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

Inherits: If T is a (top level) volatile-qualified type then inherits from true_type, otherwise inherits from false_type.

C++ Standard Reference: 3.9.3.

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


is_volatile<volatile int> inherits from true_type.

is_volatile<const volatile int>::type is the type true_type.

is_volatile<int* volatile>::value is an integral constant expression that evaluates to true.

is_volatile<int volatile*>::value is an integral constant expression that evaluates to false: the volatile qualifier is not at the top level in this case.

is_volatile<T>::value_type is the type bool.