55 lines
1.2 KiB
Go
55 lines
1.2 KiB
Go
/*
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* Copyright (c) 2024 The GoPlus Authors (goplus.org). 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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*
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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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*/
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package async
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import (
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_ "unsafe"
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)
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type Void = [0]byte
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type Future[T any] func() T
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type IO[T any] func(e *AsyncContext) Future[T]
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type AsyncContext struct {
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*Executor
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complete func()
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}
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func (ctx *AsyncContext) Complete() {
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ctx.complete()
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}
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func Async[T any](fn func(resolve func(T))) IO[T] {
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return func(ctx *AsyncContext) Future[T] {
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var result T
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var done bool
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fn(func(t T) {
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result = t
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done = true
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ctx.Complete()
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})
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return func() T {
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if !done {
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panic("async.Async: Future accessed before completion")
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}
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return result
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}
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}
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}
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