title: how to get rid of -std=c++17 in g++ command line?
body: <p>I have encountered an error, saying that std::size() is not a member of std. Then I found this link: <a href="https://stackoverflow.com/questions/55194309/why-stdsize-is-not-a-member-of-std-in-gcc-8-2-0">Why std::size() is not a member of std in gcc 8.2.0</a> Eventually, my code works well after I compile the file with <code>g++ -std=c++17 myFile.cpp</code>. Now, I tried <code>g++ -std=c++17 6.cpp -o - 6.out</code> as the previous link suggested, and it did not work. Any comments?</p>