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From "Martin Sebor (JIRA)" <>
Subject [jira] Created: (STDCXX-83) std::generate_n() assumes Size can be decremented
Date Wed, 07 Dec 2005 21:43:10 GMT
std::generate_n() assumes Size can be decremented

         Key: STDCXX-83
     Project: STDCXX
        Type: Bug
  Components: 25. Algorithms  
    Versions: 4.1.2    
 Environment: all
    Reporter: Martin Sebor
 Assigned to: 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; }
    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
"/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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