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
get_allocator
get_ptr
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
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>

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.
  #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};
  // serialize without indentation
  std::cout << j_object << "\n\n";
  std::cout << j_array << "\n\n";
  // serialize with indentation
  std::cout << std::setw(4) << j_object << "\n\n";
  std::cout << std::setw(2) << j_array << "\n\n";
  }
  nlohmann::basic_json
  a class to store JSON values
  Definition: json.hpp:130
  nlohmann
  namespace for Niels Lohmann
  Definition: json.hpp:55
  Output (play with this example online):

      {"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