Giant_on_weed's blog

Why do most people comment out pbds code in their template
By Giant_on_weed, history, 3 years ago, In English

I am just curious if there will be a problem if I don't if I keep PBDS code uncommented in my template. Can it cause slow execution time or something like that? Also, in case if anyone knows, why isn't ordered set already included in C++ STL library, it there some problems it can cause in real world applications?

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3 years ago, # |
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I don't use it at all because I've seen it being the reason for solutions not passing due to it being somewhat slow.

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3 years ago, # |
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I think it's just because some people don't like to include something they don't use in their code.

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3 years ago, # |
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No including PBDS in your code does not slows execution time but it will increase compilation time. Ordered Set is not included in C++ STL because it is not a part of C++ STL , it's a part of GNU based Policy based data structures and is present in GCC only.

The reasons I can think of why most people comment PBDS code in their template are

  • It increases compilation time.
  • On some versions of MinGW the name of file is very weird something like hash_standard_resize_policy_imp.hpp0000644 and on including #include<ext/pb_ds/assoc_container.hpp> in their code throws the error Error was "cannot open source file hash_standard_resize_policy_imp.hpp ". so they don't bother with it and simply comment it out.
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