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I'm having trouble with this "strict weak ordering". Consider a class Point with members x and y. I tried to make the comparison "If both the x values are less than each other and the y values are less than each other, the Point's are less than each other". However, in the example below I create two points: (10,10) and (10,11) and the second insert fails.

Can someone please explain my blunder?

```
#include <iostream>
#include <set>
struct Point
{
float x,y;
};
struct MyComparison
{
bool operator()(const Point p1, const Point p2) const
{
if((p1.x < p2.x) && (p1.y < p2.y))
{
return true;
}
else
{
return false;
}
}
};
int main(int argc, char* argv[])
{
typedef std::set<Point, MyComparison> SetType;
SetType s;
std::pair<SetType::iterator, bool> result;
Point p1;
p1.x=10;
p1.y=10;
result = s.insert(p1);
std::cout << result.second << std::endl;
Point p2;
p2.x=10;
p2.y=11;
result = s.insert(p2);
std::cout << result.second << std::endl;
return 0;
}
```

Thanks,

David

*Edited 5 Years Ago by daviddoria*: n/a