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https://github.com/Oxalide/vsphere-influxdb-go.git
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39 lines
1009 B
Go
39 lines
1009 B
Go
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/*
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Copyright (c) 2015-2016 VMware, Inc. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package flags
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import "sync"
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// Key type for storing flag instances in a context.Context.
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type flagKey string
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// Type to help flags out with only registering/processing once.
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type common struct {
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register sync.Once
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process sync.Once
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}
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func (c *common) RegisterOnce(fn func()) {
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c.register.Do(fn)
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}
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func (c *common) ProcessOnce(fn func() error) (err error) {
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c.process.Do(func() {
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err = fn()
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})
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return err
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}
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