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Text formatting
https://en.cppreference.com/w/cpp/utility/format
왜?
printf 의 직관성을 유지하면서 안전한 게 필요했다.
i/o stream 의 라이브러리를 보완한다.
std::format
https://tango1202.github.io/cpp-stl/modern-cpp-stl-formatting/
제공된 인수에 대한 유효한 형식 문자열이 아닌 경우 std::format_error
할당 실패 시 std::bad_alloc을 발생
std::format_to, std::format_to_n, std::formatted_size
std::vformat
가변적으로 문자열 구성 가능
에러는 std::format 과 마찬가지로 런타임에 발생

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[C++ 20] [P0645R10] Text formatting 내용 정리