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
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
template <class T>
struct is_polymorphic : public true_type-or-false_type {};
Inherits: If T is a (possibly cv-qualified)
polymorphic type then inherits from true_type,
otherwise inherits from false_type.
Type T must be a complete
type.
C++ Standard Reference: 10.3.
Compiler Compatibility: The implementation requires some knowledge of the compilers ABI, it does actually seem to work with the majority of compilers though.
Header: #include
<boost/type_traits/is_polymorphic.hpp>
or #include <boost/type_traits.hpp>
Examples:
Given:
class poly{ virtual ~poly(); };
is_polymorphic<poly>inherits fromtrue_type.
is_polymorphic<poly const>::typeis the typetrue_type.
is_polymorphic<poly>::valueis an integral constant expression that evaluates to true.
is_polymorphic<T>::value_typeis the typebool.