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https://github.com/gohugoio/hugo.git
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58 lines
1.5 KiB
Go
58 lines
1.5 KiB
Go
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// Copyright 2024 The Hugo Authors. All rights reserved.
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//
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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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//
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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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package identity
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import "sync"
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// NewQuestion creates a new question with the given identity.
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func NewQuestion[T any](id Identity) *Question[T] {
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return &Question[T]{
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Identity: id,
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}
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}
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// Answer takes a func that knows the answer.
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// Note that this is a one-time operation,
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// fn will not be invoked again it the question is already answered.
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// Use Result to check if the question is answered.
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func (q *Question[T]) Answer(fn func() T) {
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q.mu.Lock()
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defer q.mu.Unlock()
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if q.answered {
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return
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}
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q.fasit = fn()
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q.answered = true
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}
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// Result returns the fasit of the question (if answered),
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// and a bool indicating if the question has been answered.
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func (q *Question[T]) Result() (any, bool) {
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q.mu.RLock()
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defer q.mu.RUnlock()
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return q.fasit, q.answered
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}
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// A Question is defined by its Identity and can be answered once.
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type Question[T any] struct {
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Identity
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fasit T
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mu sync.RWMutex
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answered bool
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}
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