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### add_volatile

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

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

type: The same type as `T volatile` for all `T`.

C++ Standard Reference: 3.9.3.

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

Table 1.16. Examples

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

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