Re: c++/4642: Very strange annoying warning about templates

Re: c++/4642: Very strange annoying warning about templates

[nathan]

Synopsis: Very strange annoying warning about templates

State-Changed-From-To: open->analyzed
State-Changed-By: nathan
State-Changed-When: Sun Sep 15 15:40:45 2002
State-Changed-Why:
    confirmed. This kind of thing would be suitable for a
    -Wlanguage-lawyer, which would normally be on.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=4642

Re: c++/4642: Very strange annoying warning about templates

[bangerth]

Synopsis: Very strange annoying warning about templates

State-Changed-From-To: analyzed->closed
State-Changed-By: bangerth
State-Changed-When: Wed Jan 22 19:42:53 2003
State-Changed-Why:
    Fixed with new parser

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=4642

c++/4642: Very strange annoying warning about templates

[khlebnikov]

>Number:         4642
>Category:       c++
>Synopsis:       Very strange annoying warning about templates
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          pessimizes-code
>Submitter-Id:   net
>Arrival-Date:   Mon Oct 22 01:36:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     G++
>Release:        any release I tried (includeing 2.95.4 and 3.0.2 prereleases)
>Organization:
>Environment:
Intel Pentium II (i686)
Debian GNU/Linux
>Description:
The compiler emits very strange warnings about rather clean code. These warnings are really annoying, because the file the compiler warns about is included in many other files (in my project). I've done stripped down testcase. The compiler doesn'e like that I've changed order of template parameters in line 11 from the line 10's order. It warns about every attempt to use the _TN type in line 12 or later. This results in two screens of useless warnings (in my code).
The command I give:
g++ -c error.cpp
The output I get:
error.cpp:13: warning: lookup of `_TN' finds `class _TN'
error.cpp:13: warning:   instead of `typename B<_NY,_TN>::_TN' from dependent base class
error.cpp:13: warning:   (use `typename B::_TN' if that's what you meant)
>How-To-Repeat:
g++ -c error.cpp
>Fix:
1) Change the order of template parameters in line 11.
2) Don't typedef "_TN" type (even private!) in the base class.
>Release-Note:
>Audit-Trail:
>Unformatted:
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