Исходники и презентации

lessons/interfaces/interface_cast/main.go

@@ -0,0 +1,34 @@
+package main
+
+type BaseStorageImpl struct{}
+
+func (s BaseStorageImpl) Close() {}
+
+type SyncStorageImpl struct{}
+
+func (s SyncStorageImpl) Close() {}
+func (s SyncStorageImpl) Sync()  {}
+
+type BaseStorage interface {
+	Close()
+}
+
+type SyncStorage interface {
+	Close()
+	Sync()
+}
+
+func main() {
+	var baseStorage BaseStorage = BaseStorageImpl{}
+	var syncStorage SyncStorage = SyncStorageImpl{}
+
+	println("baseStorage:", baseStorage)
+	baseStorage = syncStorage
+	println("baseStorage:", baseStorage)
+
+	println("syncStorage:", syncStorage)
+	syncStorageCasted := syncStorage.(interface{ Close() })
+	println("syncStorageCasted:", syncStorageCasted)
+
+	//syncStorage = baseStorage
+}