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c++/8596: Base class template list not checked at point of declaration
- From: bangerth at ticam dot utexas dot edu
- To: gcc-gnats at gcc dot gnu dot org
- Date: 16 Nov 2002 01:20:40 -0000
- Subject: c++/8596: Base class template list not checked at point of declaration
- Reply-to: bangerth at ticam dot utexas dot edu
>Number: 8596
>Category: c++
>Synopsis: Base class template list not checked at point of declaration
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: accepts-illegal
>Submitter-Id: net
>Arrival-Date: Fri Nov 15 17:26:01 PST 2002
>Closed-Date:
>Last-Modified:
>Originator: Wolfgang Bangerth
>Release: unknown-1.0
>Organization:
>Environment:
3.3 CVS and 3.2.1 pre
>Description:
In playing with PR 3907, I found that this compiles:
------------------------------
template <int s> struct U {};
template <int s> struct C : U<zs_zs_zs>{};
------------------------------
Is this supposed to work? I could not find anything in
the standard, but I'm surprised it compiles cleanly.
Of course I cannot instantiate C, since zs_zs_zs is not
known.
Further playing tells me that this has something to do
with (the non-existence of)two-stage name lookup, since
this compiles:
--------------------------
template <int s> struct U {};
template <int s> struct C : U<zs_zs_zs>{};
const int zs_zs_zs = 3;
C<1> c1;
--------------------------
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted: