Function Object for Method with a Single Parameter.

Supporting Design by Contract in C++
by David Maley and Ivor Spence
Listing 2. Function Object for Method with a Single Parameter.


template <typename Object, typename ReturnType, typename Formal1>
class DBC1 {
  typedef ReturnType (Object::* BodyType)(const Formal1&);
  bool pre(const Formal1&) const { return true; }
  void preFailure() const { throw Assertion("preFailure", __FILE__, __LINE__); }
  bool post(const ReturnType&, const Formal1&) const { return true; }
  void postFailure() const { throw Assertion("preFailure",__FILE__,__LINE__); }
  BodyType _body;
  const Object *_object, *_old;
  Object *_mutableObject;
public:
  DBC1(Object* object, BodyType body) : _body(body),_mutableObject(object),_object(object),_old(object) { }
  ReturnType operator()(const Formal1&);
};

About the Authors

David Maley is with St. Mary's University College, Belfast. He can be contacted at d.maley@stmarys-belfast.ac.uk.

Ivor Spence is with Queen's University of Belfast. He can be contacted at i.spence@qub.ac.uk.

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