New example for Ruby that shows how to implement a mark function. Also makes use of the tracking objects funcitonality.

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@7519 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/ruby/mark_function/example.cxx

@@ -0,0 +1,61 @@
+#include "example.h"
+
+Animal::Animal(const char* name) : name_(name)
+{
+}
+
+Animal::~Animal()
+{
+	name_ = "Destroyed";
+}
+
+/* Return the animal's name */
+const char* Animal::get_name() const
+{
+	return name_.c_str();
+}
+	
+Zoo::Zoo()
+{
+}
+
+Zoo::~Zoo()
+{
+	return;
+}
+
+/* Create a new animal. */
+Animal* Zoo::create_animal(const char* name)
+{
+	return new Animal(name);
+}
+
+/* Add a new animal to the zoo. */
+void Zoo::add_animal(Animal* animal)
+{
+	animals.push_back(animal);
+}
+
+Animal* Zoo::remove_animal(size_t i)
+{
+	/* Note a production implementation should check
+	   for out of range errors. */
+	Animal* result = this->animals[i];
+	IterType iter = this->animals.begin();
+	std::advance(iter, i);
+	this->animals.erase(iter);
+
+	return result;
+}
+
+/* Return the number of animals in the zoo. */
+size_t Zoo::get_num_animals() const
+{
+	return animals.size();
+}
+
+/* Return a pointer to the ith animal */
+Animal* Zoo::get_animal(size_t i) const
+{
+	return animals[i];
+}