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Revert r78424.

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In order for the changes in r78424 to work properly, cast_retty<X,Y> should return an object instead of a reference, and it's not clear that this approach has real advantages.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79023 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Argyrios Kyrtzidis 2009-08-14 19:01:37 +00:00
parent bba9f5f378
commit 9a0b165cb5
1 changed files with 4 additions and 7 deletions
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11
include/llvm/Support/Casting.h
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@ -205,9 +205,8 @@ inline typename cast_retty<X, Y>::ret_type cast(const Y &Val) {
// accepted.
//
template <class X, class Y>
inline typename cast_retty<X, Y>::ret_type cast_or_null(const Y &Val) {
typedef typename cast_retty<X, Y>::ret_type ret_type;
if (!Val) return ret_type();
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 incompatible type!");
return cast<X>(Val);
}
@ -223,8 +222,7 @@ inline typename cast_retty<X, Y>::ret_type cast_or_null(const Y &Val) {
template <class X, class Y>
inline typename cast_retty<X, Y>::ret_type dyn_cast(const Y &Val) {
typedef typename cast_retty<X, Y>::ret_type ret_type;
return isa<X>(Val) ? cast<X, Y>(Val) : (ret_type)ret_type();
return isa<X>(Val) ? cast<X, Y>(Val) : 0;
}
// dyn_cast_or_null<X> - Functionally identical to dyn_cast, except that a null
@ -232,8 +230,7 @@ inline typename cast_retty<X, Y>::ret_type dyn_cast(const Y &Val) {
//
template <class X, class Y>
inline typename cast_retty<X, Y>::ret_type dyn_cast_or_null(const Y &Val) {
typedef typename cast_retty<X, Y>::ret_type ret_type;
return (Val && isa<X>(Val)) ? cast<X, Y>(Val) : (ret_type)ret_type();
return (Val && isa<X>(Val)) ? cast<X, Y>(Val) : 0;
}