github.com/vanus-labs/vanus/lib@v0.0.0-20231221070800-1334a7b9605e/sync/map.go (about) 1 // Copyright 2022 Linkall Inc. 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 sync 16 17 import ( 18 "sync" 19 ) 20 21 func MapLen(m *sync.Map) int { 22 if m == nil { 23 return 0 24 } 25 c := 0 26 m.Range(func(key, value interface{}) bool { 27 c++ 28 return true 29 }) 30 return c 31 }