Capturing
Closures are inherently flexible and will do what the functionality requires to make the closure work without annotation. This allows capturing to flexibly adapt to the use case, sometimes moving and sometimes borrowing. Closures can capture variables:
- by reference:
&T - by mutable reference:
&mut T - by value:
T
They preferentially capture variables by reference and only go lower when required.
Using move before vertical pipes forces closure
to take ownership of captured variables:
See also:
Box and std::mem::drop