1 files changed, 47 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/testsuite/g++.dg/template/sfinae12.C b/gcc-4.9/gcc/testsuite/g++.dg/template/sfinae12.C
new file mode 100644
index 000000000..c51211be2
--- /dev/null
+++ b/gcc-4.9/gcc/testsuite/g++.dg/template/sfinae12.C
@@ -0,0 +1,47 @@
+// DR 339
+//
+// Test of the use of the ternary operator 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
+
+template<typename T, typename U, typename V>
+typename enable_if<
+           (sizeof((create_a<T>()? create_a<U>() : create_a<V>()), 0) > 0),
+           yes_type>::type
+  check_ternary(int);
+                                                            
+template<typename T, typename U, typename V> no_type check_ternary(...);
+                                                            
+template<typename T, typename U, typename V>
+struct has_ternary
+{
+  static const bool value =
+    (sizeof(check_ternary<T, U, V>(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
+
+struct X { };
+struct Y { operator bool(); };
+
+STATIC_ASSERT((has_ternary<int, float, double>::value));
+STATIC_ASSERT((has_ternary<bool, double, double>::value));
+STATIC_ASSERT((!has_ternary<int, float*, double>::value));
+STATIC_ASSERT((!has_ternary<X, double, double>::value));
+STATIC_ASSERT((has_ternary<Y, double, double>::value));