obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.

1 files changed, 86 insertions, 0 deletions

diff --git a/gcc/testsuite/g++.dg/template/sfinae13.C b/gcc/testsuite/g++.dg/template/sfinae13.C
new file mode 100644
index 000000000..b659685d8
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/sfinae13.C
@@ -0,0 +1,86 @@
+// DR 339
+//
+// Test of the use of casts with SFINAE
+
+// Boilerplate helpers
+typedef char yes_type;
+struct no_type { char data[2]; };
+
+template<typename T> T create_a();
+template<typename T> struct type { };
+
+template<bool, typename T = void> struct enable_if { typedef T type; };
+template<typename T> struct enable_if<false, T> { };
+
+#define JOIN( X, Y ) DO_JOIN( X, Y )
+#define DO_JOIN( X, Y ) DO_JOIN2(X,Y)
+#define DO_JOIN2( X, Y ) X##Y
+
+#define CHECK_CAST(CastKind)                                            \
+template<typename T, typename U>                                        \
+ typename enable_if<(sizeof((JOIN(CastKind,_cast)<U>(create_a<T>())), 0) > 0), \
+                   yes_type>::type                                      \
+  JOIN(check_,JOIN(CastKind,_cast))(int);                               \
+                                                                        \
+template<typename T, typename U>                                        \
+  no_type JOIN(check_,JOIN(CastKind,_cast))(...);                       \
+                                                                        \
+template<typename T, typename U>                                        \
+struct JOIN(has_,JOIN(CastKind,_cast))                                  \
+{                                                                       \
+  static const bool value =                                             \
+    (sizeof(JOIN(check_,JOIN(CastKind,_cast))<T, U>(0)) == sizeof(yes_type)); \
+}
+
+template<typename T, typename U>
+typename enable_if<(sizeof(((U)create_a<T>()), 0) > 0), yes_type>::type
+  check_c_cast(int);
+                                                            
+template<typename T, typename U> no_type check_c_cast(...);
+                                                            
+template<typename T, typename U>
+struct has_c_cast
+{
+  static const bool value =
+    (sizeof(check_c_cast<T, U>(0)) == sizeof(yes_type));
+};
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+#  define STATIC_ASSERT(Expr) static_assert(Expr, #Expr)
+#else
+#  define STATIC_ASSERT(Expr) int JOIN(a,__LINE__)[Expr? 1 : -1]
+#endif
+
+CHECK_CAST(static);
+CHECK_CAST(dynamic);
+CHECK_CAST(const);
+CHECK_CAST(reinterpret);
+
+struct X { virtual void f(); };
+struct Y { operator bool(); };
+struct Z : public X { };
+
+STATIC_ASSERT((has_static_cast<int, float>::value));
+STATIC_ASSERT((!has_static_cast<X, Y>::value));
+STATIC_ASSERT((has_static_cast<Z, X>::value));
+
+STATIC_ASSERT(!(has_dynamic_cast<int, float>::value));
+STATIC_ASSERT(!(has_dynamic_cast<X, Y>::value));
+STATIC_ASSERT(!(has_dynamic_cast<X, Z>::value));
+STATIC_ASSERT(!(has_dynamic_cast<Y, Z>::value));
+STATIC_ASSERT((has_dynamic_cast<X*, Z*>::value));
+STATIC_ASSERT((has_dynamic_cast<X*, Y*>::value));
+STATIC_ASSERT(!(has_dynamic_cast<Y*, Z*>::value));
+
+STATIC_ASSERT(!(has_const_cast<int, float>::value));
+STATIC_ASSERT((has_const_cast<const int*, int*>::value));
+STATIC_ASSERT((has_const_cast<int*, const int*>::value));
+STATIC_ASSERT(!(has_const_cast<const int*, float*>::value));
+
+STATIC_ASSERT((has_reinterpret_cast<int*, float*>::value));
+STATIC_ASSERT(!(has_reinterpret_cast<void*, char>::value));
+STATIC_ASSERT(!(has_reinterpret_cast<const X, X>::value));
+
+STATIC_ASSERT((has_c_cast<int, float>::value));
+STATIC_ASSERT(!(has_c_cast<X, Y>::value));
+STATIC_ASSERT(!(has_c_cast<void*, char>::value));