On Tuesday, 23 January 2018 at 00:00:38 UTC, aliak wrote:
Hi, I'm trying to get a list of only member functions of a struct. I've found that if you do not declare a struct as static inside a scope, then there's a hidden "this" member as part of the struct. Can someone explain the logic there?
The struct defined inside a scope can mention variables defined in that scope (e.g. use them in its methods), so it needs a pointer to the place where those closed variables live. That's the main difference between such struct and a static one that cannot use those scope vars. I guess you're seeing that pointer as additional member.
As for static foreach, when you write a simple foreach over some compile-time tuple (like in this case), it's unrolled at compile time similarly to "static foreach", the main difference is whether it creates a sub-scope for the loop body or not. "foreach" creates one, "static foreach" doesn't.