std::remove_pointer(3)

NAME
std::remove_pointer - std::remove_pointer

Synopsis
   Defined in header <type_traits>
   template< class T > (since C++11)
   struct remove_pointer;
   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.
   The behavior of a program that adds specializations for remove_pointer is undefined.

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

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

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 <iostream>
 #include <type_traits>
 template<class T1, class T2>
 void print_is_same()
 {
     std::cout << std::is_same<T1, T2>() << '\n';
 }
 void print_separator()
 {
     std::cout << "-----\n";
 }
 int main()
 {
     std::cout << std::boolalpha;
     print_is_same<int, int>(); // true
     print_is_same<int, int*>(); // false
     print_is_same<int, int**>(); // false
     print_separator();
     print_is_same<int, std::remove_pointer<int>::type>(); // true
     print_is_same<int, std::remove_pointer<int*>::type>(); // true
     print_is_same<int, std::remove_pointer<int**>::type>(); // false
     print_separator();
     print_is_same<int, std::remove_pointer<int* const>::type>(); // true
     print_is_same<int, std::remove_pointer<int* volatile>::type>(); // true
     print_is_same<int, std::remove_pointer<int* const volatile>::type>(); // true
 }

Output:
 true
 false
 false
 -----
 true
 true
 false
 -----
 true
 true
 true

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