blob: de1ea65ed227faa5da63301aad4c5a4573f43dcb (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
// run -gcflags=-G=3
// 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))
}
|
