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>
std::ostream& operator>> | ( | const basic_json & | j,
|  | std::ostream & | o
| ) |  |
| friend
  serialize to stream Serialize the given JSON value j to the output stream o. The JSON value will be serialized using the dump member function. The indentation of the output can be controlled with the member variable `width` of the output stream o. For instance, using the manipulator `std::setw(4)` on o sets the indentation level to `4` and the serialization result is the same as calling `dump(4)`. Parameters
  [in,out] | o | stream to serialize to
  [in] | j | JSON value to serialize
  Returns the stream o Complexity Linear. Example The example below shows the serialization with different parameters to `width` to adjust the indentation level. 1 #include <json.hpp> 2 3 using namespace nlohmann; 4 5 int main() 6 { 7 // create JSON values 8 json j_object = {{"one", 1}, {"two", 2}}; 9 json j_array = {1, 2, 4, 8, 16}; 10 11 // serialize without indentation 12 std::cout << j_object << "\n\n"; 13 std::cout << j_array << "\n\n"; 14 15 // serialize with indentation 16 std::cout << std::setw(4) << j_object << "\n\n"; 17 std::cout << std::setw(2) << j_array << "\n\n"; 18 } nlohmann::basic_json a class to store JSON values Definition: json.hpp:121 nlohmann namespace for Niels Lohmann Definition: json.hpp:56 Output:
      {"one":1,"two":2}

      [1,2,4,8,16]

      {
          "one": 1,
          "two": 2
      }

      [
        1,
        2,
        4,
        8,
        16
      ]
  The example code above can be translated with
      g++ -std=c++11 -Isrc doc/examples/operator_serialize.cpp -o operator_serialize
.