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From "Martin Sebor (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (STDCXX-693) std::valarray::sum does not work correctly for udt that has nonzero default value
Date Mon, 02 Jun 2008 18:43:46 GMT

     [ https://issues.apache.org/jira/browse/STDCXX-693?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Martin Sebor reassigned STDCXX-693:
-----------------------------------

    Assignee: Martin Sebor

> std::valarray::sum does not work correctly for udt that has nonzero default value
> ---------------------------------------------------------------------------------
>
>                 Key: STDCXX-693
>                 URL: https://issues.apache.org/jira/browse/STDCXX-693
>             Project: C++ Standard Library
>          Issue Type: Bug
>          Components: 26. Numerics
>    Affects Versions: 4.2.0, 4.2.1
>            Reporter: Travis Vitek
>            Assignee: Martin Sebor
>            Priority: Minor
>             Fix For: 4.3
>
>
> #include <cassert>
> #include <valarray>
> struct S
> {
>     // this ctor should not be required
>     S ()
>         : value (21)
>     {
>     }
>     S (int v)
>         : value (v)
>     {
>     }
>     S (const S& rhs)
>         : value (rhs.value)
>     {
>     }
>     S& operator+= (const S& rhs)
>     {
>         value += rhs.value;
>         return *this;
>     }
>     int value;
> };
> int main ()
> {
>     const std::valarray<S> b (S (10), 1); // 10 elements with value 1
>     assert (b.sum ().value == 10);
>     return 0;
> } 
> The wording in the standard seems to imply that the returned value should be a copy of
one of the elements, and that op+= should be called on all of the other elements. If this
is the case, then this an additional issue that would be detectable in user code [the user
can count how many times the op+= is invoked]. This issue may apply to the min() and max()
methods as well.

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