Re: std::sort causes segfault when sorting class arrays

"Victor Bazarov" <>
Sun, 1 Mar 2009 15:00:25 -0500
Juha Nieminen wrote:

Kai-Uwe Bux wrote:

Well, I just had this program:

#include <iostream>
#include <iomanip>
#include <cmath>

using namespace std;

int main ( void ) {
  double x = 1;
  double y = 1;
    << boolalpha
    << ( sin(x)+cos(y) == sin(x)+cos(y) ) << '\n';

and the output was "false".

 I honestly can't understand what's happening there. Even if it's
changed to this:

#include <iostream>
#include <iomanip>
#include <cmath>

double f(double x, double y)
   return std::sin(x) + std::cos(y);

int main ( void ) {
 double x = 1;
 double y = 1;
 std::cout << std::boolalpha
           << ( f(x, y) == f(x, y) ) << std::endl;

it still prints false. [..]

I don't know what you're talking about, guys. I just took your
code, plugged it into my test project, compiled, ran, and got
'true'. Changed FP settings, changed to optimized, same thing.
Maybe Visual C++ 2008 is wrong somehow, and I am supposed to get

What compiler, what hardware? Can you post the assembly?

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