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When I am reading design goals of C++11, it mentioned about zero-overhead principle without any examples or features which uses this principle. I can understand that it could be there to avoid degrading existing code performance. But,
Can someone explain this concept with some examples?
Approach they made to implement such a feature in the standard?
How they enforce compiler-writers to implement this?
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I often hear that C++ templates are Turing complete. What does it mean?
My previous search lead me to links [1] and [2] which are good but they do not answer what I am asking.
it's capable of expressing general recursion by simply using templates that refer to themselves and using template specialization for making decisions.
Is recursion and and making decision equivalent to Turing completeness?
Could someone please break down the requirements of Turing completeness in the programming aspect (not from the computer science aspect)?
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Is there is any specific reason behind undefined behavior in C and C++?
Why are some features left undefined?
For some part at least, it was to allow a more efficient implementation.
A simple example: Function parameters. Their evaluation order in unspecifed, because some architectures could work better depending on how they made the calculations or the calling convention (registers, stack, etc.)
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I'm trying to understand in a simple raytracer what does the BSDF function does and in theory I got it but in practice I don't know how to implement one.
Can someone point me out some simple examples (well-explained if possible) on how to use it?
check PBRT project. It is great book, but if you do not want to read it, there is well documented source code availabe: PBRT
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What are the advantages of C++ over the others languages in working with videodata and videodevices (developing object detection program). Thank you.
for object detection, you could use python, matlab, java and c++. You have to use c++ if you need substantially speed improvement (C++ is the fastest in most of the cases). You could also use OpenCv easily with c++ for face and object detection.
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Are there alternatives that would be more preferred?
Short-circuit evaluation is a crucial feature of most modern programming languages and there's no reason to avoid relying on it. Without it pointer-related tests would be (unnecessarily) much more complicated and less readable.
Of course it's good design, everyone knows to expect it and it beats using nested conditionals.