1// compile
2
3// Copyright 2024 The Go Authors. All rights reserved.
4// Use of this source code is governed by a BSD-style
5// license that can be found in the LICENSE file.
6
7package p
8
9type Iterator[A any] func() (bool, A)
10
11type Range[A any] interface {
12	Blocks() Iterator[Block[A]]
13}
14
15type Block[A any] interface {
16	Range[A]
17}
18
19type rangeImpl[A any] struct{}
20
21func (r *rangeImpl[A]) Blocks() Iterator[Block[A]] {
22	return func() (bool, Block[A]) {
23		var a Block[A]
24		return false, a
25	}
26}
27
28func NewRange[A any]() Range[A] {
29	return &rangeImpl[A]{}
30}
31
32type AddrImpl struct{}
33
34var _ = NewRange[AddrImpl]()
35