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Why does C++ need a separate header file?

...ile with the same functions as in the .cpp file. It makes creating classes and refactoring them very difficult, and it adds unnecessary files to the project. And then there is the problem with having to include header files, but having to explicitly check if it has already been included. ...
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What are the benefits of dependency injection containers?

I understand benefits of dependency injection itself. Let's take Spring for instance. I also understand benefits of other Spring featureslike AOP, helpers of different kinds, etc. I'm just wondering, what are the benefits of XML configuration such as: ...
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Understanding __get__ and __set__ and Python descriptors

I am trying to understand what Python's descriptors are and what they are useful for. I understand how they work, but here are my doubts. Consider the following code: ...
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Practical uses of different data structures [closed]

...k about data structures, but I can't find a simple list of data structures and their practical use out there. I'm trying to study for an interview and I think this would help me out, along with many others. I'm looking for something like this: ...
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git merge: apply changes to code that moved to a different file

... git did not notice that the code in the new file was the same as the old, and so none of my changes are there. 3 Answers...
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What is unit testing? [closed]

...to unit test in a specific language, but no question asking 'what', 'why', and 'when'. 20 Answers ...
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How to implement a queue with three stacks?

...stion in an algorithms book ( Algorithms, 4th Edition by Robert Sedgewick and Kevin Wayne). 5 Answers ...
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Comparison of CI Servers? [closed]

...of different continuous integration (CI) Servers (esp. focusing on .NET) and couldn't find any. 13 Answers ...
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master branch and 'origin/master' have diverged, how to 'undiverge' branches'?

Somehow my master and my origin/master branch have diverged. I actually don't want them to diverge. 13 Answers ...
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Virtual functions and performance - C++

In my class design, I use abstract classes and virtual functions extensively. I had a feeling that virtual functions affects the performance. Is this true? But I think this performance difference is not noticeable and looks like I am doing premature optimization. Right? ...