JSON for Modern C++ 2.1.1

allocator_type
array
array_t
at
at
at
at
at
at
back
back
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
begin
begin
boolean_t
cbegin
cend
clear
const_iterator
const_pointer
const_reference
const_reverse_iterator
count
crbegin
crend
detail::external_constructor
diff
difference_type
dump
emplace
emplace_back
empty
end
end
erase
erase
erase
erase
exception
find
find
flatten
from_cbor
from_msgpack
front
front
get
get
get
get
get
get_allocator
get_ptr
get_ptr
get_ref
get_ref
insert
insert
insert
insert
insert
insert
invalid_iterator
is_array
is_boolean
is_discarded
is_null
is_number
is_number_float
is_number_integer
is_number_unsigned
is_object
is_primitive
is_string
is_structured
iterator
iterator_wrapper
iterator_wrapper
json_serializer
max_size
meta
number_float_t
number_integer_t
number_unsigned_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>
operator>
operator>=
operator>=
operator>=
operator>>
operator>>
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
other_error
out_of_range
parse
parse
parse
parse
parse
parse
parse_error
parse_event_t
parser_callback_t
patch
pointer
push_back
push_back
push_back
push_back
rbegin
rbegin
reference
rend
rend
reverse_iterator
size
size_type
string_t
swap
swap
swap
swap
to_cbor
to_msgpack
type
type_error
type_name
unflatten
value
value
value
value
value_t
value_type
~basic_json
| ## ◆ operator<< [1/2] 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 = std::int64_t, class NumberUnsignedType = std::uint64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator, template< typename T, typename SFINAE=void > class JSONSerializer = adl_serializer>
std::ostream& operator<< | ( | std::ostream & | o,
|  | const basic_json & | j
| ) |  |
| friend
  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 #include <iomanip> // for std::setw 3 4 using json = nlohmann::json; 5 6 int main() 7 { 8 // create JSON values 9 json j_object = {{"one", 1}, {"two", 2}}; 10 json j_array = {1, 2, 4, 8, 16}; 11 12 // serialize without indentation 13 std::cout << j_object << "\n\n"; 14 std::cout << j_array << "\n\n"; 15 16 // serialize with indentation 17 std::cout << std::setw(4) << j_object << "\n\n"; 18 std::cout << std::setw(2) << j_array << "\n\n"; 19 } nlohmann::json basic_json<> json default JSON class Definition: json.hpp:13933 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
Since version 1.0.0 Definition at line 7218 of file json.hpp.