JSON for Modern C++ 3.8.0

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
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
| ## ◆ get() [3/6] template<typename PointerType , typename std::enable_if< std::is_pointer< PointerType >::value, int >::type = 0>
constexpr auto nlohmann::basic_json::get | ( |  | ) | const -> decltype(std::declval<const basic_json_t&>().template get_ptr<PointerType>())
| inline constexpr noexcept
  get a pointer value (explicit) Explicit pointer access to the internally stored JSON value. No copies are made. Warning The pointer becomes invalid if the underlying JSON object changes. Template Parameters
  PointerType | pointer type; must be a pointer to array_t, object_t, string_t, boolean_t, number_integer_t, number_unsigned_t, or number_float_t.
  Returns pointer to the internally stored JSON value if the requested pointer type PointerType fits to the JSON value; `nullptr` otherwise Complexity Constant. Example The example below shows how pointers to internal values of a JSON value can be requested. Note that no type conversions are made and a `nullptr` is returned if the value and the requested pointer type does not match. 1 #include <iostream> 2 #include <nlohmann/json.hpp> 3 4 using json = nlohmann::json; 5 6 int main() 7 { 8 // create a JSON number 9 json value = 17; 10 11 // explicitly getting pointers 12 auto p1 = value.get<const json::number_integer_t*>(); 13 auto p2 = value.get<json::number_integer_t*>(); 14 auto p3 = value.get<json::number_integer_t* const>(); 15 auto p4 = value.get<const json::number_integer_t* const>(); 16 auto p5 = value.get<json::number_float_t*>(); 17 18 // print the pointees 19 std::cout << *p1 << ' ' << *p2 << ' ' << *p3 << ' ' << *p4 << '\n'; 20 std::cout << std::boolalpha << (p5 == nullptr) << '\n'; 21 } Output (play with this example online):
      17 17 17 17
      true
  The example code above can be translated with
      g++ -std=c++11 -Isingle_include doc/examples/get__PointerType.cpp -o get__PointerType
See also get_ptr() for explicit pointer-member access Since version 1.0.0 Definition at line 19527 of file json.hpp.

nlohmann::basic_json::number_integer_t
NumberIntegerType number_integer_t
a type for a number (integer)
Definition: json.hpp:17088
nlohmann::basic_json::value
ValueType value(const typename object_t::key_type &key, const ValueType &default_value) const
access specified object element with default value
Definition: json.hpp:20189
nlohmann::basic_json::number_float_t
NumberFloatType number_float_t
a type for a number (floating-point)
Definition: json.hpp:17227
nlohmann::json
basic_json<> json
default JSON class
Definition: json.hpp:2933