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// 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{ type 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))
}
}
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