typeck.c (build_const_cast): Disallow use of const_cast to anything but a…

typeck.c (build_const_cast): Disallow use of const_cast to anything but a pointer or reference type.

	* typeck.c (build_const_cast): Disallow use of const_cast to
	anything but a pointer or reference type.

From-SVN: r26708

gcc/cp/ChangeLog

+1999-04-30  Mark Mitchell  <mark@codesourcery.com>
+
+	* typeck.c (build_const_cast): Disallow use of const_cast to
+	anything but a pointer or reference type.
+
 1999-04-30  Nathan Sidwell  <nathan@acm.org>
 
 	* decl.c (cp_finish_decl): Don't permit arrays of abstract or

gcc/cp/typeck.c

@@ -5633,6 +5633,14 @@ build_const_cast (type, expr)
   if (type == error_mark_node || expr == error_mark_node)
     return error_mark_node;
 
+  if (!POINTER_TYPE_P (type) && !TYPE_PTRMEMFUNC_P (type))
+    {
+      cp_error ("`%T' is not a pointer, reference, or pointer-to-member type",
+		type);
+      cp_error ("as required by const_cast");
+      return error_mark_node;
+    }
+
   if (TREE_CODE (expr) == OFFSET_REF)
     expr = resolve_offset_ref (expr);
 

gcc/testsuite/g++.old-deja/g++.other/cast2.C

+// Build don't link:
+// Origin: Mark Mitchell <mark@codesourcery.com>
+
+struct A {
+};
+
+int main()
+{
+  A a;
+  const_cast<const A>(a); // ERROR - const_cast requires pointer/ref types
+}