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59 lines
1.2 KiB
Go
59 lines
1.2 KiB
Go
2 years ago
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// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package set provides simple set data structures for uint64s.
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package set
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import "math/bits"
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// int64s represents a set of integers within the range of 0..63.
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type int64s uint64
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func (bs *int64s) Len() int {
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return bits.OnesCount64(uint64(*bs))
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}
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func (bs *int64s) Has(n uint64) bool {
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return uint64(*bs)&(uint64(1)<<n) > 0
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}
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func (bs *int64s) Set(n uint64) {
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*(*uint64)(bs) |= uint64(1) << n
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}
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func (bs *int64s) Clear(n uint64) {
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*(*uint64)(bs) &^= uint64(1) << n
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}
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// Ints represents a set of integers within the range of 0..math.MaxUint64.
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type Ints struct {
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lo int64s
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hi map[uint64]struct{}
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}
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func (bs *Ints) Len() int {
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return bs.lo.Len() + len(bs.hi)
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}
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func (bs *Ints) Has(n uint64) bool {
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if n < 64 {
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return bs.lo.Has(n)
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}
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_, ok := bs.hi[n]
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return ok
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}
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func (bs *Ints) Set(n uint64) {
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if n < 64 {
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bs.lo.Set(n)
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return
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}
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if bs.hi == nil {
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bs.hi = make(map[uint64]struct{})
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}
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bs.hi[n] = struct{}{}
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}
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func (bs *Ints) Clear(n uint64) {
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if n < 64 {
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bs.lo.Clear(n)
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return
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}
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delete(bs.hi, n)
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}
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