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並前往https://zh-blog.logan.tw/2020/07/05/cxx-17-has-include-expression/

C++ 17 __has_include 前置處理表達式 - 羅根學習筆記

#if __has_include("example.h") #include "example.h" #else #error ... g++ -std=c++17 example.cpp example.cpp:4:6: error: #error "cannot find ...

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