// isa<x> Support Templates
//===----------------------------------------------------------------------===//
-template<typename FromCl> struct isa_impl_cl;
-
// Define a template that can be specialized by smart pointers to reflect the
// fact that they are automatically dereferenced, and are not involved with the
// template selection process... the default implementation is a noop.
}
};
-
-// isa<X> - Return true if the parameter to the template is an instance of the
-// template type argument. Used like this:
-//
-// if (isa<Type*>(myVal)) { ... }
-//
+// The core of the implementation of isa<X> is here; To and From should be
+// the names of classes. This template can be specialized to customize the
+// implementation of isa<> without rewriting it from scratch.
template <typename To, typename From>
struct isa_impl {
static inline bool doit(const From &Val) {
}
};
-template<typename To, typename From, typename SimpleType>
-struct isa_impl_wrap {
- // When From != SimplifiedType, we can simplify the type some more by using
- // the simplify_type template.
- static bool doit(const From &Val) {
- return isa_impl_cl<const SimpleType>::template
- isa<To>(simplify_type<const From>::getSimplifiedValue(Val));
+template <typename To, typename From> struct isa_impl_cl {
+ static inline bool doit(const From &Val) {
+ return isa_impl<To, From>::doit(Val);
}
};
-template<typename To, typename FromTy>
-struct isa_impl_wrap<To, const FromTy, const FromTy> {
- // When From == SimpleType, we are as simple as we are going to get.
- static bool doit(const FromTy &Val) {
- return isa_impl<To,FromTy>::doit(Val);
+template <typename To, typename From> struct isa_impl_cl<To, const From> {
+ static inline bool doit(const From &Val) {
+ return isa_impl<To, From>::doit(Val);
}
};
-// isa_impl_cl - Use class partial specialization to transform types to a single
-// canonical form for isa_impl.
-//
-template<typename FromCl>
-struct isa_impl_cl {
- template<class ToCl>
- static bool isa(const FromCl &Val) {
- return isa_impl_wrap<ToCl,const FromCl,
- typename simplify_type<const FromCl>::SimpleType>::doit(Val);
+template <typename To, typename From> struct isa_impl_cl<To, From*> {
+ static inline bool doit(const From *Val) {
+ return isa_impl<To, From>::doit(*Val);
}
};
-// Specialization used to strip const qualifiers off of the FromCl type...
-template<typename FromCl>
-struct isa_impl_cl<const FromCl> {
- template<class ToCl>
- static bool isa(const FromCl &Val) {
- return isa_impl_cl<FromCl>::template isa<ToCl>(Val);
+template <typename To, typename From> struct isa_impl_cl<To, const From*> {
+ static inline bool doit(const From *Val) {
+ return isa_impl<To, From>::doit(*Val);
}
};
-// Define pointer traits in terms of base traits...
-template<class FromCl>
-struct isa_impl_cl<FromCl*> {
- template<class ToCl>
- static bool isa(FromCl *Val) {
- return isa_impl_cl<FromCl>::template isa<ToCl>(*Val);
+template <typename To, typename From> struct isa_impl_cl<To, const From*const> {
+ static inline bool doit(const From *Val) {
+ return isa_impl<To, From>::doit(*Val);
}
};
-// Define reference traits in terms of base traits...
-template<class FromCl>
-struct isa_impl_cl<FromCl&> {
- template<class ToCl>
- static bool isa(FromCl &Val) {
- return isa_impl_cl<FromCl>::template isa<ToCl>(&Val);
+template<typename To, typename From, typename SimpleFrom>
+struct isa_impl_wrap {
+ // When From != SimplifiedType, we can simplify the type some more by using
+ // the simplify_type template.
+ static bool doit(const From &Val) {
+ return isa_impl_wrap<To, SimpleFrom,
+ typename simplify_type<SimpleFrom>::SimpleType>::doit(
+ simplify_type<From>::getSimplifiedValue(Val));
+ }
+};
+
+template<typename To, typename FromTy>
+struct isa_impl_wrap<To, FromTy, FromTy> {
+ // When From == SimpleType, we are as simple as we are going to get.
+ static bool doit(const FromTy &Val) {
+ return isa_impl_cl<To,FromTy>::doit(Val);
}
};
+// isa<X> - Return true if the parameter to the template is an instance of the
+// template type argument. Used like this:
+//
+// if (isa<Type>(myVal)) { ... }
+//
template <class X, class Y>
inline bool isa(const Y &Val) {
- return isa_impl_cl<Y>::template isa<X>(Val);
+ return isa_impl_wrap<X, Y, typename simplify_type<Y>::SimpleType>::doit(Val);
}
//===----------------------------------------------------------------------===//