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Why are preprocessor macros evil and what are the alternatives?

...ved a really good answer; I think that almost any programmer before even writing the first "Hello World" had encountered a phrase like "macro should never be used", "macro are evil" and so on, my question is: why? With the new C++11 is there a real alternative after so many years? ...
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How to sort a dataframe by multiple column(s)

I want to sort a data.frame by multiple columns. For example, with the data.frame below I would like to sort by column z (descending) then by column b (ascending): ...
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How to recursively delete an entire directory with PowerShell 2.0?

What is the simplest way to forcefully delete a directory and all its subdirectories in PowerShell? I am using PowerShell V2 in Windows 7. ...
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Is non-blocking I/O really faster than multi-threaded blocking I/O? How?

...antage of nonblocking or asynchronous I/O is that your thread can continue its work in parallel. Of course you can achieve this also using an additional thread. As you stated for best overall (system) performance I guess it would be better to use asynchronous I/O and not multiple threads (so reducin...
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Intel HAXM installation error - This computer does not support Intel Virtualization Technology (VT-x

I have an issue with my HAXM installation. Here is the thing. I got this error every single time I tried to install HAXM for my computer: ...
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The transaction log for the database is full

...uire lots of space for the log file, I created a second log file and made it huge. Once the project is complete we then removed the extra log file. share | improve this answer | ...
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Simulating tremor (from e.g. Parkinson's Disease) with the mouse on a webpage?

I'm working for a foundation that raises awareness for accessibility in the internet. For a presentation, we want to offer a small workshop that simulates different disabilities/impairments to people. This is done via a website created especially for this presentation. ...
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Relative imports in Python 3

... unfortunately, this module needs to be inside the package, and it also needs to be runnable as a script, sometimes. Any idea how I could achieve that? It's quite common to have a layout like this... main.py mypackage/ __init__.py mymodule.py myothermodule.py ...with ...
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Why Response.Redirect causes System.Threading.ThreadAbortException?

... The correct pattern is to call the Redirect overload with endResponse=false and make a call to tell the IIS pipeline that it should advance directly to the EndRequest stage once you return control: Response.Redirect(url, false); Context.ApplicationInstance.CompleteRequest(); ...
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Importing from builtin library when module with same name exists

Situation: - There is a module in my project_folder called calendar - I would like to use the built-in Calendar class from the Python libraries - When I use from calendar import Calendar it complains because it's trying to load from my module. ...