable< json_value >::value) exchanges the values Definition: json.hpp:3743
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 -Isrc doc/examples/swap__array_t.cpp -o swap__array_t
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