Исходники и презентации

lessons/interfaces/interface_performance/performance_test.go

@@ -0,0 +1,58 @@
+package main
+
+import "testing"
+
+// go test -bench=. -benchmem performance_test.go
+
+type ValueInterface interface {
+	Add() int
+}
+
+type Value struct {
+	number int
+}
+
+//go:noinline
+func (v Value) Add() int {
+	return v.number + v.number
+}
+
+type Value2 struct {
+	number int
+}
+
+//go:noinline
+func (v Value2) Add() int {
+	return v.number + v.number
+}
+
+var Result int
+
+func Get(index int) ValueInterface {
+	if index == 0 {
+		return Value{}
+	} else {
+		return Value2{}
+	}
+}
+
+func BenchmarkDirect(b *testing.B) {
+	var value Value
+	for i := 0; i < b.N; i++ {
+		Result = value.Add()
+	}
+}
+
+func BenchmarkWithInterface1(b *testing.B) {
+	var iface ValueInterface = Get(0)
+	for i := 0; i < b.N; i++ {
+		Result = iface.Add()
+	}
+}
+
+func BenchmarkWithInterface2(b *testing.B) {
+	var iface ValueInterface = Get(1)
+	for i := 0; i < b.N; i++ {
+		Result = iface.(Value2).Add()
+	}
+}