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Why use #ifndef CLASS_H and #define CLASS_H in .h file but not in .cpp?
... your .cpp file, open any files #included by it, concatenate them all into one massive text file, and then perform syntax analysis and finally it will convert it to some intermediate code, optimize/perform other tasks, and finally generate the assembly output for the target architecture. Because of...
What is the point of a private pure virtual function?
... You can read more about it in his article "Virtuality".
There is however one more interesting thing in the code you presented, that deserves some more attention, in my opinion. The public interface consists of a set of overloaded non-virtual functions and those functions call non-public, non-overl...
Easy way to dismiss keyboard?
...rchy for the text field that is currently the first responder. If it finds one, it asks that text field to resign as first responder. If the force parameter is set to YES, the text field is never even asked; it is forced to resign." - so this is IMO the correct answer to the original question (use-c...
How can I assign an ID to a view programmatically?
...i++){
TextView tv = new TextView(this.getApplicationContext());
// One new TextView will also be assigned an id==12:
tv.setId(i);
placeholder.addView(tv);
}
So placeholder and one of our new TextViews both have an id of 12! But this isn't really a problem if we query placeholder's ...
Difference between Build Solution, Rebuild Solution, and Clean Solution in Visual Studio?
...ll clean and then build the solution from scratch, ignoring anything it's done before. The difference between this and "Clean, followed by Build" is that Rebuild will clean-then-build each project, one at a time, rather than cleaning all and then building all.
Clean solution will remove the build ar...
How to change the Push and Pop animations in a navigation based app
... fact you must write two different routines for inside animateTransition. One for the push, and one for the pop. Probably name them animatePush and animatePop. Inside animateTransition, just branch on popStyle to the two routines
The example below does a simple move-over/move-off
In your animate...
How to implement a ConfigurationSection with a ConfigurationElementCollection
...ep running up against exceptions that I do not understand. I am hoping someone can fill in the blanks here.
5 Answers
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How to compare two floating point numbers in Bash?
...
More conveniently
This can be done more conveniently using Bash's numeric context:
if (( $(echo "$num1 > $num2" |bc -l) )); then
…
fi
Explanation
Piping through the basic calculator command bc returns either 1 or 0.
The option -l is equivalent ...
Update Item to Revision vs Revert to Revision
... of data. Nothing is stopping me from changing the files. What if I change one of the files and try to commit it. Im guessing subversion is going to see the conflict and force me to merge the latest version in the repository into my modified working copy before I submit it.
– ...
Check if a number is int or float
... classes. isinstance checks if a given object is an instance of a class or one of that class's subclasses, so it's perfectly generic. Methinks that isinstance(obj, cls) is equivalent to issubclass(obj.__class__, cls)
– user395760
Dec 27 '10 at 19:33
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