JSON for Modern C++ 3.9.1

__pad3__
accept
accept
accept
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
basic_json
basic_json
begin
begin
binary
binary
binary
binary
binary_t
boolean_t
cbegin
cbor_tag_handler_t
cend
clear
const_iterator
const_pointer
const_reference
const_reverse_iterator
contains
contains
count
crbegin
crend
detail::external_constructor
diff
difference_type
dump
emplace
emplace_back
empty
end
end
erase
erase
erase
erase
error_handler_t
exception
find
find
flatten
from_bson
from_bson
from_bson
from_bson
from_cbor
from_cbor
from_cbor
from_cbor
from_msgpack
from_msgpack
from_msgpack
from_msgpack
from_ubjson
from_ubjson
from_ubjson
from_ubjson
front
front
get
get
get
get
get
get
get_allocator
get_binary
get_binary
get_ptr
get_ptr
get_ref
get_ref
get_to
get_to
get_to
initializer_list_t
input_format_t
insert
insert
insert
insert
insert
insert
insert_iterator
invalid_iterator
is_array
is_binary
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
items
items
iterator
iterator_wrapper
iterator_wrapper
json_pointer
json_sax_t
json_serializer
m_value
max_size
merge_patch
meta
number_float_t
number_integer_t
number_unsigned_t
object
object_comparator_t
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[]
other_error
out_of_range
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
sax_parse
sax_parse
sax_parse
size
size_type
string_t
swap
swap
swap
swap
swap
swap
swap
to_bson
to_bson
to_bson
to_cbor
to_cbor
to_cbor
to_msgpack
to_msgpack
to_msgpack
to_ubjson
to_ubjson
to_ubjson
type
type_error
type_name
unflatten
update
update
value
value
value
value
value_t
value_type
~basic_json
| ## ◆ basic_json() [5/10] 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, class BinaryType = std::vector<std::uint8_t>>
nlohmann::basic_json< ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer, BinaryType >::basic_json | ( | initializer_list_t | init,
|  | bool | type_deduction = `true`,
|  | value_t | manual_type = `value_t::array`
| ) |  |
| inline
  Creates a JSON value of type array or object from the passed initializer list init. In case type_deduction is `true` (default), the type of the JSON value to be created is deducted from the initializer list init according to the following rules: If the list is empty, an empty JSON object value `{}` is created. If the list consists of pairs whose first element is a string, a JSON object value is created where the first elements of the pairs are treated as keys and the second elements are as values. In all other cases, an array is created. The rules aim to create the best fit between a C++ initializer list and JSON values. The rationale is as follows: The empty initializer list is written as `{}` which is exactly an empty JSON object. C++ has no way of describing mapped types other than to list a list of pairs. As JSON requires that keys must be of type string, rule 2 is the weakest constraint one can pose on initializer lists to interpret them as an object. In all other cases, the initializer list could not be interpreted as JSON object type, so interpreting it as JSON array type is safe. With the rules described above, the following JSON values cannot be expressed by an initializer list: the empty array (`[]`): use array(initializer_list_t) with an empty initializer list in this case arrays whose elements satisfy rule 2: use array(initializer_list_t) with the same initializer list in this case Note When used without parentheses around an empty initializer list, basic_json() is called instead of this function, yielding the JSON null value. Parameters
  [in] | init | initializer list with JSON values
  [in] | type_deduction | internal parameter; when set to `true`, the type of the JSON value is deducted from the initializer list init; when set to `false`, the type provided via manual_type is forced. This mode is used by the functions array(initializer_list_t) and object(initializer_list_t).
  [in] | manual_type | internal parameter; when type_deduction is set to `false`, the created JSON value will use the provided type (only value_t::array and value_t::object are valid); when type_deduction is set to `true`, this parameter has no effect
  Exceptions
  type_error.301 | if type_deduction is `false`, manual_type is `value_t::object`, but init contains an element which is not a pair whose first element is a string. In this case, the constructor could not create an object. If type_deduction would have be `true`, an array would have been created. See object(initializer_list_t) for an example.
  Complexity Linear in the size of the initializer list init. Exception safety Strong guarantee: if an exception is thrown, there are no changes to any JSON value. Example The example below shows how JSON values are created from initializer lists. 1 #include <iostream> 2 #include <nlohmann/json.hpp> 3 4 using json = nlohmann::json; 5 6 int main() 7 { 8 // create JSON values 9 json j_empty_init_list = json({}); 10 json j_object = { {"one", 1}, {"two", 2} }; 11 json j_array = {1, 2, 3, 4}; 12 json j_nested_object = { {"one", {1}}, {"two", {1, 2}} }; 13 json j_nested_array = { {{1}, "one"}, {{1, 2}, "two"} }; 14 15 // serialize the JSON value 16 std::cout << j_empty_init_list << '\n'; 17 std::cout << j_object << '\n'; 18 std::cout << j_array << '\n'; 19 std::cout << j_nested_object << '\n'; 20 std::cout << j_nested_array << '\n'; 21 } Output (play with this example online):
      {}
      {"one":1,"two":2}
      [1,2,3,4]
      {"one":[1],"two":[1,2]}
      [[[1],"one"],[[1,2],"two"]]
  The example code above can be translated with
      g++ -std=c++11 -Isingle_include doc/examples/basic_json__list_init_t.cpp -o basic_json__list_init_t
See also array(initializer_list_t) – create a JSON array value from an initializer list object(initializer_list_t) – create a JSON object value from an initializer list Since version 1.0.0 Definition at line 18110 of file json.hpp.

nlohmann::json
basic_json<> json
default JSON class
Definition: json.hpp:2940