std::valarray::operator[](std::gslice) bad result
-------------------------------------------------

                 Key: STDCXX-309
                 URL: http://issues.apache.org/jira/browse/STDCXX-309
             Project: C++ Standard Library
          Issue Type: Bug
          Components: 26. Numerics
    Affects Versions: 4.1.2, 4.1.3
         Environment: all
            Reporter: Martin Sebor
         Assigned To: Martin Sebor
             Fix For: 4.2


The program below aborts at runtime with the latest trunk:

$ cat t.cpp && nice gmake t && ./t
#include <cassert>
#include <cstddef>
#include <valarray>

int main ()
{
    const int a[] = { 1, 2, 3, 4, 5, 6 };

    const std::valarray<int> v (a, sizeof a / sizeof *a);

    const std::size_t          start = 5;
    std::valarray<std::size_t> length (1, 1);
    std::valarray<std::size_t> stride (1, 1);

    const std::gslice gsl (start, length, stride);

    const std::valarray<int> vsl = v [gsl];

    assert (a [start] == vsl [0]);
}
aCC -c -I/nfs/devco/sebor/dev/stdlib/include/ansi -I/usr/include  -D_RWSTDDEBUG   -mt -D_RWSTD_USE_CONFIG -I/nfs/devco/sebor/dev/stdlib/include -I/build/sebor/aCC-3.70-15S/include -I/nfs/devco/sebor/dev/stdlib/examples/include  -Aa +nostl  -g +d  +DD64 +w +W392 +W655 +W684 +W818 +W819 +W849   t.cpp
aCC t.o -o t -Aa +nostl -Wl,+s -Wl,+vnocompatwarnings   -mt +DD64 -L/build/sebor/aCC-3.70-15S/lib -lstd15S   -lm 
Assertion failed: a [start] == vsl [0], file t.cpp, line 19
ABORT instruction (core dumped)


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