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annotate anagram/support/pointer.h @ 0:13d2b8934445

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Import AnaGram (near-)release tree into Mercurial.
author David A. Holland
date Sat, 22 Dec 2007 17:52:45 -0500
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13d2b8934445 Import AnaGram (near-)release tree into Mercurial.
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1 /*
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2 * AnaGram, A System for Syntax Directed Programming
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3 * Copyright 1997-2002 Parsifal Software. All Rights Reserved.
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4 * See the file COPYING for license and usage terms.
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5 *
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6 * pointer.h
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7 */
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8
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9 #ifndef POINTER_H
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10 #define POINTER_H
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11
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12 template <class T>
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13 class Pointer {
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14 private:
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15 int *useCount;
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16 T *item;
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17
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18 public:
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19 Pointer(T *i) : useCount(new int), item(i) { useCount = 1; }
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20 Pointer(const Pointer<T> &x) : useCount(x.useCount), item(x.item) {
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21 (*useCount)++;
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22 }
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23 Pointer<T> &operator = (const Pointer<T> &x) {
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24 if (--(*useCount) == 0) {
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25 // XXX doesn't this leak the usecount memory?
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26 delete item;
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27 }
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28 useCount = x.useCount;
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29 item = x.item;
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30 (*useCount)++;
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31 }
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32 ~Pointer() {
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33 if (--(*useCount) == 0) {
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34 delete item;
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35 delete useCount;
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36 }
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37 }
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38 T *operator ->() { return item; }
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39 };
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40
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41 template <class T>
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42 class ArrayPointer {
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43 private:
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44 int *useCount;
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45 T *array;
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46
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47 public:
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48 ArrayPointer(T *i) : useCount(new int), array(i) { *useCount = 1; }
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49 ArrayPointer(const ArrayPointer<T> &x) : useCount(x.useCount),array(x.array){
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50 (*useCount)++;
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51 }
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52 ArrayPointer<T> &operator = (const ArrayPointer<T> &x) {
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53 if (--(*useCount) == 0) {
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54 // XXX doesn't this leak the usecount memory?
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55 delete [] array;
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56 }
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57 useCount = x.useCount;
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58 array = x.array;
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59 (*useCount)++;
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60 return *this;
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61 }
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62 ~ArrayPointer() {
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63 if (--(*useCount) == 0) {
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64 delete [] array;
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65 delete useCount;
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66 }
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67 }
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68 const T &operator [] (const int x) const { return array[x]; }
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69 T &operator [] (const int x) { return array[x]; }
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70 operator const T *() const { return array; }
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71 operator T *() { return array; }
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72 };
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73
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74
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75 #endif /* POINTER_H */