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
import (
"fmt"
)
func Sum[T interface{ int | float64 }](vec []T) T {
var sum T
for _, elt := range vec {
sum = sum + elt
}
return sum
}
func Abs(f float64) float64 {
if f < 0.0 {
return -f
}
return f
}
func main() {
vec1 := []int{3, 4}
vec2 := []float64{5.8, 9.6}
got := Sum[int](vec1)
want := vec1[0] + vec1[1]
if got != want {
panic(fmt.Sprintf("got %d, want %d", got, want))
}
got = Sum(vec1)
if want != got {
panic(fmt.Sprintf("got %d, want %d", got, want))
}
fwant := vec2[0] + vec2[1]
fgot := Sum[float64](vec2)
if Abs(fgot-fwant) > 1e-10 {
panic(fmt.Sprintf("got %f, want %f", fgot, fwant))
}
fgot = Sum(vec2)
if Abs(fgot-fwant) > 1e-10 {
panic(fmt.Sprintf("got %f, want %f", fgot, fwant))
}
}
|
