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
const_reverse_iterator
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
get_ref
get_ref
insert
insert
insert
insert
insert
is_array
is_boolean
is_discarded
is_null
is_number
is_number_float
is_number_integer
is_object
is_primitive
is_string
is_structured
iterator_wrapper
iterator_wrapper
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[]
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
parse
parse
parse
parse_event_t
parser_callback_t
pointer
push_back
push_back
push_back
rbegin
rbegin
reference
rend
rend
reverse_iterator
size
size_type
string_t
swap
swap
swap
swap
type
value
value
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>
template<typename PointerType , typename std::enable_if< std::is_pointer< PointerType >::value , int >::type = 0>

const PointerType nlohmann::basic_json::get | ( |  | ) | const

inlinenoexcept

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, 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.
  #include <json.hpp>
  using namespace nlohmann;
  int main()
  {
  // create a JSON number
  json value = 17;
  // explicitly getting pointers
  auto p1 = value.get<const json::number_integer_t*>();
  auto p2 = value.get<json::number_integer_t*>();
  auto p3 = value.get<json::number_integer_t* const>();
  auto p4 = value.get<const json::number_integer_t* const>();
  auto p5 = value.get<json::number_float_t*>();
  // print the pointees
  std::cout << *p1 << ' ' << *p2 << ' ' << *p3 << ' ' << *p4 << '\n';
  std::cout << std::boolalpha << (p5 == nullptr) << '\n';
  }
  nlohmann::basic_json
  a class to store JSON values
  Definition: json.hpp:191
  nlohmann
  namespace for Niels Lohmann
  Definition: json.hpp:88
  nlohmann::basic_json::get
  ValueType get() const
  get a value (explicit)
  Definition: json.hpp:2499
  nlohmann::basic_json::number_integer_t
  NumberIntegerType number_integer_t
  a type for a number (integer)
  Definition: json.hpp:537
  nlohmann::basic_json::number_float_t
  NumberFloatType number_float_t
  a type for a number (floating-point)
  Definition: json.hpp:602
  Output (play with this example online):

      17 17 17 17
      true

  The example code above can be translated with

      g++ -std=c++11 -Isrc 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 2548 of file json.hpp.