Boost C++ Libraries

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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.

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

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.


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