On Monday, 24 December 2018 at 11:18:44 UTC, Ron Tarrant wrote:
I found a mention that in the definition of a delegate, a
function parameter and its type could be replaced by an
underscore:
myTestRig.addOnDestroy(delegate void(Widget w) { quitApp(); } );
became:
myTestRig.addOnDestroy(delegate void(_) { quitApp(); } );
I was trying to find some further documentation on this, but
I'm coming up empty.
Questions:
1) What is this called (substituting an underscore in this
manner)?
2) Where can a learn more about it?
The underscore is just an identifier but nothing special, it
could be any valid identifier like "ldkhfksdkdsg".
```
void ggg();
void takedelegate(void delegate(int) dlg);
void foo() {
takedelegate( delegate void(asdadasdeg) { ggg(); } );
}
```
The type of the argument is deduced from the function the
delegate is passed to.
-Johan
