Patchwork [C++,testcase] PR 52744

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Submitter Paolo Carlini
Date Oct. 12, 2012, 8:31 a.m.
Message ID <5077D57D.5050505@oracle.com>
Download mbox | patch
Permalink /patch/191071/
State New
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Comments

Paolo Carlini - Oct. 12, 2012, 8:31 a.m.
Hi,

testcase committed, PR closed as fixed in mainline. Tested x86_64-linux.

Thanks,
Paolo.

////////////////////
2012-10-12  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/52744
	* g++.dg/cpp0x/pr52744.C: New.

Patch

Index: g++.dg/cpp0x/pr52744.C
===================================================================
--- g++.dg/cpp0x/pr52744.C	(revision 0)
+++ g++.dg/cpp0x/pr52744.C	(working copy)
@@ -0,0 +1,83 @@ 
+// PR c++/52744
+// { dg-do compile { target c++11 } }
+
+struct T
+{
+  int a;
+  void b(){}
+  int c(int)
+  {
+    return 1;
+    }
+};
+
+template<typename CT, CT> struct member_helper;
+
+template<typename FT, FT(T::*mem)>
+struct member_helper<FT(T::*), mem>
+{
+  static const char* worker()
+  {
+    return "for members";
+  }
+};
+
+template<typename Return, typename... Args, Return(T::*fun)(Args...)>
+struct member_helper<Return(T::*)(Args...), fun>
+{
+  static const char* worker()
+  {
+    return "for member functions returning non void";
+  }
+};
+
+template<typename... Args, void(T::*fun)(Args...)>
+struct member_helper<void(T::*)(Args...), fun>
+{
+  static const char* worker()
+  {
+    return "for member functions returning void";
+  }
+};
+
+void member_test()
+{
+  member_helper<decltype(&T::a), &T::a>::worker();
+  member_helper<decltype(&T::b), &T::b>::worker();
+  member_helper<decltype(&T::c), &T::c>::worker();
+}
+
+typedef void lua_State;
+
+template<typename T, T> class function_helper
+{
+  static_assert(sizeof(T) != sizeof(T),
+		"Error: function_helper works with functions (duh)");
+};
+
+template<typename Return, typename... Args, Return(*func)(Args...)>
+struct function_helper<Return(*)(Args...), func>
+{
+  static int wrapper(lua_State* l)
+  {
+    return 1;
+  }
+};
+
+template<typename... Args, void(*func)(Args...)>
+struct function_helper<void(*)(Args...), func>
+{
+  static int wrapper(lua_State* l)
+  {
+    return 0;
+  }
+};
+
+int ciao(int){ return 0; }
+void ciao2(int){}
+
+void function_test()
+{
+  function_helper<decltype(&ciao), &ciao>::wrapper(0);
+  function_helper<decltype(&ciao2), &ciao2>::wrapper(0);
+}