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Remove unncessary <iostream> include - #52
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Including iostream means introducing the static (global) constructors and destructors for std::cin, std::cerr, and std::cout. That extra init and fini code is undesirable when those streams are not actually used.
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Including
<iostream>means introducing the static (global) constructors and destructors forstd::cin,std::cerr, andstd::cout. That extrainitandfinicode is undesirable when those streams are not actually used.(See https://en.cppreference.com/w/cpp/io/ios_base/Init for details.)