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Date: Thu, 8 Dec 2005 21:06:10 +0100 (CET)
From: "Martin Sebor (JIRA)" <jira@apache.org>
To: stdcxx-dev@incubator.apache.org
Subject: [jira] Resolved: (STDCXX-83) std::generate_n() assumes Size can be
 decremented
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     [ http://issues.apache.org/jira/browse/STDCXX-83?page=all ]
     
Martin Sebor resolved STDCXX-83:
--------------------------------

    Resolution: Fixed

Fixed and test case added with the referenced changes.

> std::generate_n() assumes Size can be decremented
> -------------------------------------------------
>
>          Key: STDCXX-83
>          URL: http://issues.apache.org/jira/browse/STDCXX-83
>      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::generate_n() in lib.alg.generate, p2 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::generate_n (int*, Size, 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/algorithm", line 431: error #349: no operator
>           "--" matches these operands
>             operand types are: -- Size
>       for (; __n > 0; --__n, ++__first)
>                       ^
>           detected during instantiation of "void std::generate_n(_OutputIter,
>                     _Size, _Generator) [with _OutputIter=int *, _Size=Size,
>                     _Generator=int (*)()]" at line 9 of "t.cpp"
> 1 error detected in the compilation of "t.cpp".

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