On Monday, 3 October 2016 12:39:34 UTC+11, 刘桂祥 wrote:
> package main
>
>
> import (
> "fmt"
> )
> func main() {
> a := interface{}(100)
> println(&a, a)
> fmt.Sprint(a)
> }
>
>
> go run x.go the output:
>
>
> 0xc42003bf18 (0x89040,0xc42000a2c0)
>
>
>
> I just want to ask 0xc42000a2c0 as the a (interface{}) 's data pointer is
> point to where ? heap ?
It is on the heap, the value escapes when passed to fmt,Sprint
>
> also I test this:
>
>
> func BenchmarkFmtEscap3(b *testing.B) {
> b.ReportAllocs()
>
>
> for i := 0; i < b.N; i++ {
> a := interface{}(100)
> fmt.Sprint(a)
> }
> }
>
>
> BenchmarkFmtEscap3-4 10000000 141 ns/op
> 16 B/op 2 allocs/op
>
>
>
> why is 2 allocs and 16bytes ??
One for a, which escapes to the heap when passed to fmt.Sprint, and one for the
value returned from fmt,Sprint
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