-//===-- Support/Casting.h - Allow flexible, checked, casts -------*- C++ -*--=//
+//===-- llvm/Support/Casting.h - Allow flexible, checked, casts -*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
//
// This file defines the isa<X>(), cast<X>(), dyn_cast<X>(), cast_or_null<X>(),
// and dyn_cast_or_null<X>() templates.
//
//===----------------------------------------------------------------------===//
-#ifndef SUPPORT_CASTING_H
-#define SUPPORT_CASTING_H
+#ifndef LLVM_SUPPORT_CASTING_H
+#define LLVM_SUPPORT_CASTING_H
+
+#include <cassert>
-#include <assert.h>
+namespace llvm {
//===----------------------------------------------------------------------===//
// isa<x> Support Templates
template<typename From> struct simplify_type<const From> {
typedef const From SimpleType;
static SimpleType &getSimplifiedValue(const From &Val) {
- return simplify_type<From>::getSimplifiedValue((From&)Val);
+ return simplify_type<From>::getSimplifiedValue(static_cast<From&>(Val));
}
};
// if (isa<Type*>(myVal)) { ... }
//
template <typename To, typename From>
-inline bool isa_impl(const From &Val) {
- return To::classof(&Val);
-}
+struct isa_impl {
+ static inline bool doit(const From &Val) {
+ return To::classof(&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
+ return isa_impl_cl<const SimpleType>::template
isa<To>(simplify_type<const From>::getSimplifiedValue(Val));
}
};
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>(Val);
+ return isa_impl<To,FromTy>::doit(Val);
}
};
// isa_impl_cl - Use class partial specialization to transform types to a single
-// cannonical form for isa_impl.
+// canonical form for isa_impl.
//
template<typename FromCl>
struct isa_impl_cl {
template<class To, class From>
struct cast_retty {
- typedef typename cast_retty_wrap<To, From,
+ typedef typename cast_retty_wrap<To, From,
typename simplify_type<From>::SimpleType>::ret_type ret_type;
};
template<class To, class FromTy> struct cast_convert_val<To,FromTy,FromTy> {
// This _is_ a simple type, just cast it.
static typename cast_retty<To, FromTy>::ret_type doit(const FromTy &Val) {
- return (typename cast_retty<To, FromTy>::ret_type)Val;
+ typename cast_retty<To, FromTy>::ret_type Res2
+ = (typename cast_retty<To, FromTy>::ret_type)const_cast<FromTy&>(Val);
+ return Res2;
}
};
//
template <class X, class Y>
inline typename cast_retty<X, Y>::ret_type cast(const Y &Val) {
- assert(isa<X>(Val) && "cast<Ty>() argument of uncompatible type!");
+ assert(isa<X>(Val) && "cast<Ty>() argument of incompatible type!");
return cast_convert_val<X, Y,
typename simplify_type<Y>::SimpleType>::doit(Val);
}
template <class X, class Y>
inline typename cast_retty<X, Y*>::ret_type cast_or_null(Y *Val) {
if (Val == 0) return 0;
- assert(isa<X>(Val) && "cast_or_null<Ty>() argument of uncompatible type!");
+ assert(isa<X>(Val) && "cast_or_null<Ty>() argument of incompatible type!");
return cast<X>(Val);
}
//
template <class X, class Y>
-inline typename cast_retty<X, Y>::ret_type dyn_cast(Y Val) {
+inline typename cast_retty<X, Y>::ret_type dyn_cast(const Y &Val) {
return isa<X>(Val) ? cast<X, Y>(Val) : 0;
}
// value is accepted.
//
template <class X, class Y>
-inline typename cast_retty<X, Y>::ret_type dyn_cast_or_null(Y Val) {
- return (Val && isa<X>(Val)) ? cast<X, Y>(Val) : 0;
+inline typename cast_retty<X, Y*>::ret_type dyn_cast_or_null(Y *Val) {
+ return (Val && isa<X>(Val)) ? cast<X>(Val) : 0;
}
-
-#ifdef DEBUG_CAST_OPERATORS
-#include <iostream>
-
-struct bar {
- bar() {}
-private:
- bar(const bar &);
-};
-struct foo {
- void ext() const;
- /* static bool classof(const bar *X) {
- cerr << "Classof: " << X << "\n";
- return true;
- }*/
-};
-
-template <> inline bool isa_impl<foo,bar>(const bar &Val) {
- cerr << "Classof: " << &Val << "\n";
- return true;
-}
-
-
-bar *fub();
-void test(bar &B1, const bar *B2) {
- // test various configurations of const
- const bar &B3 = B1;
- const bar *const B4 = B2;
-
- // test isa
- if (!isa<foo>(B1)) return;
- if (!isa<foo>(B2)) return;
- if (!isa<foo>(B3)) return;
- if (!isa<foo>(B4)) return;
-
- // test cast
- foo &F1 = cast<foo>(B1);
- const foo *F3 = cast<foo>(B2);
- const foo *F4 = cast<foo>(B2);
- const foo &F8 = cast<foo>(B3);
- const foo *F9 = cast<foo>(B4);
- foo *F10 = cast<foo>(fub());
-
- // test cast_or_null
- const foo *F11 = cast_or_null<foo>(B2);
- const foo *F12 = cast_or_null<foo>(B2);
- const foo *F13 = cast_or_null<foo>(B4);
- const foo *F14 = cast_or_null<foo>(fub()); // Shouldn't print.
-
- // These lines are errors...
- //foo *F20 = cast<foo>(B2); // Yields const foo*
- //foo &F21 = cast<foo>(B3); // Yields const foo&
- //foo *F22 = cast<foo>(B4); // Yields const foo*
- //foo &F23 = cast_or_null<foo>(B1);
- //const foo &F24 = cast_or_null<foo>(B3);
-}
-
-bar *fub() { return 0; }
-void main() {
- bar B;
- test(B, &B);
-}
-
-#endif
+} // End llvm namespace
#endif
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