When deciding whether to catch the exception, especially one thrown during construction, ask yourself a very simple question, if you do catch it can you still leave the class in a usable state? If the answer is yes, then by all means catch it, deal with it and allow construction to continue. If the answer is no then do not catch it! Why? Simple! if you catch and swallow it, how is the code that was attempting to construct your class to know that the class is unusable (or, at least only partially constructed)? Continue reading
You’re implementing a beautiful class. It’s just wonderful – the most perfect code you’ve ever written, except… for some reason it keeps crashing and you don’t know why. You’ve debugged the code and discovered it happens when your class goes out of scope and needs to throw an exception from the destructor. Tested in isolation, this works fine but integrated into the main code base it causes a crash. You know there are exception handlers that should deal with this and yet it still crashes. This doesn’t make sense. Why is the crashing? Continue reading
In C++ all arguments are passed to functions by value. In other words, a copy of the value is taken and that is what the function has to work with. If you want to modify the original value you must either pass a pointer or reference to the original value you wish to modify. Of course, even the pointer or reference are still passed by value. Pointers and references are just another C++ type and when they are passed around you do so by value. Continue reading
C is Not C++!!!
A superset of nothing useful
I often hear those who really should know better giving the advice that before you learn to code in C++ you should first learn to code in C. At face value this would seem like reasonable advice; after all C++ is a superset of C and so by learning C you’ll be learning some of C++. Unfortunately, this advice overlooks some fundamental but very important differences between C and C++ that may very well damage the learning curve of the student. Continue reading
Has a website abused your privacy, been a little too carefree with your password details or just plain stupid with their password policy? Let shame-on.it know and they’ll name and shame them for you! Continue reading
Since the introduction of the STL (Standard Template Library) the use of functors has been a prevalent part of writing C++. Most of the STL algorithms require the use of a functor. For example, the std::transform requires a function object that, given an input of the current value of the current position, it will return a new value what will be used to modify the current value.
Hey everyone (I assume someone reads this blog), it’s been a while since my last blog post. I have no real excuse other than to say I decided I need to take a little personal time to recharge my batteries. I’m back now and will be aiming to publish a new technical article on a weekly basis. Meanwhile, I’ve also decided to resurrect my Tumblr account (currently, it just redirects here). Continue reading