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From "Martin Sebor (JIRA)" <j...@apache.org>
Subject [jira] Commented: (STDCXX-605) [IBM XLC++] errors compiling dynatype.cpp
Date Sat, 08 Dec 2007 00:20:43 GMT

    [ https://issues.apache.org/jira/browse/STDCXX-605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12549616
] 

Martin Sebor commented on STDCXX-605:
-------------------------------------

I assume (1) is because of the compiler bug?

For (2) yes, if we can't have static_cast<T>(v) because of the XLC++ bug I'd rather
see static_cast<const T&>(v). The problem, as I understand it, is that we're invoking
the conversion operator on a non-const dynatype object and thus operator T&() rather than
operator const T&() const is being invoked. I wonder if there's a way to detect that the
caller is invoking a const T& cast and dispatch to a const member function instead...

(3) Yes. I'm saying I think the output of the example should match the code (and use '\n'
instead of std::endl).

(4) We should try. Is the difference due to unspecified behavior or another compiler bug?
(Have fun reading the relevant sections of the standard! ;-)

> [IBM XLC++] errors compiling dynatype.cpp
> -----------------------------------------
>
>                 Key: STDCXX-605
>                 URL: https://issues.apache.org/jira/browse/STDCXX-605
>             Project: C++ Standard Library
>          Issue Type: Bug
>          Components: Examples
>    Affects Versions: 4.2.0
>         Environment: XLC++ 6.0 through 9.0/AIX 5.3
>            Reporter: Martin Sebor
>            Assignee: Travis Vitek
>             Fix For: 4.2.1
>
>         Attachments: stdcxx-605.patch
>
>
> The dynatype.cpp example program fails to compile with IBM XLC++ 9.0 on AIX with ethe
following errors:
> xlCcore_r -c -I$(TOPDIR)/include/ansi    -I$(TOPDIR)/include -I$(BUILDDIR)/include -I$(TOPDIR)/examples/include
 -O -Q     -qtemplateregistry=dynatype.ti $(TOPDIR)/examples/tutorial/dynatype.cpp
> "$(TOPDIR)/examples/tutorial/dynatype.cpp", line 203.27: 1540-0216 (S) An expression
of type "dynatype" cannot be converted to type "int".
> "$(TOPDIR)/examples/tutorial/dynatype.cpp", line 209.30: 1540-0216 (S) An expression
of type "dynatype" cannot be converted to type "double".
> "$(TOPDIR)/examples/tutorial/dynatype.cpp", line 215.30: 1540-0216 (S) An expression
of type "dynatype" cannot be converted to type "double".
> "$(TOPDIR)/examples/tutorial/dynatype.cpp", line 222.35: 1540-0216 (S) An expression
of type "dynatype" cannot be converted to type "const char *".
> "$(TOPDIR)/examples/tutorial/dynatype.cpp", line 228.35: 1540-0216 (S) An expression
of type "dynatype" cannot be converted to type "const char *".
> "$(TOPDIR)/examples/tutorial/dynatype.cpp", line 238.28: 1540-0216 (S) An expression
of type "dynatype" cannot be converted to type "char".
> gmake: *** [dynatype.o] Error 1

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