Initial data commit

Task/Inheritance-Multiple/Go/inheritance-multiple-2.go

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+// Example of composition of interfaces.
+// Types implement interfaces simply by implementing functions.
+// The type does not explicitly declare the interfaces it implements.
+package main
+
+import "fmt"
+
+// Two interfaces.
+type camera interface {
+    photo()
+}
+
+type mobilePhone interface {
+    call()
+}
+
+// Compose interfaces.  cameraPhone interface now contains whatever
+// methods are in camera and mobilePhone.
+type cameraPhone interface {
+    camera
+    mobilePhone
+}
+
+// User defined type.
+type htc int
+
+// Once the htc type has this method defined on it, it automatically satisfies
+// the camera interface.
+func (htc) photo() {
+    fmt.Println("snap")
+}
+
+// And then with this additional method defined, it now satisfies both the
+// mobilePhone and cameraPhone interfaces.
+func (htc) call() {
+    fmt.Println("omg!")
+}
+
+func main() {
+    // type of i is the composed interface.  The assignment only compiles
+    // because static type htc satisfies the interface cameraPhone.
+    var i cameraPhone = new(htc)
+    // interface functions can be called without reference to the
+    // underlying type.
+    i.photo()
+    i.call()
+}