go issue48042 源码
golang issue48042 代码
文件路径：/test/typeparam/issue48042.go
// run
// Copyright 2021 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"
"reflect"
)
type G[T any] interface {
g() func()(*T)
}
type Foo[T any] struct {
}
// OCALL
func (l *Foo[T]) f1() (*T) {
return g[T]()()
}
// OCALLFUNC
func (l *Foo[T]) f2() (*T) {
var f = g[T]
return f()()
}
// OCALLMETH
func (l *Foo[T]) f3() (*T) {
return l.g()()
}
// OCALLINTER
func (l *Foo[T]) f4() (*T) {
var g G[T] = l
return g.g()()
}
// ODYNAMICDOTTYPE
func (l *Foo[T]) f5() (*T) {
var x interface{}
x = g[T]
return x.(func()func()(*T))()()
}
func (l *Foo[T]) g() func() (*T) {
return func() (*T) {
t := new(T)
reflect.ValueOf(t).Elem().SetInt(100)
return t
}
}
func g[T any]() func() (*T) {
return func() (*T) {
t := new(T)
reflect.ValueOf(t).Elem().SetInt(100)
return t
}
}
func main() {
foo := Foo[int]{}
// Make sure the function conversion is correct
if n := *(foo.f1()) ; n != 100{
panic(fmt.Sprintf("%v",n))
}
if n := *(foo.f2()) ; n != 100{
panic(fmt.Sprintf("%v",n))
}
if n := *(foo.f3()) ; n != 100{
panic(fmt.Sprintf("%v",n))
}
if n := *(foo.f4()) ; n != 100{
panic(fmt.Sprintf("%v",n))
}
if n := *(foo.f5()) ; n != 100{
panic(fmt.Sprintf("%v",n))
}
}
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