1 files changed, 83 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/template/sfinae6.C b/gcc/testsuite/g++.dg/template/sfinae6.C
new file mode 100644
index 000000000..64567aae2
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/sfinae6.C
@@ -0,0 +1,83 @@
+// DR 339
+//
+// Test of the use of the function call operator with SFINAE
+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> { };
+
+template<typename F, typename T1, typename T2>
+  typename enable_if<sizeof(create_a<F>()(create_a<T1>(), create_a<T2>()), 1),
+		     yes_type>::type
+  check_is_callable2(type<F>, type<T1>, type<T2>);
+
+no_type check_is_callable2(...);
+
+template<typename F, typename T1, typename T2 = T1>
+struct is_callable2
+{
+  static const bool value = 
+    (sizeof(check_is_callable2(type<F>(), type<T1>(), type<T2>()))
+     == sizeof(yes_type));
+};
+
+#define JOIN( X, Y ) DO_JOIN( X, Y )
+#define DO_JOIN( X, Y ) DO_JOIN2(X,Y)
+#define DO_JOIN2( X, Y ) X##Y
+
+#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
+
+
+struct A;
+struct B;
+
+struct A {
+  A(B);
+};
+
+struct B {
+  B(A);
+};
+
+struct F1 { };
+
+struct F2 {
+  bool operator()(int, float);
+};
+
+struct F3 {
+  bool operator()(int);
+};
+
+struct F4 {
+  void operator()(A, A);
+  void operator()(B, B);
+};
+
+struct F5 {
+  void operator()(A, A);
+
+private:
+  void operator()(B, B);
+};
+
+STATIC_ASSERT((is_callable2<int(*)(int, int), long, int>::value));
+STATIC_ASSERT((!is_callable2<int(*)(int, int), int*, int>::value));
+STATIC_ASSERT((!is_callable2<F1, int, int>::value));
+STATIC_ASSERT((is_callable2<F2, int, int>::value));
+STATIC_ASSERT((!is_callable2<F2, int*, int>::value));
+STATIC_ASSERT((!is_callable2<F3, int, int>::value));
+STATIC_ASSERT((is_callable2<F4, A, A>::value));
+STATIC_ASSERT((is_callable2<F4, B, B>::value));
+STATIC_ASSERT((!is_callable2<F4, A, B>::value));
+STATIC_ASSERT((is_callable2<F5, A, A>::value));
+STATIC_ASSERT((!is_callable2<F5, A, B>::value));