lower_bound == upper_bound

Question

What does lower_bound mean. If I had to guess I would answer that this function returns the iterator at the last element that is less than the value asked for. But I see tha

Answer 1

Auch!

Did you change the original code or is the copy-paste error in there since day one?

float operator()(double f)
{
    SpectrumPoint* l=std::lower_bound//...
...
    SpectrumPoint* u=std::lower_bound//...
...
}

In the code I read today you are assigning lower_bound to both 'l' and 'u'.