testing Go small structs and interfaces

small_test.go

package runtime

import "testing"

type intfc interface {
	f() intfc
}

type byval struct {
	x int
	y int
}

func (s byval) f() intfc { // by value
	s.x++
	return s
}

func BenchmarkSmallByValue(b *testing.B) {
	var v intfc = byval{1, 1}
	for n := 0; n < b.N; n++ {
		v = v.f()
	}
}

type byptr struct {
	x int
	y int
}

func (s *byptr) f() intfc { // by pointer
	s.x++
	return s
}

func BenchmarkSmallByPointer(b *testing.B) {
	var v intfc = &byptr{1, 1}
	for n := 0; n < b.N; n++ {
		v = v.f()
	}
}