table of contents
std::remove_pointer(3) | C++ Standard Libary | 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)
2022.07.31 | http://cppreference.com |