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annotate anagram/support/agstack.h @ 6:607e3be6bad8

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Adjust to the moving target called the C++ standard. Apparently nowadays it's not allowed to define an explicit copy constructor but not an assignment operator. Consequently, defining the explicit copy constructor in terms of the implicit/automatic assignment operator for general convenience no longer works. Add assignment operators. Caution: not tested with the IBM compiler, but there's no particular reason it shouldn't work.
author David A. Holland
date Mon, 30 May 2022 23:46:22 -0400
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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 AgStackStorage 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 #ifndef AGSTACK_H
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12 #define AGSTACK_H
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13
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14 #include <stdlib.h>
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15 #include "port.h"
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16
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17 #include "agcontainer.h"
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18
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19
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20 template <class T>
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21 class AgStack;
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22
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23 class AgStackStorage {
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24 private:
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25 void *buffer; // active buffer
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26 AgStack<void *> *bufferStack; // buffer stack
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27 unsigned count; // number of items stacked
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28 unsigned usage; // usage count
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29 unsigned short quantum; // size of item
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30 unsigned short bufferSize; // buffer size
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31 unsigned short mask; // bufferSize - 1
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32 unsigned short index; // number of items in current buffer
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33 unsigned char logSize; // log2 of bufferSize
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34 unsigned char bsLogSize; // log2 bufferStack->bufferSize
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35
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36 public:
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37
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38 // Constructor
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39 AgStackStorage(const unsigned quantum_,
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40 const unsigned logSize_,
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41 const unsigned bsLogSize_);
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42 // Destructor
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43 ~AgStackStorage();
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44
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45 inline void *operator new(size_t n) { return malloc(n); }
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46 inline void operator delete(void *p) { free(p); }
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47
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48 AgStackStorage &discardData();
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49 AgStackStorage &discardData(unsigned n);
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50
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51 unsigned size() const {
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52 return count; // number of items stacked
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53 }
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54
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55 // Push operator
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56 void *push();
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57
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58 // Pop operator
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59 void *pop();
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60
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61 void *locate(const unsigned n) const;
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62
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63 void lock() {
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64 usage++;
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65 }
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66 int unlock() {
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67 return --usage == 0;
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68 }
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69 };
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70
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71 template <class T>
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72 class AgClassWrapper {
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73 private:
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74 T data;
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75
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76 public:
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77 AgClassWrapper(const T &t);
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78 void *operator new(size_t, void *where) {
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79 return where;
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80 }
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81 void operator delete(void *) {}
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82 operator T () const;
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83 };
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84
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85 template <class T>
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86 class AgStack : public AgIndexedContainer<T>
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87 {
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88 private:
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89 AgStackStorage *store;
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90
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91 public:
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92 AgStack(unsigned logSize = 8, unsigned bsLogSize = 8);
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93 AgStack(const AgStack<T> &s);
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94
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95 void *operator new(size_t n) { return malloc(n); }
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96 void operator delete(void *p) { free(p); }
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97 AgStack<T> &operator =(const AgStack<T> &s);
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98 ~AgStack();
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99 unsigned size() const {
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100 return store->size();
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101 }
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102
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103 AgStack<T> &push(const T &t);
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104 // AgStack<T> &operator << (const T &t);
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105 AgStack<T> &pop(T &t);
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106 T pop();
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107
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108 T &operator[] (const unsigned n) {
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109 return *(T *)store->locate(n);
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110 }
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111 const T &operator[] (const unsigned n) const {
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112 return *(T *)store->locate(n);
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113 }
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114 T &top() {
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115 return (*this)[size() - 1];
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116 }
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117
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118 AgStack<T> &discardData(unsigned n);
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119 AgStack<T> &discardData() {
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120 discardData(size());
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121 return *this;
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122 }
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123 AgStack<T> &reset() {
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124 discardData();
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125 return *this;
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126 }
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127 int operator < (const AgStack<T> &s) const;
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128 };
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129
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130
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131 #endif /* AGSTACK_H */