Std::remove_pointer (3) Linux Manual Page

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.

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

std::remove_pointer (3) Linux Manual Page