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Add some type traits that are used for Clang's statically-checked

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canonical types.

llvm-svn: 78076
This commit is contained in:
Douglas Gregor 2009-08-04 17:04:52 +00:00
parent d840bf2eac
commit 60425b2194
1 changed files with 27 additions and 0 deletions
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27
include/llvm/Support/type_traits.h
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@ -49,6 +49,33 @@ struct is_class
enum { value = sizeof(char) == sizeof(dont_use::is_class_helper<T>(0)) };
};
// enable_if_c - Enable/disable a template based on a metafunction
template<bool Cond, typename T = void>
struct enable_if_c {
typedef T type;
};
template<typename T> struct enable_if_c<false, T> { };
// enable_if - Enable/disable a template based on a metafunction
template<typename Cond, typename T = void>
struct enable_if : public enable_if_c<Cond::value, T> { };
namespace dont_use {
template<typename Base> char base_of_helper(const volatile Base*);
template<typename Base> double base_of_helper(...);
}
/// is_base_of - Metafunction to determine whether one type is a base class of
/// (or identical to) another type.
template<typename Base, typename Derived>
struct is_base_of {
static const bool value
= is_class<Base>::value && is_class<Derived>::value &&
sizeof(char) == sizeof(dont_use::base_of_helper<Base>((Derived*)0));
};
}
#endif