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annotate oldclasslib/include/util.h @ 16:f9e4689b837d

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Some minor updates for 15 years later.
author David A. Holland
date Tue, 31 May 2022 01:45:26 -0400
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1 /*
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2 * AnaGram, a System for Syntax Directed Programming
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3 *
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4 * Utility Class Definitions
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5 * For copying, clearing, protecting and duplicating arrays.
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6 *
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7 * These class definitions are complete within this file.
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8 * There is no corresponding CPP module.
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9 *
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10 * Copyright 1993 Parsifal Software. All Rights Reserved.
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11 *
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12 * This software is provided 'as-is', without any express or implied
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13 * warranty. In no event will the authors be held liable for any damages
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14 * arising from the use of this software.
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15 *
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16 * Permission is granted to anyone to use this software for any purpose,
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17 * including commercial applications, and to alter it and redistribute it
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18 * freely, subject to the following restrictions:
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19 *
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20 * 1. The origin of this software must not be misrepresented; you must not
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21 * claim that you wrote the original software. If you use this software
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22 * in a product, an acknowledgment in the product documentation would be
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23 * appreciated but is not required.
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24 * 2. Altered source versions must be plainly marked as such, and must not be
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25 * misrepresented as being the original software.
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26 * 3. This notice may not be removed or altered from any source distribution.
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27 */
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28
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29 #ifndef UTIL_H
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30 #define UTIL_H
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31
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32 #include <string.h>
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33
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34 // General purpose copy procedure. Works with pointers of any type.
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35
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36 template<class T>
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37 void copy(T *dest, const T *src, unsigned n) {
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38 memmove(dest, src, n*sizeof(T));
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39 }
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40
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41 template<class T>
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42 void copy(T *dest, const T *src) {
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43 memmove(dest, src, sizeof(T));
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44 }
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45
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46 // Clear an array to zero
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47
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48 template <class T>
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49 T *clear(T *dest, unsigned n) {
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50 memset(dest, 0, n*sizeof(T));
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51 return dest;
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52 }
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53
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54 template <class T>
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55 T *clear(T *dest) {
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56 memset(dest, 0, sizeof(T));
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57 return dest;
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58 }
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59
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60 // Make a duplicate of any array
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61
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62 template <class T>
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63 T *memdup(const T *src, unsigned n) {
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64 T *result = new T[n];
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65 memmove(result, src, n*sizeof(T));
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66 return result;
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67 }
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68
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69 // General purpose class for saving and restoring data arrays
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70
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71 template <class T>
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72 class protect {
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73 private:
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74 T *save_value;
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75 unsigned n;
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76 T *original_pointer;
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77
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78 public:
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79 protect(T *p, unsigned k) {
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80 save_value = new T[n = k];
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81 copy(save_value, p, n);
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82 original_pointer = p;
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83 }
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84 protect(T *p) {
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85 save_value = new T[n = 1];
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86 copy(save_value, p, n);
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87 original_pointer = p;
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88 }
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89 ~protect() {
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90 copy(original_pointer, save_value, n);
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91 delete [] save_value;
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92 }
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93 };
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94
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95 #endif