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### add_pointer

    template <class T>
    struct add_pointer
    {
       typedef see-below type;
    };

    template <class T> using add_pointer_t = typename add_pointer<T>::type; // C++11 and above

type: The same type as `remove_reference<T>::type*`.

The rationale for this template is that it produces the same type as `decltype(&t)`, where `t` is an object of type `T`.

C++ Standard Reference: 8.3.1.

Header: `#include <boost/type_traits/add_pointer.hpp>` or `#include <boost/type_traits.hpp>`

Table 1.13. Examples

Expression | Result Type
--- | ---
`add_pointer<int>::type` | `int*`
`add_pointer<int const&>::type` | `int const*`
`add_pointer<int*>::type` | `int**`
`add_pointer<int*&>::type` | `int**`

Compiler Compatibility: All current compilers are supported by this trait.