golang issue50690b 代码
文件路径：/test/typeparam/issue50690b.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)
}
type PrintShop[T ~string] struct {
ID T
PrintFn_ func(T)
}
/ 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 PrintShop[T]) PrintFn() func(T) { return s.PrintFn_ }
func main() {
PrintWithPrinter(
"Hello, world.",
PrintShop[string]{
ID: "fake",
PrintFn_: Print[string],
},
)
}