add copy example

.gitignore

@@ -4,3 +4,4 @@ datatypes/datatypes
 appending/appending
 import/import
 compclass/compclass
+copy/copy

copy/Makefile

@@ -0,0 +1,12 @@
+
+TARGET := copy
+
+all: $(TARGET)
+
+$(TARGET): $(TARGET).d
+
+%: %.d
+	gdc -o $@ $<
+
+clean:
+	-rm -f *.o *~ $(TARGET)

copy/copy.d

@@ -0,0 +1,33 @@
+
+import std.stdio;
+
+struct S
+{
+    int a;
+    int b;
+};
+
+class C
+{
+    int a;
+    int b;
+};
+
+void main(string[] args)
+{
+    S s1;
+    s1.a = 3;
+    s1.b = 4;
+    S s2 = s1;
+    s2.a = 5;
+    s2.b = 6;
+    writefln("S: %d, %d; %d, %d", s1.a, s1.b, s2.a, s2.b);
+
+    C c1 = new C();
+    c1.a = 10;
+    c1.b = 11;
+    C c2 = c1;
+    c2.a = 12;
+    c2.b = 13;
+    writefln("C: %d, %d; %d, %d", c1.a, c1.b, c2.a, c2.b);
+}