Namespaces
Variants
Views
Actions

std::is_member_object_pointer

From cppreference.com
< cpp‎ | types
Revision as of 16:51, 1 July 2013 by P12bot (Talk | contribs)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
 
 
 
Type support
Basic types
Fundamental types
Fixed width integer types (C++11)
Numeric limits
C numeric limits interface
Runtime type information
Type traits
Primary type categories
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
is_member_object_pointer
(C++11)
Type properties
(C++11)
(C++11)
(C++11)
(C++14)
Supported operations
Relationships and property queries
(C++11)
(C++11)
(C++11)
(C++11)
Type modifications
(C++11)(C++11)(C++11)
Type transformations
(C++11)
(C++11)
(C++11)
Type trait constants
 
Defined in header <type_traits>
template< class T >
struct is_member_object_pointer;
(since C++11)

Checks whether T is a non-static member object. Provides the member constant value which is equal to true, if T is a non-static member object type. Otherwise, value is equal to false.

Contents

[edit] Template parameters

T - a type to check

Inherited from std::integral_constant

Member constants

value
[static]
true if T is a pointer to member object , false otherwise
(public static member constant)

Member functions

operator bool
converts the object to bool, returns value
(public member function)

Member types

Type Definition
value_type bool
type std::integral_constant<bool, value>

[edit] Possible implementation

template<class T>
struct is_member_object_pointer : std::integral_constant<
                                      bool,
                                      std::is_member_pointer<T>::value &&
                                      !std::is_member_function_pointer<T>::value
                                  > {};

[edit] Example

#include <iostream>
#include <type_traits>
 
int main() {
    class cls {};
    std::cout << (std::is_member_object_pointer<int(cls::*)>::value
                     ? "T is member object pointer"
                     : "T is not a member object pointer") << '\n';
    std::cout << (std::is_member_object_pointer<int(cls::*)()>::value
                     ? "T is member object pointer"
                     : "T is not a member object pointer") << '\n';
}

Output:

T is member object pointer
T is not a member object pointer

[edit] See also

checks if a type is a pointer type
(class template) [edit]
checks if a type is a pointer to a non-static member function or object
(class template) [edit]
checks if a type is a pointer to a non-static member function
(class template) [edit]