c# data matrix A QUICK TOUR OF THE C++/C LI LANGUA GE FEA TURES in C#

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CHAPTER 2 A QUICK TOUR OF THE C++/C LI LANGUA GE FEA TURES
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Using interfaces, the code in Listing 2-8 shows an implementation of RadioactiveAtom that implements the IRadioactive interface. Note the absence of the public keyword in the base class and interface list. Inheritance is always public in C++/CLI, so there is no need for the public keyword. Listing 2-8. Defining and Implementing an Interface // atom_interfaces.cpp interface class IRadioactive { void AlphaDecay(); void BetaDecay(); double GetHalfLife(); }; ref class RadioactiveAtom : Atom, IRadioactive { double half_life; void UpdateHalfLife() { // ... }
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public: // The atom releases an alpha particle // so it loses two protons and two neutrons. virtual void AlphaDecay() { SetAtomicNumber(GetAtomicNumber() - 2); SetIsotopeNumber(GetIsotopeNumber() - 4); UpdateHalfLife(); } // The atom releases an electron. // A neutron changes into a proton. virtual void BetaDecay() { SetAtomicNumber(GetAtomicNumber() + 1); UpdateHalfLife(); } virtual double GetHalfLife() { return half_life; } };
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CHAPTER 2 A QUICK TOUR OF THE C ++/C LI LA NGUA GE FEATURES
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The plan is to eventually set up a loop representing increasing time, and roll the dice at each step to see whether each atom decays. If it does, we want to call the appropriate decay method, either beta decay or alpha decay. These decay methods of the RadioactiveAtom class will update the atomic number and isotope number of the atom according to the new isotope that the atom decayed to. At this point, in reality, the atom could still be radioactive, and would then possibly decay further. We would have to update the half-life at this point. In the next sections, we will continue to develop this example. The previous sections demonstrated the declaration and use of managed aggregate types, including ref classes, value classes, managed arrays, enum classes, and interface classes. In the next section, you ll learn about features that model the has-a relationship for an object: properties, delegates, and events.
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Elements Modeling the has-a Relationship
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One thing you ve probably noticed by now in our Atom class is there are a lot of methods that begin with Get and Set to capture the has-a relationship between an object and the properties of the object. Some of the C++/CLI features were added simply to capture such commonly used patterns in the language. Doing this helps standardize common coding practices, which can help in making code more readable. Language features in C++/CLI supporting the has-a relationship include properties and events.
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C++/CLI provides language support for properties. Properties are elements of a class that are represented by a value (or set of indexed values for indexed properties). Many objects have properties, and making this a first-class language construct, even if at first they might seem a trivial addition, does make life easier. Let s change all the Get and Set methods and use properties instead. For simplicity, we ll return to the example without the interfaces (see Listing 2-9). Listing 2-9. Using Properties ref class Atom { private: array<double>^ pos; public: Atom(double x, double y, double z, unsigned int a, unsigned int n) { pos = gcnew array<double>(3); pos[0] = x; pos[1] = y; pos[2] = z; AtomicNumber = a; IsotopeNumber = n; }
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CHAPTER 2 A QUICK TOUR OF THE C++/C LI LANGUA GE FEA TURES
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property unsigned int AtomicNumber; property unsigned int IsotopeNumber; property Element ElementType { Element get() { return safe_cast<Element>(AtomicNumber); } void set(Element element) { AtomicNumber = safe_cast<int>(element); } } property double Position[int] { // If index is out of range, the array access will // throw an IndexOutOfRange exception. double get(int index) { return pos[index]; } void set(int index, double value) { pos[index] = value; } } }; We create four properties: AtomicNumber, IsotopeNumber, ElementType, and Position. We deliberately use three different ways of defining these properties to illustrate the range of what you can do with properties: The ElementType property is the standard, commonly used form. The property is named, followed by a block containing the get and set methods, fully prototyped and implemented. The names of the accessors must be get and set, although you don t have to implement both. If you implement only one of them, the property becomes read-only or write-only. The AtomicNumber and IsotopeNumber properties are trivial properties. Trivial properties have getter and setter methods created automatically for them: also notice that we remove the atomicNumber and isotopeNumber fields. They are no longer needed since private fields are created automatically for trivial properties.
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