It is actually well worth noting that in some cases you do want non-configurable "really hard-coded" numbers with your code. There are a selection of famed kinds which includes 0x5F3759DF and that is used in the optimized inverse sq. root algorithm.
If by STL you indicate only the template portion of the C++ Normal Library, then it truly is properly probable to apply it with no "magic".
On the other hand, SO must have the ability to stand alone whether or not the rest of the World wide web disappears! By all indicates connection to a different source, but I choose to place some meat in The solution likewise.
Here "2" is a "magic" selection, that is factored out to some symbolic consistent default_padding in the context on the GUI UX of "my system" as a way to allow it to be use as default_padding quickly recognized from the increased context in the enclosing code.
0 is usually utilized by programmers to indicate that "very little went Mistaken" inside a routine's execution. It's the "not-an-exception" code worth. One can utilize it to indicate the lack of thrown exceptions.
It enhances readability in the code and It really is less difficult to keep up. Envision the case the place I established the scale of your password industry during the GUI. If I utilize a magic range, Each time the max measurement adjustments, I've to alter in two code areas. If I fail to remember a single, this can result in inconsistencies.
I argue that it's THE magic wand to rule them all in nearly each programmer's quiver of magic wands. Wrong is inevitably 0
The initial column strategies are operate very first, As soon as, prior to the infinite middle column is operate. The 3rd column of commands is operate after the infinite cycle, as soon as. It is vitally successful and logical when you finally get over the thought of an infinite loop.
Yet another benefit of extracting a magic quantity as a constant offers the possibility to obviously doc the organization information.
A basic principle that is connected to magic figures is that every simple fact your code offers with needs to be declared exactly the moment. If you use magic quantities inside your code (including the password size instance that @marcio gave, you can certainly wind up duplicating that point, and Whenever your fully grasp of that reality variations you've got a routine maintenance difficulty.
std::initializer_list wants compiler assistance and can't be reimplemented as A further course (so far as I realize), although I am undecided if it counts because it's in c++0x.
I've normally used the term "magic quantity" in a different way, as an obscure worth stored in a info construction which can be verified as a quick validity Verify. For instance gzip information have 0x1f8b08 as their 1st 3 bytes, Java course information begin with 0xcafebabe, and so forth.
I'm hoping to setup python-magic Krol for Home windows and I've adopted all the Directions in and repeated the method various situations but I am nonetheless finding this mistake:
To paraphrase, has everything been carried out to your compiler to allow for just a 'Specific case' the STL necessary to operate?