Исходники и презентации

lessons/slices_and_arrays/clip/main.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"fmt"
+	"runtime"
+	"slices"
+	"unsafe"
+)
+
+func printAllocs() {
+	var m runtime.MemStats
+	runtime.ReadMemStats(&m)
+	fmt.Printf("%d MB\n", m.Alloc/1024/1024)
+}
+
+func main() {
+	data := make([]int, 10, 100<<20)
+	fmt.Println("data:", unsafe.SliceData(data), len(data), cap(data))
+
+	printAllocs()
+
+	temp1 := data[:10]
+	fmt.Println("temp1:", unsafe.SliceData(temp1), len(temp1), cap(temp1))
+
+	temp2 := slices.Clip(data) // data[:10:10]
+	fmt.Println("temp2:", unsafe.SliceData(temp2), len(temp2), cap(temp2))
+
+	runtime.GC()
+	printAllocs()
+
+	runtime.KeepAlive(temp1)
+	runtime.KeepAlive(temp2)
+}