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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>
string_t nlohmann::basic_json::dump | ( | const int | indent = `-1` | ) | const
| inlinenoexcept
  Serialization function for JSON values. The function tries to mimick Python's `json.dumps()` function, and currently supports its `indent` parameter. Parameters
  [in] | indent | if indent is nonnegative, then array elements and object members will be pretty-printed with that indent level. An indent level of 0 will only insert newlines. -1 (the default) selects the most compact representation
  Returns string containing the serialization of the JSON value Complexity Linear. Example The following example shows the effect of different indent parameters to the result of the serializaion. 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 // call dump() 12 std::cout << j_object.dump() << "\n\n"; 13 std::cout << j_object.dump(-1) << "\n\n"; 14 std::cout << j_object.dump(0) << "\n\n"; 15 std::cout << j_object.dump(4) << "\n\n"; 16 std::cout << j_array.dump() << "\n\n"; 17 std::cout << j_array.dump(-1) << "\n\n"; 18 std::cout << j_array.dump(0) << "\n\n"; 19 std::cout << j_array.dump(4) << "\n\n"; 20 } nlohmann::basic_json a class to store JSON values Definition: json.hpp:124 nlohmann::basic_json::dump string_t dump(const int indent=-1) const noexcept serialization Definition: json.hpp:1423 nlohmann namespace for Niels Lohmann Definition: json.hpp:59 Output:
      {"one":1,"two":2}

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

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

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

      [1,2,4,8,16]

      [1,2,4,8,16]

      [
      1,
      2,
      4,
      8,
      16
      ]

      [
          1,
          2,
          4,
          8,
          16
      ]
  The example code above can be translated with
      g++ -std=c++11 -Isrc doc/examples/dump.cpp -o dump
. See also https://docs.python.org/2/library/json.html#json.dump