| 1 | #ifndef UTIL_H__ |
1 | #ifndef UTIL_H__ |
| 2 | #define UTIL_H__ |
2 | #define UTIL_H__ |
| 3 | |
3 | |
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4 | #if __GNUC__ >= 3 |
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5 | # define is_constant(c) __builtin_constant_p (c) |
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6 | #else |
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7 | # define is_constant(c) 0 |
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8 | #endif |
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9 | |
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10 | #include <cstddef> |
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11 | |
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12 | #include <glib.h> |
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13 | |
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14 | // use a gcc extension for auto declarations until ISO C++ sanctifies them |
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15 | #define AUTODECL(var,expr) typeof(expr) var = (expr) |
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16 | |
| 4 | // makes dynamically allocated objects zero-initialised |
17 | // makes dynamically allocated objects zero-initialised |
| 5 | struct zero_initialised |
18 | struct zero_initialised |
| 6 | { |
19 | { |
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20 | void *operator new (size_t s, void *p) |
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21 | { |
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22 | memset (p, 0, s); |
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23 | return p; |
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24 | } |
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25 | |
| 7 | void *operator new (size_t s); |
26 | void *operator new (size_t s) |
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27 | { |
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28 | return g_slice_alloc0 (s); |
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29 | } |
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30 | |
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31 | void *operator new[] (size_t s) |
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32 | { |
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33 | return g_slice_alloc0 (s); |
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34 | } |
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35 | |
| 8 | void operator delete (void *p, size_t s); |
36 | void operator delete (void *p, size_t s) |
| 9 | }; |
37 | { |
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38 | g_slice_free1 (s, p); |
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39 | } |
| 10 | |
40 | |
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41 | void operator delete[] (void *p, size_t s) |
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42 | { |
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43 | g_slice_free1 (s, p); |
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44 | } |
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45 | }; |
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46 | |
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47 | // strictly the same as g_slice_alloc, but never returns 0 |
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48 | void *salloc (int size) throw (std::bad_alloc); |
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49 | // also copies src into the new area, like "memdup" |
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50 | // if src is 0, clears the memory |
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51 | void *salloc (int size, void *src) throw (std::bad_alloc); |
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52 | |
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53 | // and as a template |
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54 | template<typename T> |
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55 | inline T *salloc (int size) throw (std::bad_alloc) { return (T *)salloc (size * sizeof (T)); } |
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56 | template<typename T> |
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57 | inline T *salloc (int size, T *src) throw (std::bad_alloc) { return (T *)salloc (size * sizeof (T), (void *)src); } |
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58 | |
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59 | // for symmetry |
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60 | template<typename T> |
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61 | inline void sfree (T *ptr, int size) throw () |
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62 | { |
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63 | g_slice_free1 (size * sizeof (T), (void *)ptr); |
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64 | } |
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65 | |
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66 | // a STL-compatible allocator that uses g_slice |
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67 | // boy, this is verbose |
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68 | template<typename Tp> |
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69 | struct slice_allocator |
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70 | { |
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71 | typedef size_t size_type; |
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72 | typedef ptrdiff_t difference_type; |
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73 | typedef Tp *pointer; |
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74 | typedef const Tp *const_pointer; |
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75 | typedef Tp &reference; |
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76 | typedef const Tp &const_reference; |
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77 | typedef Tp value_type; |
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78 | |
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79 | template <class U> |
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80 | struct rebind |
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81 | { |
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82 | typedef slice_allocator<U> other; |
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83 | }; |
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84 | |
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85 | slice_allocator () throw () { } |
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86 | slice_allocator (const slice_allocator &o) throw () { } |
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87 | template<typename Tp2> |
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88 | slice_allocator (const slice_allocator<Tp2> &) throw () { } |
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89 | |
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90 | ~slice_allocator () { } |
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91 | |
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92 | pointer address (reference x) const { return &x; } |
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93 | const_pointer address (const_reference x) const { return &x; } |
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94 | |
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95 | pointer allocate (size_type n, const_pointer = 0) |
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96 | { |
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97 | return salloc<Tp> (n); |
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98 | } |
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99 | |
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100 | void deallocate (pointer p, size_type n) |
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101 | { |
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102 | sfree<Tp> (p, n); |
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103 | } |
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104 | |
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105 | size_type max_size ()const throw () |
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106 | { |
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107 | return size_t (-1) / sizeof (Tp); |
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108 | } |
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109 | |
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110 | void construct (pointer p, const Tp &val) |
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111 | { |
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112 | ::new (p) Tp (val); |
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113 | } |
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114 | |
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115 | void destroy (pointer p) |
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116 | { |
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117 | p->~Tp (); |
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118 | } |
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119 | }; |
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120 | |
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121 | struct refcounted |
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122 | { |
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123 | refcounted () : refcnt (0) { } |
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124 | // virtual ~refcounted (); |
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125 | void refcnt_inc () { ++refcnt; } |
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126 | void refcnt_dec () { --refcnt; } |
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127 | bool dead () { return refcnt == 0; } |
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128 | mutable int refcnt; |
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129 | #if 0 |
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130 | private: |
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131 | static refcounted *rc_first; |
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132 | refcounted *rc_next; |
| 11 | #endif |
133 | #endif |
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134 | }; |
| 12 | |
135 | |
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136 | template<class T> |
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137 | struct refptr |
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138 | { |
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139 | T *p; |
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140 | |
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141 | refptr () : p(0) { } |
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142 | refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); } |
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143 | refptr (T *p) : p(p) { if (p) p->refcnt_inc (); } |
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144 | ~refptr () { if (p) p->refcnt_dec (); } |
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145 | |
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146 | const refptr<T> &operator =(T *o) |
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147 | { |
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148 | if (p) p->refcnt_dec (); |
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149 | p = o; |
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150 | if (p) p->refcnt_inc (); |
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151 | |
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152 | return *this; |
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153 | } |
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154 | |
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155 | const refptr<T> &operator =(const refptr<T> o) |
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156 | { |
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157 | *this = o.p; |
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158 | return *this; |
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159 | } |
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160 | |
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161 | T &operator * () const { return *p; } |
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162 | T *operator ->() const { return p; } |
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163 | |
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164 | operator T *() const { return p; } |
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165 | }; |
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166 | |
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167 | struct str_hash |
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168 | { |
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169 | std::size_t operator ()(const char *s) const |
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170 | { |
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171 | unsigned long hash = 0; |
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172 | |
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173 | /* use the one-at-a-time hash function, which supposedly is |
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174 | * better than the djb2-like one used by perl5.005, but |
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175 | * certainly is better then the bug used here before. |
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176 | * see http://burtleburtle.net/bob/hash/doobs.html |
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177 | */ |
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178 | while (*s) |
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179 | { |
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180 | hash += *s++; |
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181 | hash += hash << 10; |
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182 | hash ^= hash >> 6; |
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183 | } |
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184 | |
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185 | hash += hash << 3; |
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186 | hash ^= hash >> 11; |
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187 | hash += hash << 15; |
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188 | |
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189 | return hash; |
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190 | } |
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191 | }; |
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192 | |
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193 | struct str_equal |
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194 | { |
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195 | bool operator ()(const char *a, const char *b) const |
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196 | { |
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197 | return !strcmp (a, b); |
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198 | } |
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199 | }; |
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200 | |
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201 | #include <vector> |
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202 | |
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203 | template<class obj> |
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204 | struct unordered_vector : std::vector<obj, slice_allocator<obj> > |
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205 | { |
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206 | typedef typename unordered_vector::iterator iterator; |
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207 | |
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208 | void erase (unsigned int pos) |
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209 | { |
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210 | if (pos < this->size () - 1) |
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211 | (*this)[pos] = (*this)[this->size () - 1]; |
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212 | |
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213 | this->pop_back (); |
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214 | } |
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215 | |
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216 | void erase (iterator i) |
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217 | { |
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218 | erase ((unsigned int )(i - this->begin ())); |
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219 | } |
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220 | }; |
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221 | |
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222 | template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; } |
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223 | template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; } |
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224 | template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? a : v >(T)b ? b : v; } |
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225 | |
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226 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
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227 | |
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228 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
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229 | void assign (char *dst, const char *src, int maxlen); |
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230 | |
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231 | // type-safe version of assign |
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232 | template<int N> |
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233 | inline void assign (char (&dst)[N], const char *src) |
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234 | { |
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235 | assign ((char *)&dst, src, N); |
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236 | } |
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237 | |
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238 | typedef double tstamp; |
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239 | |
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240 | // return current time as timestampe |
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241 | tstamp now (); |
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242 | |
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243 | #endif |
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244 | |
