New example

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@779 626c5289-ae23-0410-ae9c-e8d60b6d4f22

SWIG/Examples/perl5/class/example.pl

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+# file: example.pl
+
+# This file illustrates the low-level C++ interface
+# created by SWIG.  In this case, all of our C++ classes
+# get converted into function calls.
+
+use example;
+
+# ----- Object creation -----
+
+print "Creating some objects:\n";
+$c = example::new_Circle(10);
+print "    Created circle $c\n";
+$s = example::new_Square(10);
+print "    Created square $s\n";
+
+# ----- Access a static member -----
+
+print "\nA total of $example::Shape_nshapes shapes were created\n";
+
+# ----- Member data access -----
+
+# Set the location of the object
+
+# Notice how we can do this using functions specific to
+# the 'Circle' class.
+example::Circle_x_set($c, 20);
+example::Circle_y_set($c, 30);
+
+# Now use the same functions in the base class
+example::Shape_x_set($s,-10);
+example::Shape_y_set($s,5);
+
+print "\nHere is their current position:\n";
+print "    Circle = (",example::Shape_x_get($c),",", example::Shape_y_get($c),")\n";
+print "    Square = (",example::Shape_x_get($s),",", example::Shape_y_get($s),")\n";
+
+# ----- Call some methods -----
+
+print "\nHere are some properties of the shapes:\n";
+foreach $o ($c,$s) {
+      print "    $o\n";
+      print "        area      = ", example::Shape_area($o), "\n";
+      print "        perimeter = ", example::Shape_perimeter($o), "\n";
+  }
+# Notice how the Shape_area() and Shape_perimeter() functions really
+# invoke the appropriate virtual method on each object.
+
+# ----- Delete everything -----
+
+print "\nGuess I'll clean up now\n";
+
+# Note: this invokes the virtual destructor
+example::delete_Shape($c);
+example::delete_Shape($s);
+
+print $example::Shape_nshapes," shapes remain\n";
+print "Goodbye\n";
+