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What is the worst real-world macros/pre-processor abuse you've ever come across?

What is the worst real-world macros/pre-processor abuse you've ever come across (please no contrived IOCCC answers *haha*)? ...
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JSON formatter in C#?

...ne breaks and indentations. Validation would be a bonus, but isn't necessary, and I don't need to parse it into an object or anything. ...
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What are type lambdas in Scala and what are their benefits?

Sometime I stumble into the semi-mysterious notation of 4 Answers 4 ...
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Can I install Python 3.x and 2.x on the same Windows computer?

I'm running Windows and the shell/OS automatically runs Python based on the registry settings when you run a program on the command line. Will this break if I install a 2.x and 3.x version of Python on the same machine? ...
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Why should text files end with a newline?

I assume everyone here is familiar with the adage that all text files should end with a newline. I've known of this "rule" for years but I've always wondered — why? ...
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ORA-30926: unable to get a stable set of rows in the source tables

... This is usually caused by duplicates in the query specified in USING clause. This probably means that TABLE_A is a parent table and the same ROWID is returned several times. You could quickly solve the problem by using a DISTINCT in your ...
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void in C# generics?

... You cannot use void, but you can use object: it is a little inconvenience because your would-be-void functions need to return null, but if it unifies your code, it should be a small price to pay. This inability to use void a...
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Bash continuation lines

How do you use bash continuation lines? 11 Answers 11 ...
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What does the ??!??! operator do in C?

... ??! is a trigraph that translates to |. So it says: !ErrorHasOccured() || HandleError(); which, due to short circuiting, is equivalent to: if (ErrorHasOccured()) HandleError(); Guru of the Week (deals with C++ but relevant here), where I picked this up. Possible...
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How to count number of files in each directory?

I am able to list all the directories by 17 Answers 17 ...