Add support for finally macro / function

[tapika]

https://docs.microsoft.com/en-us/cpp/cpp/try-finally-statement?view=vs-2019

Microsoft compiler provides special syntax for using try - finally, but it's Microsoft specific. Is it possible to do same support for other compilers as well,

ideas on how to do it could be borrowed from here: https://stackoverflow.com/questions/161177/does-c-support-finally-blocks-and-whats-this-raii-i-keep-hearing-about

or self made implementation.

Wondering when this comes into C++ standards....

[nemequ]

While this might work in C++ (I'd have to do a bit more research), it definitely wouldn't work in C. You could do something similar with GCC's cleanup variable attribute, but the syntax would be pretty different and we definitely couldn't hide it in a macro.

Since this significantly alters the behavior of the code {see the Can you add support for «feature»? question in the FAQ) it's not a good fit for Hedley. Perhaps it would be better suited to Boost?

[Quuxplusone]

FWIW, you could use the technique shown in https://www.club.cc.cmu.edu/~ajo/disseminate/auto.h . This macro allows writing constructions like this:

#include <stdio.h>
#include "auto.h"
int main() {
    bool committed = false;
    Auto(puts("goodbye"));
    Auto(if (!committed) { puts("rollback"); });
    puts("hello world");
    committed = true;
}  // at this point "goodbye" is printed