连续内存，溢出
1 #include <iostream>
2 using namespace std;
3
4 template <typename T>
5 class DoulStack
6 {
7 private:
8 T* data_;
9 int top1_;
10 int top2_;
11 unsigned size_;
12 public:
13 DoulStack(unsigned size = 1000) : data_(new T[size]), top1_(0), top2_(size - 1), size_(size)
14 {
15 if (data_ == 0)
16 {
17 exit(1);
18 }
19 }
20 DoulStack(const DoulStack& ds) : data_(new T[ds.size_]), top1_(ds.top1_), top2_(ds.top2_), size_(ds.size_)
21 {
22 if (data_ == 0)
23 {
24 exit(1);
25 }
26 memcpy(data_, ds.data_, sizeof (T) * ds.size_);
27 }
28 DoulStack& operator = (const DoulStack& ds)
29 {
30 if (this != &ds)
31 {
32 delete [] data_;
33 data_ = new T[ds.size_];
34 if (data_ == 0)
35 {
36 exit(1);
37 }
38 top1_ = ds.top1_;
39 top2_ = ds.top2_;
40 size_ = ds.size_;
41 memcpy(data_, ds.data_, sizeof (T) * ds.size_);
42 }
43 return *this;
44 }
45 ~DoulStack()
46 {
47 delete [] data_;
48 }
49 bool empty()
50 {
51 return empty1() && empty2();
52 }
53 bool full()
54 {
55 return top1_ - 1 == top2_;
56 }
57 bool resize(unsigned size)
58 {
59 T* temp = new T[size];
60 if (temp == 0)
61 {
62 exit(1);
63 }
64 for (int i = 0; i != top1_; ++i)
65 {
66 temp[i] = data_[i];
67 }
68 for (int i = size - 1, j = size_ - 1; j != top2_; --i, --j)
69 {
70 temp[i] = data_[j];
71 }
72 size_ = size;
73 delete [] data_;
74 data_ = temp;
75 }
76 void push1(const T& t)
77 {
78 if (full())
79 {
80 resize(size_ * 2);
81 }
82 data_[top1_++] = t;
83 }
84 void push2(const T& t)
85 {
86 if (full())
87 {
88 resize(size_ * 2);
89 }
90 data_[top2_--] = t;
91 }
92 void pop1()
93 {
94 --top1_;
95 }
96 void pop2()
97 {
98 ++top2_;
99 }
100 T top1()
101 {
102 return data_[top1_ - 1];
103 }
104 T top2()
105 {
106 return data_[top2_ + 1];
107 }
108 bool empty1()
109 {
110 return top1_ == 0;
111 }
112 bool empty2()
113 {
114 return top2_ == size_ - 1;
115 }
116 };
117
118 int main()
119 {
120 DoulStack<int> ds;
121 for (int i = 0; i < 10; ++i)
122 {
123 ds.push1(i);
124 ds.push2(9 - i);
125 }
126 while (!ds.empty1())
127 {
128 cout << ds.top1() << endl;
129 ds.pop1();
130 }
131 while (!ds.empty2())
132 {
133 cout << ds.top2() << endl;
134 ds.pop2();
135 }
136 cout << ds.empty() << endl;
137 }
posted on 2011-06-17 15:30
unixfy 阅读(143)
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