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package main
import (
"strings"
"sync"
)
// Define an interface of stringBuilder that is compatible with
// strings.Builder(go 1.10) and bytes.Buffer(< go 1.10).
type stringBuilder interface {
WriteRune(r rune) (n int, err error)
WriteString(s string) (int, error)
Reset()
Grow(n int)
String() string
}
var builderPool = sync.Pool{New: func() interface{} {
return newStringBuilder()
}}
func newStringBuilder() stringBuilder {
return &strings.Builder{}
}
func main() {
i := builderPool.Get()
sb := i.(stringBuilder)
_, _ = sb.WriteString("hello")
println(sb.String())
builderPool.Put(i)
}
// Output:
// hello
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