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### is_unscoped_enum

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

Inherits: If T is a (possibly cv-qualified) unscoped enumeration type (`enum` but not `enum class`), then inherits from true_type, otherwise inherits from false_type.

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

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

Examples:

> Given: `enum color { red, blue };` and `enum class fruit { apple, orange };`

> `is_unscoped_enum<color>` inherits from `true_type`.

> `is_unscoped_enum<fruit>` inherits from `false_type`.

> `is_unscoped_enum<color const>::type` is the type `true_type`.

> `is_unscoped_enum<color>::value` is an integral constant expression that evaluates to true.

> `is_unscoped_enum<color&>::value` is an integral constant expression that evaluates to false.

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

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