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Diffstat (limited to 'libcult/cult/meta/polymorphic-p.hxx')
-rw-r--r-- | libcult/cult/meta/polymorphic-p.hxx | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/libcult/cult/meta/polymorphic-p.hxx b/libcult/cult/meta/polymorphic-p.hxx new file mode 100644 index 0000000..0743de3 --- /dev/null +++ b/libcult/cult/meta/polymorphic-p.hxx @@ -0,0 +1,56 @@ +// file : cult/meta/polymorphic-p.hxx +// author : Boris Kolpackov <boris@kolpackov.net> +// copyright : Copyright (c) 2005-2010 Boris Kolpackov +// license : GNU GPL v2 + exceptions; see accompanying LICENSE file + +#ifndef CULT_META_POLYMORPHIC_HXX +#define CULT_META_POLYMORPHIC_HXX + +#include <cult/types/fundamental.hxx> + +#include <cult/meta/class-p.hxx> +#include <cult/meta/remove-cv.hxx> + +namespace Cult +{ + namespace Meta + { + template <typename CVX> + class polymorphic_p + { + typedef typename remove_cv<CVX>::R X; + + template <typename Y, Boolean c> + struct impl + { + static const Boolean r = false; + }; + + template <typename Y> + struct impl<Y, true> + { + //@@ private + + struct S1 : Y + { + S1 (); + }; + + struct S2 : Y + { + S2 (); + + virtual + ~S2 () throw (); + }; + + static const Boolean r = sizeof (S1) == sizeof (S2); + }; + + public: + static const Boolean r = impl<X, class_p<X>::r>::r; + }; + } +} + +#endif // CULT_META_POLYMORPHIC_HXX |