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std:: remove_pointer

From cppreference.net
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Compile-time rational arithmetic
Compile-time integer sequences
(C++14)
Defined in header <type_traits>
template < class T >
struct remove_pointer ;
(since C++11)

Provides the member typedef type which is the type pointed to by T , or, if T is not a pointer, then type is the same as T .

If the program adds specializations for std::remove_pointer , the behavior is undefined.

Contents

Member types

Name Definition
type the type pointed to by T or T if it's not a pointer

Helper types

template < class T >
using remove_pointer_t = typename remove_pointer < T > :: type ;
(since C++14)

Possible implementation 

template<class T> struct remove_pointer { typedef T type; };
template<class T> struct remove_pointer<T*> { typedef T type; };
template<class T> struct remove_pointer<T* const> { typedef T type; };
template<class T> struct remove_pointer<T* volatile> { typedef T type; };
template<class T> struct remove_pointer<T* const volatile> { typedef T type; };

Example

Run this code 
#include <type_traits>
static_assert
(
    std::is_same_v<int, int> == true &&
    std::is_same_v<int, int*> == false &&
    std::is_same_v<int, int**> == false &&
    std::is_same_v<int, std::remove_pointer_t<int>> == true &&
    std::is_same_v<int, std::remove_pointer_t<int*>> == true &&
    std::is_same_v<int, std::remove_pointer_t<int**>> == false &&
    std::is_same_v<int, std::remove_pointer_t<int* const>> == true &&
    std::is_same_v<int, std::remove_pointer_t<int* volatile>> == true &&
    std::is_same_v<int, std::remove_pointer_t<int* const volatile>> == true
);
int main() {}

See also

(C++11)
checks if a type is a pointer type
(class template)
(C++11)
adds a pointer to the given type
(class template)