| Home | Libraries | People | FAQ | More

### is_void

    template <class T>
    struct is_void : public true_type-or-false_type {};

Inherits: If T is a (possibly cv-qualified) void type then inherits from true_type, otherwise inherits from false_type.

C++ Standard Reference: 3.9.1p9.

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

Examples:

> `is_void<void>` inherits from `true_type`.

> `is_void<const void>::type` is the type `true_type`.

> `is_void<void>::value` is an integral constant expression that evaluates to true.

> `is_void<void*>::value` is an integral constant expression that evaluates to false.

> `is_void<T>::value_type` is the type `bool`.