Sams Teach Yourself C++ in 21 Days

165: ASSERT(Invariants());

166: }

167: String& GetName()

168: {

169: ASSERT(Invariants());

170: return itsName;

171: }

172: void SetName(const String& name)

173: {

174: ASSERT(Invariants());

175: itsName = name;

176: ASSERT(Invariants());

177: }

178: BOOL Invariants();

179: private:

180: int itsAge;

181: String itsName;

182: };

183:

184: Animal::Animal(int age, const String& name):

185: itsAge(age),

186: itsName(name)

187: {

188: ASSERT(Invariants());

189: }

190:

191: BOOL Animal::Invariants()

192: {

193: #ifdef SHOW_INVARIANTS

194: cout << “Animal Tested OK”;

195: #endif

196: return (itsAge > 0 && itsName.GetLen());

197: }

198:

199: int main()

200: {

201: Animal sparky(5,”Sparky”);

202: cout << endl << sparky.GetName().GetString() << “ is “;

203: cout << sparky.GetAge() << “ years old.”;

204: sparky.SetAge(8);

205: cout << endl << sparky.GetName().GetString() << “ is “;

206: cout << sparky.GetAge() << “ years old.”;

207: return 0;

208: }

768 Day 21

LISTING21.4 continued