23:
24: // define the exception classes
25: class xBoundary {};
26: class xSize
27: {
28: public:
29: xSize(int size):itsSize(size) {}
30: ~xSize(){}
31: int GetSize() { return itsSize; }
32: private:
33: int itsSize;
34: };
35:
36: class xTooBig : public xSize
37: {
38: public:
39: xTooBig(int size):xSize(size){}
40: };
41:
42: class xTooSmall : public xSize
43: {
44: public:
45: xTooSmall(int size):xSize(size){}
46: };
47:
48: class xZero : public xTooSmall
49: {
50: public:
51: xZero(int size):xTooSmall(size){}
52: };
53:
54: class xNegative : public xSize
55: {
56: public:
57: xNegative(int size):xSize(size){}
58: };
59:
60: private:
61: int *pType;
62: int itsSize;
63: };
64:
65:
66: Array::Array(int size):
67: itsSize(size)
68: {
69: if (size == 0)
70: throw xZero(size);736 Day 20
LISTING20.7 continued