Allocation example

iface_test.go

package iface_test

import "testing"

func setOneLine(p *int, v interface{}) {
	*p = v.(int)
}

func setTwoLines(p *int, v interface{}) {
	intv := v.(int)
	*p = intv
}

func BenchmarkOneLine(b *testing.B) {
	var v int

	for i := 0; i < b.N; i++ {
		setOneLine(&v, i)
	}
}

func BenchmarkTwoLines(b *testing.B) {
	var v int

	for i := 0; i < b.N; i++ {
		setTwoLines(&v, i)
	}
}

results.txt

testing: warning: no tests to run
PASS
BenchmarkOneLine-8 	30000000	        45.2 ns/op	       8 B/op	       1 allocs/op
BenchmarkTwoLines-8	100000000	        17.2 ns/op	       0 B/op	       0 allocs/op