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annotate anagram/support/agstack.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
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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 */