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並前往https://www.qi-u.com/?qa=533238/c-obtain-a-std-ostream-either-from-std-cout-or-std-ofstream-file

Obtain a std::ostream either from std::cout or std::ofstream(file)

std ::streambuf * buf; std::ofstream of; if(!condition) { of.open("file.txt"); buf = of.rdbuf(); } else { buf = std::cout.rdbuf(); } std::ostream out(buf);.

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