mirror of
https://github.com/golang/go
synced 2024-07-03 00:40:45 +00:00
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>
51 lines
855 B
Go
51 lines
855 B
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
|
|
|
|
type I interface {
|
|
foo() int
|
|
}
|
|
|
|
// There should be one instantiation of f for both squarer and doubler.
|
|
// Similarly, there should be one instantiation of f for both *incrementer and *decrementer.
|
|
func f[T I](x T) int {
|
|
return x.foo()
|
|
}
|
|
|
|
type squarer int
|
|
|
|
func (x squarer) foo() int {
|
|
return int(x*x)
|
|
}
|
|
|
|
type doubler int
|
|
|
|
func (x doubler) foo() int {
|
|
return int(2*x)
|
|
}
|
|
|
|
type incrementer int16
|
|
|
|
func (x *incrementer) foo() int {
|
|
return int(*x+1)
|
|
}
|
|
|
|
type decrementer int32
|
|
|
|
func (x *decrementer) foo() int{
|
|
return int(*x-1)
|
|
}
|
|
|
|
func main() {
|
|
println(f(squarer(5)))
|
|
println(f(doubler(5)))
|
|
var i incrementer = 5
|
|
println(f(&i))
|
|
var d decrementer = 5
|
|
println(f(&d))
|
|
}
|