https://en.cppreference.com/w/cpp/language/if if statement - cppreference.com Conditionally executes another statement. Used where code needs to be executed based on a run-time or compile-time (since C++17) condition, or whether the if statement is evaluated in a manifestly constant-evaluated context (since C++23). [edit] Syntax att en.cppreference.com C++17 부터 추가된 기능으로, 실행 전 빌드 할 때에 해당 구문을 평가하여..