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From "Martin Sebor (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (STDCXX-84) std::fill_n() assumes Size can be decremented
Date Fri, 09 Dec 2005 01:27:09 GMT
     [ http://issues.apache.org/jira/browse/STDCXX-84?page=all ]
     
Martin Sebor resolved STDCXX-84:
--------------------------------

    Resolution: Fixed

Resolved. Will close when a test has been added to the test suite.

> std::fill_n() assumes Size can be decremented
> ---------------------------------------------
>
>          Key: STDCXX-84
>          URL: http://issues.apache.org/jira/browse/STDCXX-84
>      Project: STDCXX
>         Type: Bug
>   Components: 25. Algorithms
>     Versions: 4.1.2
>  Environment: all
>     Reporter: Martin Sebor
>     Assignee: Martin Sebor
>     Priority: Minor
>      Fix For: 4.1.3

>
> The requirement on the Size template argument to std::fill_n() in lib.alg.fill, p3 is
that it be convertible to an integral type which does not imply that it be possible to decrement
or otherwise modify its value. I.e., the program below is expected to compile successfully.

> $ cat t.cpp && nice make t
> #include <algorithm>
> struct Size {
>     operator int() { return 0; }
> private:
>     void operator=(Size&);
> };
> template void std::fill_n (int*, Size, const int&);
> int main () { }
> eccp -c -I/build/sebor/dev/stdlib/include/ansi -D_RWSTDDEBUG    -D_RWSTD_USE_CONFIG -I/build/sebor/eccp-3.6-11s/include
-I/build/sebor/dev/stdlib/include -I/build/sebor/dev/stdlib/../rwtest -I/build/sebor/dev/stdlib/../rwtest/include
-I/build/sebor/dev/stdlib/tests/include  -A -x --template_directory=/build/sebor/eccp-3.6-11s/lib
-g  --display_error_number --remarks --diag_suppress 193,236,340,401,261,479,487,678,679,815
 t.cpp
> "/build/sebor/dev/stdlib/include/rw/_algobase.h", line 132: error #349: no
>           operator "--" matches these operands
>             operand types are: -- Size
>       for (;__n > 0;--__n, ++__first)
>                     ^
>           detected during instantiation of "void std::fill_n(_OutputIter,
>                     _Size, const _TypeT &) [with _OutputIter=int *,
>                     _Size=Size, _TypeT=int]" at line 9 of "t.cpp"
> 1 error detected in the compilation of "t.cpp".
> make: *** [t.o] Error 2

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