Trait core::iter::StepUnstable
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pub trait Step: Ord {
fn step(&mut self);
fn step_back(&mut self);
fn steps_between(start: &Self, end: &Self) -> Option<usize>;
}The Step trait identifies objects which can be stepped over in both
directions. The steps_between function provides a way to
compare two Step objects (it could be provided using step() and Ord,
but the implementation would be so inefficient as to be useless).
Required Methods
fn step(&mut self)
Change self to the next object.
fn step_back(&mut self)
Change self to the previous object.
fn steps_between(start: &Self, end: &Self) -> Option<usize>
The steps_between two step objects. start should always be less than end, so the result should never be negative. Return None if it is not possible to calculate steps_between without overflow.