magic Fundamentals Explained

PS: Static Investigation equipment like FindBugs and PMD detects the use of magic quantities as part of your code and implies the refactoring.

A magic quantity is really a sequence of people Firstly of a file structure, or protocol Trade. This amount serves as being a sanity check.

So by your definition, my respond to is most undoubtedly accurate. For the rest of us, it is a bit more iffy, mainly because the rest of us use "STL" to confer with a subset of your regular library, and There are a variety of ordinary library functions in C++eleven which involve compiler "magic". But is there overlap in between All those functions plus the "STL" part? I don't Assume so.

There is more than one which means. The 1 offered by most answers now (an arbitrary unnamed selection) is usually a quite common one particular, and The one thing I will say about that is that some people go to the intense of defining...

We've got two situations for our magic basic values. Only the next is of primary relevance for programmers and code:

mock magic solutions but you have to define them. MagicMock has "default implementations of a lot of the magic approaches.".

user2052437user2052437 17311 gold badge11 silver badge88 bronze badges 8 Stupid question, Have you ever restarted the command prompt AFTER you've included the DLL's magician to the PATH and BEFORE you executed the script? (foolish issue, since you definitely know your way around ctypes)

0 is likewise constructed to the X86 Guidelines to 'go strings competently'. Will save lots of microseconds.

People today sometimes consider magic variety elimination further more, by moving these constants into independent information to work as configuration. This is usually practical, but also can generate additional complexity than It is really worth.

One example is, You may have a magic amount of 0x12345678. If you see that magic number, it is a reasonable guess you're seeing a file of the correct structure. If you see, However, 0x78563412, it is a truthful guess that you're seeing an endian-swapped Variation of precisely the same file format.

Now my question is: is this real? Or are there aspects of the STL that cannot be applied in pure C++ and wish some "magic"/Specific compiler help?

A fast Verify in the magic number ahead of processing the file or information composition permits a person to signal faults early, as an alternative to schlep all the way by possibly prolonged processing as a way to announce that the input was complete balderdash.

I feel static remaining constants are overkill when you're making use of them in a single process. A last variable declared at the very best of the strategy is a lot more readable IMHO.

C++0x can take it a single stage further and offers versions of those sort traits that actually do the job effectively in all circumstances. And that may only be done by some unspecified kind of compiler assistance.