c/lua:userdata

c/lua/_demo/userdata/userdata.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"unsafe"
+
+	"github.com/goplus/llgo/c"
+	"github.com/goplus/llgo/c/lua"
+)
+
+type lightdata struct {
+	value int
+}
+
+func main() {
+	L := lua.Newstate()
+	defer L.Close()
+	L.Openlibs()
+
+	data := L.Newuserdata(unsafe.Sizeof(0))
+	*((*int)(data)) = 42
+	L.Setglobal(c.Str("data"))
+
+	light := &lightdata{value: 24}
+	L.Pushlightuserdata(unsafe.Pointer(light))
+	L.Setglobal(c.Str("lightdata"))
+
+	L.Getglobal(c.Str("data"))
+	if L.Isuserdata(-1) != 0 {
+		data := L.Touserdata(-1)
+		c.Printf(c.Str("userdata %d\n"), *(*int)(data))
+	}
+
+	L.Getglobal(c.Str("lightdata"))
+	if L.Islightuserdata(-1) {
+		light := (*lightdata)(L.Touserdata(-1))
+		c.Printf(c.Str("lightdata %d\n"), light.value)
+	}
+}
+
+/* Expected output:
+userdata 42
+lightdata 24
+*/