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Date: Wed, 12 Feb 2003 22:16:00 -0000
From: dens@stl.sarov.ru
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To: gcc-gnats@gcc.gnu.org
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Subject: libstdc++/9679: Strange behaviour of valarray::apply method
X-SW-Source: 2003-02/txt/msg00542.txt.bz2
List-Id: <gcc-prs.sourceware.org>


>Number:         9679
>Category:       libstdc++
>Synopsis:       Strange behaviour of valarray::apply method
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Feb 12 22:16:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     dens@stl.sarov.ru
>Release:        libstdc++-3.2-7
>Organization:
>Environment:
cat /etc/issue
Red Hat Linux release 8.0 (Psyche)
Kernel \r on an \m

g++ --version
g++ (GCC) 3.2 20020903 (Red Hat Linux 8.0 3.2-7)
>Description:
There is very strange(for me) behaviour of apply method of valarray:

#include <valarray>
#include <string.h>
char bar(char arg)
{
    return tolower(arg);
}

char foo(char * x)
{
    return toupper(*x);
}

int main(void)
{
        char * str = new char[7];
        strcpy(str,"STRING");

        std::valarray<char> y(str, 6);
///   Strange behaviour    
        char some = foo(&(y.apply(bar)[0]));
        return 0;
}

If I understood correctly then apply method should return valarray<char> object which operator [] should return reference to char (char &). (C++ standard 26.3.2.3 and 26.3.2.7 8.)

But in our case this operator returns non-lvalue and I can't get it address. It is very strange for me.
>How-To-Repeat:
Try to compile attached sample
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
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