mirror of
https://github.com/golang/go
synced 2024-11-23 09:50:03 -07:00
e24977d231
The next CL will remove the -G flag, effectively hard-coding it to its current default (-G=3). Change-Id: Ib4743b529206928f9f1cca9fdb19989728327831 Reviewed-on: https://go-review.googlesource.com/c/go/+/388534 Reviewed-by: Keith Randall <khr@golang.org> Trust: Matthew Dempsky <mdempsky@google.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
77 lines
1.3 KiB
Go
77 lines
1.3 KiB
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))
|
|
}
|
|
} |