re PR c++/3716 (Template parameters that are pointers to member functions)

cp:
	PR c++/3716
	* pt.c (tsubst_aggr_type): Move pmf handling into tsubst.
	(tsubst, case POINTER_TYPE): Handle pmfs here.
	(tsubst, case OFFSET_TYPE): Check it is not an offset to
	reference. If it is offset to FUNCTION_TYPE, create a METHOD_TYPE.
testsuite:
	* g++.dg/template/ptrmem1.C: New test.
	* g++.dg/template/ptrmem2.C: New test.

From-SVN: r48471

gcc/cp/ChangeLog

 2002-01-02  Nathan Sidwell  <nathan@codesourcery.com>
 
+	PR c++/3716
+	* pt.c (tsubst_aggr_type): Move pmf handling into tsubst.
+	(tsubst, case POINTER_TYPE): Handle pmfs here.
+	(tsubst, case OFFSET_TYPE): Check it is not an offset to
+	reference. If it is offset to FUNCTION_TYPE, create a METHOD_TYPE.
+
+2002-01-02  Nathan Sidwell  <nathan@codesourcery.com>
+
 	PR c++/35
 	* cp-tree.h (DECL_LANG_FLAG_0): Used for PARM_DECL too.
 	(DECL_TEMPLATE_PARM_P): A PARM_DECL might be one too.

gcc/cp/pt.c

@@ -5452,12 +5452,7 @@ tsubst_aggr_type (t, args, complain, in_decl, entering_scope)
     {
     case RECORD_TYPE:
       if (TYPE_PTRMEMFUNC_P (t))
-	{
-	  tree r = build_ptrmemfunc_type
-	    (tsubst (TYPE_PTRMEMFUNC_FN_TYPE (t), args, complain, in_decl));
-	  return cp_build_qualified_type_real (r, TYPE_QUALS (t),
-					       complain);
-	}
+	return tsubst (TYPE_PTRMEMFUNC_FN_TYPE (t), args, complain, in_decl);
 
       /* else fall through */
     case ENUMERAL_TYPE:
@@ -6150,7 +6145,7 @@ tsubst_function_type (t, args, complain, in_decl)
   /* The TYPE_CONTEXT is not used for function/method types.  */
   my_friendly_assert (TYPE_CONTEXT (t) == NULL_TREE, 0);
 
-  /* Substitue the return type.  */
+  /* Substitute the return type.  */
   return_type = tsubst (TREE_TYPE (t), args, complain, in_decl);
   if (return_type == error_mark_node)
     return error_mark_node;
@@ -6565,7 +6560,7 @@ tsubst (t, args, complain, in_decl)
       {
 	enum tree_code code;
 
-	if (type == TREE_TYPE (t))
+	if (type == TREE_TYPE (t) && TREE_CODE (type) != METHOD_TYPE)
 	  return t;
 
 	code = TREE_CODE (t);
@@ -6604,7 +6599,11 @@ tsubst (t, args, complain, in_decl)
 	    return error_mark_node;
 	  }
 	else if (code == POINTER_TYPE)
-	  r = build_pointer_type (type);
+	  {
+	    r = build_pointer_type (type);
+	    if (TREE_CODE (type) == METHOD_TYPE)
+	      r = build_ptrmemfunc_type (r);
+	  }
 	else
 	  r = build_reference_type (type);
 	r = cp_build_qualified_type_real (r, TYPE_QUALS (t), complain);
@@ -6632,7 +6631,30 @@ tsubst (t, args, complain, in_decl)
 			r);
 	    return error_mark_node;
 	  }
-	return build_offset_type (r, type);
+	if (TREE_CODE (type) == REFERENCE_TYPE)
+	  {
+	    if (complain)
+	      error ("creating pointer to member reference type `%T'", type);
+	    
+	    return error_mark_node;
+	  }
+	my_friendly_assert (TREE_CODE (type) != METHOD_TYPE, 20011231);
+	if (TREE_CODE (type) == FUNCTION_TYPE)
+	  /* This is really a method type. The cv qualifiers of the
+	     this pointer should _not_ be determined by the cv
+	     qualifiers of the class type.  They should be held
+	     somewhere in the FUNCTION_TYPE, but we don't do that at
+	     the moment.  Consider
+	        typedef void (Func) () const;
+
+		template <typename T1> void Foo (Func T1::*);
+
+	      */
+	  return build_cplus_method_type (TYPE_MAIN_VARIANT (r),
+					  TREE_TYPE (type),
+					  TYPE_ARG_TYPES (type));
+	else
+	  return build_offset_type (r, type);
       }
     case FUNCTION_TYPE:
     case METHOD_TYPE:

gcc/testsuite/ChangeLog

 2002-01-02  Nathan Sidwell  <nathan@codesourcery.com>
 
+	* g++.dg/template/ptrmem1.C: New test.
+	* g++.dg/template/ptrmem2.C: New test.
+
 	* g++.dg/template/ntp.C: New test.
 
 	* g++.dg/other/component1.C: New test.

gcc/testsuite/g++.dg/template/ptrmem1.C

+// { dg-do compile }
+
+// Copyright (C) 2001 Free Software Foundation, Inc.
+// Contributed by Nathan Sidwell 31 Dec 2001 <nathan@codesourcery.com>
+
+// PR 3716 tsubsting a pointer to member function did not create a
+// pointer to member function.
+
+template <class C, class T, T C::*M>
+struct Closure
+{
+  T operator() (C & c) const { return (c.*M); }
+};
+
+template <class C, class T, T (C::* M)()>
+struct Closure<C, T (), M>
+{
+  T operator()(C & c) const { return (c.*M)(); }
+};
+
+struct A
+{
+  int get();
+};
+  
+static Closure<A, int (), & A::get> get_closure;
+
+
+void Foo ()
+{
+  A a;
+  get_closure (a);
+}

gcc/testsuite/g++.dg/template/ptrmem2.C

+// { dg-do compile }
+
+// Copyright (C) 2001 Free Software Foundation, Inc.
+// Contributed by Nathan Sidwell 31 Dec 2001 <nathan@codesourcery.com>
+
+// We'd tsubst a pointer to member reference
+
+struct A {};
+
+template <typename T> T A::* Foo ();
+
+void Baz ()
+{
+  Foo <int &> (); // { dg-error "no matching function" "" }
+}