add_pointer Class
The latest version of this topic can be found at add_pointer Class.
Makes a pointer-to-type from a specified type.
Syntax
template <class Ty>
struct add_pointer;
template <class T>using add_pointer_t = typename add_pointer<T>::type;
Parameters
Ty
The type to modify.
Remarks
The member typedef type names the same type as remove_reference<T>::type*.
Because it is invalid to make a pointer from a reference, add_pointer removes the reference, if any, from the specified type before it makes a pointer-to-type. Consequently, you can use a type with add_pointer without being concerned about whether the type is a reference.
Example
The following example demonstrates that add_pointer of a type is the same as a pointer to that type.
#include <type_traits>
#include <iostream>
int main()
{
std::add_pointer_t<int> *p = (int **)0;
p = p; // to quiet "unused" warning
std::cout << "add_pointer_t<int> == "
<< typeid(*p).name() << std::endl;
return (0);
}
add_pointer_t<int> == int *
Requirements
Header: <type_traits>
Namespace: std