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    std::is_member_pointer

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    Defined in header <type_traits>
    template< class T > struct is_member_pointer;
    		 (since C++11)
    See More

    std::is_member_pointer is a UnaryTypeTrait.

    If T is pointer to non-static member object or a pointer to non-static member function, provides the member constant value equal true. For any other type, value is false.

    If the program adds specializations for std::is_member_pointer or std::is_member_pointer_v, the behavior is undefined.

    Template parameters

    T - a type to check

    Helper variable template

    template< class T > constexpr bool is_member_pointer_v = is_member_pointer<T>::value;
    		 (since C++17)
    [edit]

    Inherited from std::integral_constant

    Member constants

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

    Member functions

    operator bool
    		 converts the object to bool, returns value
    (public member function)
    operator()
    (C++14)
    		 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_pointer_helper : std::false_type {};

template<class T, class U>
struct is_member_pointer_helper<T U::*> : std::true_type {};

template<class T>
struct is_member_pointer : is_member_pointer_helper<typename std::remove_cv<T>::type> {};

    Example

    Run this code
    #include <cassert>
#include <type_traits>

static_assert(!std::is_member_pointer_v<int*>);

struct S
{
    int i{42};
    int foo() { return 0xF00; }
};
using mem_int_ptr_t = int S::*;
using mem_fun_ptr_t = int (S::*)();
static_assert(std::is_member_pointer_v<mem_int_ptr_t>);
static_assert(std::is_member_pointer_v<mem_fun_ptr_t>);

int main()
{
    S s;

    mem_int_ptr_t pm = &S::i;
    assert(s.i == s.*pm);

    mem_fun_ptr_t pmf = &S::foo;
    assert((s.*pmf)() == s.foo());
}

    See also

    (C++11)
    		 checks if a type is a pointer type
    (class template) [edit]
    (C++11)
    		 checks if a type is a non-static member object pointer
    (class template) [edit]
    (C++11)
    		 checks if a type is a non-static member function pointer
    (class template) [edit]