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640a49b8d4
Make sure that an embedded field like "MyStruct[T]" works and can be referenced via the name MyStruct. Change-Id: I8be1f1184dd42c4e54e4144aff2fd85e30af722f Reviewed-on: https://go-review.googlesource.com/c/go/+/356312 Trust: Dan Scales <danscales@google.com> Reviewed-by: Robert Griesemer <gri@golang.org>
47 lines
815 B
Go
47 lines
815 B
Go
// run -gcflags=-G=3
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// Copyright 2021 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test for declaration and use of a parameterized embedded field.
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package main
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import (
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"fmt"
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"sync"
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)
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type MyStruct[T any] struct {
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val T
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}
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type Lockable[T any] struct {
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MyStruct[T]
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mu sync.Mutex
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}
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// Get returns the value stored in a Lockable.
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func (l *Lockable[T]) Get() T {
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l.mu.Lock()
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defer l.mu.Unlock()
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return l.MyStruct.val
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}
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// Set sets the value in a Lockable.
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func (l *Lockable[T]) Set(v T) {
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l.mu.Lock()
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defer l.mu.Unlock()
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l.MyStruct = MyStruct[T]{v}
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}
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func main() {
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var li Lockable[int]
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li.Set(5)
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if got, want := li.Get(), 5; got != want {
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panic(fmt.Sprintf("got %d, want %d", got, want))
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}
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}
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