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] }