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.
| Name | Definition |
|---|---|
type | the type pointed to by T or T if it's not a pointer |
template< class T > using remove_pointer_t = typename remove_pointer<T>::type; | (since C++14) |
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;}; |
#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
|
(C++11) | checks if a type is a pointer type (class template) |
|
(C++11) | adds pointer to the given type (class template) |
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