go sum 源码
golang sum 代码
文件路径：/test/typeparam/sum.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
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))
}
}
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