go.etcd.io/etcd@v3.3.27+incompatible/pkg/types/id.go (about) 1 // 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 15 package types 16 17 import ( 18 "strconv" 19 ) 20 21 // ID represents a generic identifier which is canonically 22 // stored as a uint64 but is typically represented as a 23 // base-16 string for input/output 24 type ID uint64 25 26 func (i ID) String() string { 27 return strconv.FormatUint(uint64(i), 16) 28 } 29 30 // IDFromString attempts to create an ID from a base-16 string. 31 func IDFromString(s string) (ID, error) { 32 i, err := strconv.ParseUint(s, 16, 64) 33 return ID(i), err 34 } 35 36 // IDSlice implements the sort interface 37 type IDSlice []ID 38 39 func (p IDSlice) Len() int { return len(p) } 40 func (p IDSlice) Less(i, j int) bool { return uint64(p[i]) < uint64(p[j]) } 41 func (p IDSlice) Swap(i, j int) { p[i], p[j] = p[j], p[i] }