IndexOf bug or misuse?

Question

Qt

Here is the code:

QString fakePath="c:/test/test.mp3";
int pos = fakePath.indexOf(QString("."),-1);
qDebug("pos=%d\n",pos);

Here is what is written in the documentation:

If from is -1, the search starts at the last character; if it is -2, at the next to last character and so on.

The result is always -1. Who knows what's the matter?
Tested on Qt 4.8.0 Qt 4.7.4

Answer 1

indexOf searches for an occurrence starting at the position specified by the second argument. She is always looking forward, i.e. to the right. Because you set the initial position to -1, then it will search starting from the character "3" and further to the right. Naturally, there is no point there and the function will rightly return -1 (not found).
And what, in fact, did you expect the result with such arguments?