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// 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))
}