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comparison SMART/Java/Python/Cpp/table.hpp @ 18:94ab73e8a190

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author m-zytnicki
date Mon, 29 Apr 2013 03:20:15 -0400
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17:b0e8584489e6 18:94ab73e8a190
1 #ifndef TABLE_HPP
2 #define TABLE_HPP
3
4 #include <iostream>
5 #include <fstream>
6 #include <string>
7 #include <stdio.h>
8 using namespace std;
9
10 typedef unsigned int Value;
11 static const unsigned int SENTINEL = -1;
12
13 class Table {
14 private:
15 int sentinel;
16 Value *values;
17
18 public:
19 string fileName;
20 unsigned int width;
21 unsigned int height;
22 fstream file;
23
24 Table (string fileName, unsigned int width, unsigned int height): sentinel(-1), fileName(fileName), width(width), height(height) {
25 file.open(fileName.c_str(), ios::out | ios::in | ios::binary);
26 Value v = 0;
27 for (unsigned int i = 0; i < width * height; i++) {
28 writeHere(v);
29 }
30 file.flush();
31 values = new Value[width];
32 }
33
34 ~Table () {
35 delete[] values;
36 }
37
38 void moveTo (unsigned int col, unsigned int line) {
39 if (col == SENTINEL) {
40 sentinel = line;
41 }
42 else {
43 sentinel = -1;
44 file.seekp((col * width + line) * sizeof(Value));
45 }
46 }
47
48 void write (Value v, unsigned int col, unsigned int line) {
49 moveTo(col, line);
50 writeHere(v);
51 }
52
53 void writeHere(Value v) {
54 if (sentinel >= 0)
55 values[sentinel] = v;
56 else
57 file.write(reinterpret_cast<const char*>(&v), sizeof(Value));
58 }
59
60
61 Value read (unsigned int col, unsigned int line) {
62 moveTo(col, line);
63 return readHere();
64 }
65
66 Value readHere () {
67 if (sentinel >= 0) {
68 return values[sentinel];
69 }
70 else {
71 Value v;
72 file.read(reinterpret_cast<char*>(&v), sizeof(Value));
73 return v;
74 }
75 }
76
77 void destroy () {
78 file.close();
79 remove(fileName.c_str());
80 }
81
82 };
83
84 #endif