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William Kurkianea869482019-04-09 15:16:11 -04001// Copyright 2015 The etcd Authors
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7// http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15package types
16
17import "strconv"
18
19// ID represents a generic identifier which is canonically
20// stored as a uint64 but is typically represented as a
21// base-16 string for input/output
22type ID uint64
23
24func (i ID) String() string {
25 return strconv.FormatUint(uint64(i), 16)
26}
27
28// IDFromString attempts to create an ID from a base-16 string.
29func IDFromString(s string) (ID, error) {
30 i, err := strconv.ParseUint(s, 16, 64)
31 return ID(i), err
32}
33
34// IDSlice implements the sort interface
35type IDSlice []ID
36
37func (p IDSlice) Len() int { return len(p) }
38func (p IDSlice) Less(i, j int) bool { return uint64(p[i]) < uint64(p[j]) }
39func (p IDSlice) Swap(i, j int) { p[i], p[j] = p[j], p[i] }