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What is the use of “ref” for reference-type variables in C#?

I understand that if I pass a value-type ( int , struct , etc.) as a parameter (without the ref keyword), a copy of that variable is passed to the method, but if I use the ref keyword a reference to that variable is passed, not a new one. ...
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What’s the best way to check if a file exists in C++? (cross platform)

I have read the answers for What's the best way to check if a file exists in C? (cross platform) , but I'm wondering if there is a better way to do this using standard c++ libs? Preferably without trying to open the file at all. ...
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What is a singleton in C#?

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What are JavaScript's builtin strings?

this question is difficult to summarize in a question title 7 Answers 7 ...
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Compiling with cython and mingw produces gcc: error: unrecognized command line option '-mno-cygwin'

I'm trying to compile a python extension with cython in win 7 64-bit using mingw (64-bit). I'm working with Python 2.6 (Active Python 2.6.6) and with the adequate distutils.cfg file (setting mingw as the compiler) ...
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How to run a PowerShell script from a batch file

I am trying to run this script in PowerShell. I have saved the below script as ps.ps1 on my desktop. 8 Answers ...
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How to generate a git patch for a specific commit?

I need to write a script that creates patches for a list of SHA1 commit numbers. 10 Answers ...
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How to clear the cache in NetBeans

I created a project in NetBeans, and I would like to clear the NetBeans cache. 13 Answers ...
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Where to put include statements, header or source?

Should I put the includes in the header file or the source file? If the header file contains the include statements, then if I include that header file in my source, then will my source file have all of the included files that were in my header? Or should I just include them in my source file only? ...
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How to check command line parameter in “.bat” file?

My OS is Windows Vista. I need to have a ".bat" file where I need to check if user enters any command-line parameter or not. If does then if the parameter equals to -b then I will do something otherwise I will flag "Invalid input". If user does not enter any command-line parameter then I will d...