Re: problem with C++ sort algorithm

From:

"Greg Herlihy" <greghe@pacbell.net>

Newsgroups:

comp.lang.c++.moderated

Date:

15 Aug 2006 09:18:31 -0400

Message-ID:

<1155609904.531310.239830@h48g2000cwc.googlegroups.com>

jo_atman@yahoo.com wrote:

Folks,
This strange problem is now solved, thanks to a programming illiterate
(but very sharp OR guy) at work. I guess showing you guys my compare
method would have helped you point it out too:

bool compareByCloseAndAlloc( State* s1, State* s2 )
{
   int retVal = s2->getPDClose() - s1->getPDClose();
   if ( retVal != 0 ) return retVal < 0;
   return s1->getAllocation() - s2->getAllocation();
}

This problem is implementing this routine as if it were strcmp() and
having it return a -1, 0, or 1 depending on the relative order of the
operands. The actual requirement for this method is more simple:
returns true if the left operand is less than the right - and return
false in all other cases. Implemented with strcmp() behavior, the
function behaves nonsensically: reporting that a < b and b < a are both
true whenever a != b.

A more compact implementation would simply be:

  bool compareByCloseAndAlloc( State* s1, State* s2 )
  {
    return s1->getPDClose() < s2->getPDClose() ?
           true : s1->getPDClose() > s2->getPDClose() ?
           false : s1->getAllocation() < s2->getAllocation();
  }

I still honestly believe i did no wrong (i thought in C++, 0 was false,
every other number in the universe means true). before we close this
inane topic, maybe someone could clarify?

Yes, 0 converts to false - all other integer values to true.

Greg

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