Re: PING: C++0x decltype patch

[Nathan Sidwell <nathan at codesourcery dot com>]

Doug Gregor wrote:
> It's been about two weeks since I submitted the latest decltype patch:
>
>  http://gcc.gnu.org/ml/gcc-patches/2007-07/msg01058.html
>
> Since then, decltype has been accepted into C++0x, in exactly the same
> form as it is implemented in the patch.
>
> Okay for mainline?
>
>  - Doug

Index: cp/semantics.c
+        case BIT_FIELD_REF:
+          sorry ("bit-field accesses in a decltype expression");
+          return error_mark_node;

+        default:
+          if (TYPE_P (expr) || DECL_P (expr))
+            error ("argument to decltype must be an expression");
+          else
+            sorry ("unhandled decltype expression kind: %s",
+                   tree_code_name[(int) TREE_CODE (expr)]);

why sorry and not gcc_assert or gcc_unreachable?

+      if (TREE_CODE (expr) == CALL_EXPR
+          && (fndecl = get_callee_fndecl (expr))
+          && (fndecl != error_mark_node))

+      else if ((type = is_bitfield_expr_with_lowered_type (expr)))

ow :)  can we avoid assignments in conditionals here?

Index: cp/parser.c
+static tree
+cp_parser_decltype (cp_parser *parser)

here you parse tentatively, but don't appear to be committing to the tentative 
parse when it succeeds.

Also, I can't see where decltype is gated on using c++0x extensions

nathan
--
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