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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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1 /**********************************************************
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2
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3 The AnaGram Class Library
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4
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5 The AgReference Class
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6 Copyright 1997 Parsifal Software. All Rights Reserved.
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7 See the file COPYING for license and usage terms.
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8
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9 ***********************************************************/
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10
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11
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12 #ifndef AGREF_H
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13 #define AGREF_H
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14
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15 #include "assert.h"
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16
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17
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18 class AgReferenceCount {
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19 private:
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20 int count;
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21 public:
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22 AgReferenceCount()
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23 : count(0)
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24 {}
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25 virtual ~AgReferenceCount() {
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26 assert(count == 0);
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27 }
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28 inline AgReferenceCount(const AgReferenceCount &) : count(0) {}
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29 inline AgReferenceCount &operator = (const AgReferenceCount &) {
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30 return *this;
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31 }
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32 inline void lock() {
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33 count++;
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34 }
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35 inline int unlock() {
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36 /*
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37 if (count <= 0) {
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38 LOGSECTION("AgReferenceCount::unlock");
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39 LOGV(count);
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40 }
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41 */
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42 assert(count > 0);
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43 return (--count <= 0);
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44 }
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45 };
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46
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47 class AgReferenceBase {
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48 protected:
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49 AgReferenceCount *object;
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50 void doAssignmentLocks(const AgReferenceBase &r); /* {
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51 if (object!=0 && object->unlock()) delete object;
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52 object = r.object;
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53 if (object != 0) object->lock();
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54 }
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55 */
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56 public:
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57 AgReferenceBase();// : object(0) {}
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58 AgReferenceBase(AgReferenceCount* object_);
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59 AgReferenceBase(const AgReferenceBase &r);
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60 virtual ~AgReferenceBase();
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61 int exists() const;
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62 void discardData();
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63 /*
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64 AgReferenceBase(AgReferenceCount* object_)
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65 : object(object_)
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66 {
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67 if (object != 0) object->lock();
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68 }
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69 AgReferenceBase(const AgReferenceBase &r)
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70 : object(r.object)
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71 {
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72 if (object!= 0) object->lock();
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73 }
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74 virtual ~AgReferenceBase() {
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75 if (object!= 0 && object->unlock()) delete object;
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76 }
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77
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78 int exists() const {
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79 return object != 0;
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80 }
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81 void discardData() {
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82 if (object && object->unlock()) delete object;
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83 object = 0;
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84 }
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85 */
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86 };
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87 /*
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88 template <class T>
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89 class AgReference : public AgReferenceBase {
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90 public:
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91 inline AgReference() : AgReferenceBase() {}
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92 inline AgReference(T *x) : AgReferenceBase(x) {}
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93 inline AgReference(const AgReference<T> &r)
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94 : AgReferenceBase((const AgReferenceBase &)r)
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95 {}
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96 inline AgReference<T> &operator = (const AgReference<T> &t) {
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97 doAssignmentLocks(t);
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98 return *this;
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99 }
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100 inline T *operator -> () const {
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101 return (T *) object;
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102 }
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103 inline T *pointer() const {
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104 return (T *) object;
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105 }
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106 };
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107 */
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108
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109
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110 #endif /* AGREF_H */