Solving #109 with redundant inclusion guards#110
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jmramosr wants to merge 19 commits intohanickadot:mainfrom
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Solving #109 with redundant inclusion guards#110jmramosr wants to merge 19 commits intohanickadot:mainfrom
jmramosr wants to merge 19 commits intohanickadot:mainfrom
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To reduce compilation time explodes in ctre.hpp
To reduce compilation time explodes
To reduce compilation time explodes
To reduce compilation time explodes
added CTRE_V2__CTLL__HPP redundant guard
To reduce compilation time explodes
To reduce compilation time explodes
To reduce compilation time explodes
To reduce compilation time explodes
To reduce compilation time explodes
To reduce compilation time explodes
To reduce compilation time explodes
To reduce compilation time explodes
To reduce compilation time explodes
To reduce compilation time explodes
To reduce compilation time explodes
Owner
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Do you have some measurements? This seems really sketchy. |
Owner
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Ok, I read the book on pages you sent, the chapter is talking about preprocessor, not about templates. |
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Using redundant include guards to minimize the compilation time
C Preprocessor inclusions could explode the compilation time (even with pragma once!)
The basic idea comes from an old, dusty C++ book called Large Scale C++ Software Design, page 83-88.
Expanding the
evaluatemethod indicated in the issue #109, everytime the?in0?1?2?3?4?5?6?7?8?9?is parsed, a new template instantiation begins, reading all the files again in the#includes, and increasing exponentially the compilation time.I didn't use any redundant include guards in the standard header files. They could be used into them, too, in order to reduce even more the compilation times.
Test case:
0?1?2?3?4?5?6?7?8?9?Even worst compile time test case:
a?b?c?d?e?f?g?h?i?j?l?m?n?o?p?q?r?s?t?u?v?w?x?y?z?