Destructor in C?

Question

Destructor in C?

C ++ has a nice function that allows you to call some code at the end of a block - a destructor. Yesterday, I accidentally discovered a trick that works in C similar to a destructor in C ++. For illustration, this trick is used to automatically close a file:

#include <stdio.h>

#define AUTO_FILE( id, name, access ) \
for ( FILE* id = fopen( name, access ); id != NULL; fclose( id ), id = NULL )

int main()
{
    AUTO_FILE( f, "hello.txt", "w" ) {
        fprintf( f, "Hello World!" );
    }
    return 0;
}

I think this is good and can have interesting customs. For example, if you combine it with a stack data structure, you can declare very intuitive and readable tree structures directly in the source code:

frame("frm") {
    menu("mnu") {
        popupmenu("file", "File") {
            menuitem("exit", "Exit");
        }
        popupmenu("help", "Help") {
            menuitem("about", "About...");
        }
    }
    label("lbl", "Hello World!");
    button("btn", "Push me!", btn_onclick);
}