JSON for Modern C++ 3.0

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~basic_json
| 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>
void nlohmann::basic_json::swap | ( | reference | other | ) |
| inline noexcept
  Exchanges the contents of the JSON value 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 | JSON value to exchange the contents with
  Complexity Constant. Example The example below shows how JSON arrays can be swapped. 1 #include <json.hpp> 2 3 using namespace nlohmann; 4 5 int main() 6 { 7 // create two JSON values 8 json j1 = {1, 2, 3, 4, 5}; 9 json j2 = {{"pi", 3.141592653589793}, {"e", 2.718281828459045}}; 10 11 // swap the values 12 j1.swap(j2); 13 14 // output the values 15 std::cout << "j1 = " << j1 << '\n'; 16 std::cout << "j2 = " << j2 << '\n'; 17 } nlohmann::basic_json a class to store JSON values Definition: json.hpp:121 nlohmann namespace for Niels Lohmann Definition: json.hpp:56 nlohmann::basic_json::swap 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:3370 Output:
      j1 = {"e":2.71828182845905,"pi":3.14159265358979}
      j2 = [1,2,3,4,5]
  The example code above can be translated with
      g++ -std=c++11 -Isrc doc/examples/swap__reference.cpp -o swap__reference
.