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## std/iterators: The Iter interface and associated functions.
## This module is imported by default.
## The Iter interface. Any type implementing `next()` is iterable.
pub type Iter[T] = interface
next(mut Self): Option[T]
# todo: useful functions for an iterator
# https://doc.rust-lang.org/std/iter/trait.Iterator.html#provided-methods
pub func advance_by[T](self: Iter[T], n: uint): Result[T, ...] =
for i in 0 .. n:
if self.next().is_none():
return Error(...)
Okay
pub func get[T](self: Iter[T], at: uint): Option[T]
self.advance_by(at-1).ok?
self.next()
# todo: implement iter[T](self: ...): Iter[T] funcs
# todo: efficient functional methods
## The Peek interface. Any type implementing Iter, `peek`, and `peek_nth` is peekable.
pub type Peek[T] = interface
next(mut Self): Option[T]
peek(mut Self): Option[T]
peek_nth(mut Self, n: uint): Option[T]
# todo: implement peek[T](self: Iter[T]): Peek[T]
# todo: implement Peekable struct
# https://github.com/LukeMathWalker/multipeek/blob/main/src/lib.rs
## We don't want a Countable. It's not terribly useful.
# pub type Countable[T] = interface
# next(mut Self): Option[T]
# len(Self): uint
# get(Self, uint): Option[T]
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