CODEWITHSUNDEEP
c++cperformance
aleyasin
aleyasin

Reputation: 37

c++ quick read & write from standard input

How I can improve speeds of read & write the data from standard input (terminal) in c/c++ code?

I use:

ios::sync_with_stdio_false();

Does any way exist to do that quicker?

Upvotes: 0

Views: 234

Answers (1)

Potatoswatter
Potatoswatter

Reputation: 137830

Obtain std::streambuf references from std::cin.rdbuf() and std::cout.rdbuf(). (Yes, it's still called rdbuf even when used for output.) Most of the slowdown in iostream occurs in the formatting functionality.

You will have to parse the bytes yourself.

As with anything performance-related, don't believe, assume, or suppose anything that doesn't come directly from profiling a run on a realistic dataset.

By the way, all bets are off if cin or cout are connected to any kind of terminal. The resulting graphical operations and I/O from cout will bring the machine to its knees before your program gets a chance to run, and for cin you would have to be a pretty fast typist.

Upvotes: 1

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