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annotate anagram/support/pointer.h @ 21:1c9dac05d040

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Add lint-style FALLTHROUGH annotations to fallthrough cases. (in the parse engine and thus the output code) Document this, because the old output causes warnings with gcc10.
author David A. Holland
date Mon, 13 Jun 2022 00:04:38 -0400
parents 13d2b8934445
children
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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 */