[ 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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