Often you need to search through an array or list to find a specific element and of course you need this search to be as fast and efficient as possible. One of the best ways to do this is using a binary predicate function. A binary function is a function object (which are also called Functors ) and is any object which can be called as if it was a function....
If you are on Linux and want to print some code and also make it look pretty then check out a2ps (Any to postscript filter). Of course if you can avoid printing in the first place and saving paper and trees and make it greener that is ideal - however there are times that is not possible. I tried printing from CDT, but the printing options from CDT just looks plain ugly and big fonts and can spread over 10 pages for a simple code file (spanning 293 lines)....
I came across the Ten commandments of Programming while looking at a question on StackOverflow and I can’t believe I have not seen these before. I think every developer, lead, architect, dba, pm, whoever should print this out! 8-) Understand and accept that you will make mistakes. The point is to find them early, before they make it into production. Fortunately, except for the few of us developing rocket guidance software at JPL, mistakes are rarely fatal in our industry, so we can, and should, learn, laugh, and move on....
Here is a good example on why either you love C++ or hate it with such terse expression oriented code; I think its pretty cool. If you want to copy one string to another, one option can be something like this. 1 2 3 4 5 6 void mycopy(char *p, char *q) { int len = strlen(q); for(int i=0; i<=len; i++) p[i] = q[i]; } However this achieves the same thing as above and is more efficient:...
If you ever got an error something like [some-class] has initialiser but incomplete type, it basically means the compiler cannot understand the type and you need to add the include for it. 1 2 3 4 5 QPixmap pixmap(20,10); pixmap.fill(Qt::white); QPainter painter(&pixmap); QPen pen(Qt::blue); Take the code snipped above when you compile it you might get an error something along the lines of the following for line 4. ‘QPainter painter’ has initialiser but incomplete type...
If you are new to C++ then some of the compiler errors can be a bit confusing and daunting at first. For example if the compiler given you an expected primary-expression error (e.g. expected primary-expression before ‘.’ token), at face value it does not make sense. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 void RGBViewer::accept() { QMessageBox::information(this, "Button Clicked", "You clicked OK", QMessageBox::Ok); QColor color = QColor(Ui_RGBViewerClass....