metaprogramming

问题 I would like to wrap all the user defined functions in a scala project that return a certain type T , into a function that accepts a T and the function name as parameters. eg. given this function is in scope: def withMetrics[T](functionName: String)(f: => Try[T]): Try[T] = { f match { case _: Success[T] => println(s"send metric: success for $functionName") case _: Failure[T] => println(s"send metric: failure for $functionName") } f } the user can send metrics for their functions which return

问题 I don't get it, it seems to me that the call to f is completely unambiguous, but it fails to compile with expected primary-expression before ‘int’ . If I comment out the line with the call to f , it compiles fine. template<typename T> struct A { template<typename S> void f() { } }; template<typename T> struct B : A<T> { void g() { this->f<int>(); } }; 回答1: This is due to a really obscure provision of the standard in which if you have a template that tries to access a template function in an

来源： https://stackoverflow.com/questions/59206331/substitute-lhs-in-operator-with-rlang-tidyeval-inside-sys-setenv

来源： https://stackoverflow.com/questions/47364300/how-to-use-meta-programming-to-generate-code

来源： https://stackoverflow.com/questions/47364300/how-to-use-meta-programming-to-generate-code

来源： https://stackoverflow.com/questions/57309103/missing-default-argument-on-trailing-parameter-pack-on-clang

来源： https://stackoverflow.com/questions/63836449/how-do-i-get-the-signature-of-a-subroutine-in-runtime

来源： https://stackoverflow.com/questions/63836449/how-do-i-get-the-signature-of-a-subroutine-in-runtime

来源： https://stackoverflow.com/questions/54452809/how-to-support-dynamic-type-hinting-with-metaprogramming-in-pycharm

来源： https://stackoverflow.com/questions/63662004/equivalent-of-try-catch-as-an-expression