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std::is_member_function_pointer

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Revision as of 12:03, 14 May 2013 by P12 (Talk | contribs)

 
 
 
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is_member_function_pointer
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Template:ddcl list begin <tr class="t-dsc-header">

<td>
Defined in header <type_traits>
</td>

<td></td> <td></td> <tr class="t-dcl-sep"><td></td><td></td><td></td></tr>

<tr class="t-dcl ">

<td >
template< class T >
struct is_member_function_pointer;
</td>

<td class="t-dcl-nopad"> </td> <td > (since C++11) </td> </tr> Template:ddcl list end

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

Contents

Template parameters

T - a type to check

Inherited from std::integral_constant

Member constants

value
[static]
true if T is a member function pointer type , 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>

Possible implementation

template< class T >
struct is_member_function_pointer_helper : std::false_type {};
 
template< class T, class U>
struct is_member_function_pointer_helper<T U::*> : std::is_function<T> {};
 
template< class T >
struct is_member_function_pointer : is_member_function_pointer_helper<
                                        typename std::remove_cv<T>::type
                                    > {};

Example

#include <type_traits>
 
class A {
    void member_function() { }
};
 
int main()
{
    // fails at compile time if A does not contain member_function as a function.
    static_assert(std::is_member_function_pointer<decltype(&A::member_function)>::value,
                  "Class does not contain member."); 
}


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