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Resul's blog

Needs to be faster
By Resul, history, 9 years ago, In English

After I started to use <bits/stdc++.h> and C++11 my compiler is slowing down. Compilation finishes around 3secs. Is there any way to speed up? I use Ubuntu and Geany. [Sorry for bad English...]

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9 years ago, # |
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9 years ago, # |
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"There is no way to speed up compilation time" from the above comment is not correct. Many people use <bits/stdc++.h>, but few know the real purpose for this file: it is not there to save typing, it is there to save compilation time.

By using stdc++.h, you can create a precompiled header file that includes the whole standard library. Next time you run the compiler, it does not need to parse the standard library headers again — it just reads the precompiled header file instead.

You can read how to create and use the precompiled header here: https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_headers.html#manual.intro.using.headers.pre. After this, compilation time of an empty program should be significantly reduced.

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