c++ - 我如何知道函数是否已内联？

Question

如果我将任何函数标记为内联，有没有办法知道该函数是否内联？

Answer 1

使用 GCC，您可以使用 -Winline 编译器选项:

  -Winline  Warn if a function can not be inlined and it was declared as inline.

gcc 的 man 文件继续说:

  Even with this option, the compiler will not warn about  failures to inline functions declared in system headers.  The compiler uses a variety of heuristics to determine whether or  not to inline a function.  For example, the compiler takes into  account the size of the function being inlined and the amount of  inlining that has already been done in the current function.  Therefore, seemingly insignificant changes in the source program  can cause the warnings produced by -Winline to appear or disappear.