Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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is_enum

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

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

C++ Standard Reference: 3.9.2 and 7.2.

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

Compiler Compatibility: Requires a correctly functioning is_convertible template; this means that is_enum is currently broken under Borland C++ Builder 5, and for the Metrowerks compiler prior to version 8, other compilers should handle this template just fine.

Examples:

Given: enum my_enum { one, two };

is_enum<my_enum> inherits from true_type.

is_enum<my_enum const>::type is the type true_type.

is_enum<my_enum>::value is an integral constant expression that evaluates to true.

is_enum<my_enum&>::value is an integral constant expression that evaluates to false.

is_enum<my_enum*>::value is an integral constant expression that evaluates to false.

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


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