interface-method-cost.go

package main

import "testing"

type Foo struct {
}

func (f *Foo) Hi() {
}

type IFoo interface {
    Hi()
}

// BenchmarkInterface   1000000000               2.12 ns/op
func BenchmarkInterface(b *testing.B) {
    var f IFoo = &Foo{}
    for i := 0; i < b.N; i++ {
        f.Hi()
    }
}

// BenchmarkStruct      2000000000               0.31 ns/op
func BenchmarkStruct(b *testing.B) {
    f := &Foo{}
    for i := 0; i < b.N; i++ {
        f.Hi()
    }
}