add original source

source/listing_a.2.cpp

@@ -0,0 +1,18 @@
+class move_only
+{
+    std::unique_ptr<my_class> data;
+public:
+    move_only(const move_only&) = delete;
+    move_only(move_only&& other):
+        data(std::move(other.data))
+    {}
+    move_only& operator=(const move_only&) = delete;
+    move_only& operator=(move_only&& other)
+    {
+        data=std::move(other.data);
+        return *this;
+    }
+};
+move_only m1;
+move_only m2(m1);
+move_only m3(std::move(m1));