allocator_type
array
array_t
at
at
at
at
back
back
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
begin
begin
boolean_t
cbegin
cend
clear
const_pointer
const_reference
count
crbegin
crend
difference_type
dump
empty
end
end
erase
erase
erase
erase
find
find
front
front
get
get
get_allocator
get_ptr
is_array
is_boolean
is_discarded
is_null
is_number
is_number_float
is_number_integer
is_object
is_primitive
is_string
is_structured
list_init_t
max_size
number_float_t
number_integer_t
object
object_t
operator value_t
operator ValueType
operator!=
operator+=
operator+=
operator+=
operator<
operator<
operator<<
operator<<
operator<=
operator=
operator==
operator>
operator>=
operator>>
operator>>
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
parse
parse
parse_event_t
parser_callback_t
pointer
push_back
push_back
push_back
rbegin
rbegin
reference
rend
rend
size
size_type
string_t
swap
swap
swap
swap
type
value_t
value_type
~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.
  #include <json.hpp>
  using namespace nlohmann;
  int main()
  {
  // create JSON values
  json j_object = {{"one", 1}, {"two", 2}};
  json j_array = {1, 2, 4, 8, 16};
  // call dump()
  std::cout << j_object.dump() << "\n\n";
  std::cout << j_object.dump(-1) << "\n\n";
  std::cout << j_object.dump(0) << "\n\n";
  std::cout << j_object.dump(4) << "\n\n";
  std::cout << j_array.dump() << "\n\n";
  std::cout << j_array.dump(-1) << "\n\n";
  std::cout << j_array.dump(0) << "\n\n";
  std::cout << j_array.dump(4) << "\n\n";
  }
  nlohmann::basic_json
  a class to store JSON values
  Definition: json.hpp:121
  nlohmann::basic_json::dump
  string_t dump(const int indent=-1) const noexcept
  serialization
  Definition: json.hpp:1418
  nlohmann
  namespace for Niels Lohmann
  Definition: json.hpp:56
  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