go issue50690c 源码
golang issue50690c 代码
文件路径：/test/typeparam/issue50690c.go
// run
// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"fmt"
)
type Printer[T ~string] struct {
PrintFn func(T)
}
func Print[T ~string](s T) {
fmt.Println(s)
}
func PrintWithPrinter[T ~string, S interface {
~struct {
ID T
PrintFn_ func(T)
}
PrintFn() func(T)
}](message T, obj S) {
obj.PrintFn()(message)
}
func main() {
PrintWithPrinter(
"Hello, world.",
StructWithPrinter{ID: "fake", PrintFn_: Print[string]},
)
}
type StructWithPrinter struct {
ID string
PrintFn_ func(string)
}
// Field accesses through type parameters are disabled
// until we have a more thorough understanding of the
// implications on the spec. See issue #51576.
// Use accessor method instead.
func (s StructWithPrinter) PrintFn() func(string) {
return s.PrintFn_
}
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