Исходники и презентации

lessons/structs/unsafe_cast/performance_test.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"testing"
+	"unsafe"
+)
+
+// go test -bench=. -benchmem performance_test.go
+
+type Int int
+
+var convertedData []int
+
+func BenchmarkCast(b *testing.B) {
+	data := make([]Int, 1024)
+	for i := 0; i < b.N; i++ {
+		convertedData = make([]int, 1024)
+		for idx, value := range data {
+			convertedData[idx] = int(value)
+		}
+	}
+}
+
+func BenchmarkUnsafeCast(b *testing.B) {
+	data := make([]Int, 1024)
+	for i := 0; i < b.N; i++ {
+		convertedData = *(*[]int)(unsafe.Pointer(&data))
+	}
+}