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Add some type traits that are used for Clang's statically-checked
canonical types. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78076 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -49,6 +49,33 @@ struct is_class
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enum { value = sizeof(char) == sizeof(dont_use::is_class_helper<T>(0)) };
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};
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// enable_if_c - Enable/disable a template based on a metafunction
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template<bool Cond, typename T = void>
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struct enable_if_c {
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typedef T type;
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};
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template<typename T> struct enable_if_c<false, T> { };
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// enable_if - Enable/disable a template based on a metafunction
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template<typename Cond, typename T = void>
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struct enable_if : public enable_if_c<Cond::value, T> { };
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namespace dont_use {
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template<typename Base> char base_of_helper(const volatile Base*);
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template<typename Base> double base_of_helper(...);
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}
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/// is_base_of - Metafunction to determine whether one type is a base class of
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/// (or identical to) another type.
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template<typename Base, typename Derived>
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struct is_base_of {
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static const bool value
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= is_class<Base>::value && is_class<Derived>::value &&
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sizeof(char) == sizeof(dont_use::base_of_helper<Base>((Derived*)0));
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};
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}
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#endif
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