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What is your favorite C programming trick? [closed]

... C99 offers some really cool stuff using anonymous arrays: Removing pointless variables { int yes=1; setsockopt(yourSocket, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)); } becomes setsockopt(yourSocket, SOL_SOCKET, SO_REUSEADDR...
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What are the calling conventions for UNIX & Linux system calls (and user-space functions) on i386 an

Following links explain x86-32 system call conventions for both UNIX (BSD flavor) & Linux: 4 Answers ...
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What is the formal difference in Scala between braces and parentheses, and when should they be used?

...ut this, but I gave up in the end, as the rules are somewhat diffuse. Basically, you’ll have to get the hang of it. Perhaps it is best to concentrate on where curly braces and parenthesis can be used interchangeably: when passing parameters to method calls. You may replace parenthesis with curly b...
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How can I transform between the two styles of public key format, one “BEGIN RSA PUBLIC KEY”, the oth

...s of two numbers: the modulus (e.g. a 2,048 bit number) the exponent (usually 65,537) Using your RSA public key as an example, the two numbers are: Modulus: 297,056,429,939,040,947,991,047,334,197,581,225,628,107,021,573,849,359,042,679,698,093,131,908,015,712,695,688,944,173,317,630,555,849,7...
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__lt__ instead of __cmp__

...ttributes of the new class it's decorating (the result might be microscopically faster at runtime, at equally minute cost in terms of memory). Of course, if your class has some particularly fast way to implement (e.g.) __eq__ and __ne__, it should define them directly so the mixin's versions are no...
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Include all existing fields and add new fields to document

...t aggregation stage where I can instruct it to add a new field and include all existing fields, without having to list all the existing fields. ...
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How do you do Impersonation in .NET?

...asy WindowsIdentity.Impersonate Method (check out the code samples) Basically you will be leveraging these classes that are out of the box in the .NET framework: WindowsImpersonationContext WindowsIdentity The code can often get lengthy though and that is why you see many examples like the on...
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How do you do a limit query in JPQL or HQL?

...QL Parser, and it's a lot less forgiving. I think Query.setMaxResults() really is your only option. share | improve this answer | follow | ...
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AngularJS HTTP post to PHP and undefined

...send that as data. Make sure that this query string is URL encoded. If manually built (as opposed to using something like jQuery.serialize()), Javascript's encodeURIComponent() should do the trick for you. share | ...
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Django: ImproperlyConfigured: The SECRET_KEY setting must not be empty

... Refactor to avoid circular dependency. The exact solution is really fairly specific to your own code. – Sam Svenbjorgchristiensensen Feb 17 '14 at 22:10 6 ...