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How to implement the factory method pattern in C++ correctly

... First of all, there are cases when object construction is a task complex enough to justify its extraction to another class. I believe this point is incorrect. The complexity doesn't really matter. The relevance is what does. I...
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How do I do a not equal in Django queryset filtering?

... Your query appears to have a double negative, you want to exclude all rows where x is not 5, so in other words you want to include all rows where x IS 5. I believe this will do the trick. results = Model.objects.filter(x=5).exclude(a=true) To answer your specific question, there is no "...
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How to check whether a script is running under Node.js?

...ly thing commonJS specifies is that A: The modules will be included via a call to the function require and B: The modules exports things via properties on the exports object. Now how that is implement is left to the underlying system. Node.js wraps the module's content in an anonymous function: fun...
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What is your single most favorite command-line trick using Bash? [closed]

We all know how to use <ctrl>-R to reverse search through history, but did you know you can use <ctrl>-S to forward search if you set stty stop "" ? Also, have you ever tried running bind -p to see all of your keyboard shortcuts listed? There are over 455 on Mac OS X by default. ...
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How to initialize a vector in C++ [duplicate]

...p;arr[0]+N; } And then you can do this without having to repeat the size all over: int vv[] = { 12,43 }; std::vector<int> v(begin(vv), end(vv)); share | improve this answer | ...
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Cleaner way to update nested structures

...scalaz.TreeLoc). It turns out that the structure of the zipper is automatically derivable from the original data structure, in a manner that resembles symbolic differentiation of an algebraic expression. But how does this help you with your Scala case classes? Well, Lukas Rytz recently prototyped a...
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Are there any standard exit status codes in Linux?

...ld died with 11" */ } How are you determining the exit status? Traditionally, the shell only stores an 8-bit return code, but sets the high bit if the process was abnormally terminated. $ sh -c 'exit 42'; echo $? 42 $ sh -c 'kill -SEGV $$'; echo $? Segmentation fault 139 $ expr 139 - 128 11 I...
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How to call Base Class's __init__ method from the child class? [duplicate]

... If you pass BaseClass to super, it'll skip over BaseClass and call object.__init__, which is almost certainly not what you want. – abarnert Oct 6 '13 at 7:29 1 ...
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Create a tag in a GitHub repository

...m the official Linux Kernel Git documentation for git push: --tags All refs under refs/tags are pushed, in addition to refspecs explicitly listed on the command line. Or if you just want to push a single tag: git push origin <tag> See also my answer to How do you push a tag to a r...
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Literal suffix for byte in .NET?

...e var, you can always cast the byte as in var y = (byte) 5 Although not really related, in C#7, a new binary prefix was introduced 0b, which states the number is in binary format. Still there is no suffix to make it a byte though, example: var b = 0b1010_1011_1100_1101_1110_1111; //int ...