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annotate liboctave/oct-mem.h @ 14626:f947d2922feb stable rc-3-6-2-0

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3.6.2-rc0 release candidate * configure.ac (AC_INIT): Version is now 3.6.2-rc0. (OCTAVE_RELEASE_DATE): Now 2012-05-11.
author John W. Eaton <jwe@octave.org>
date Fri, 11 May 2012 13:46:18 -0400
parents 72c96de7a403
children 460a3c6d8bf1
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1 /*
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2
14138
72c96de7a403 maint: update copyright notices for 2012
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3 Copyright (C) 2009-2012 VZLU Prague
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4
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5 This file is part of Octave.
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6
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7 Octave is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 3 of the License, or (at your
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10 option) any later version.
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11
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12 Octave is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #if !defined (octave_memory_h)
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24 #define octave_memory_h 1
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25
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26 #include <cstddef>
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27 #include <cstring>
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28 #include <algorithm>
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29
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30 #include "oct-cmplx.h"
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31 #include "oct-inttypes.h"
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32
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33 // NOTE: These functions are used to optimize stuff where performance is a
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34 // priority. They assume that the std::complex and octave_int can be
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35 // manipulated as plain memory, an assumption that is always true in practice
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36 // but not theoretically guaranteed by the C++ standard. In the future, C++ may
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37 // provide a better way to accomplish these tasks.
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38
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39 inline size_t safe_size_comp (size_t n, size_t size)
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40 {
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41 if (n > static_cast<size_t> (-1) / size)
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42 throw std::bad_alloc ();
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43 return n * size;
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44 }
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45
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46 // Unaliased copy. This boils down to memcpy, even for octave_int and complex types.
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47
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48 template <class T>
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49 inline void copy_or_memcpy (size_t n, const T *src, T *dest)
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50 { std::copy (src, src + n, dest); }
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51
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52 #define DEFINE_POD_UCOPY(T) \
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53 inline void copy_or_memcpy (size_t n, const T *src, T *dest) \
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54 { std::memcpy (dest, src, n * sizeof (T)); }
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55
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56 DEFINE_POD_UCOPY (double)
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57 DEFINE_POD_UCOPY (float)
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58 DEFINE_POD_UCOPY (char)
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59 DEFINE_POD_UCOPY (short)
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60 DEFINE_POD_UCOPY (int)
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61 DEFINE_POD_UCOPY (long)
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62 DEFINE_POD_UCOPY (unsigned char)
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63 DEFINE_POD_UCOPY (unsigned short)
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64 DEFINE_POD_UCOPY (unsigned int)
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65 DEFINE_POD_UCOPY (unsigned long)
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66
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67 DEFINE_POD_UCOPY (Complex)
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68 DEFINE_POD_UCOPY (FloatComplex)
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69
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70 template <class T>
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71 DEFINE_POD_UCOPY (octave_int<T>)
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72
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73 // Fill by value, with a check for zero. This boils down to memset if value is
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74 // a POD zero.
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75 template <class T>
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76 inline void fill_or_memset (size_t n, const T& value, T *dest)
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77 { std::fill_n (dest, n, value); }
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78
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79 template <class T>
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80 inline bool helper_is_zero_mem (const T& value)
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81 {
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82 typedef typename query_integer_type<sizeof (T), false>::type IT; // get integer type of the same size.
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83 return *(reinterpret_cast<const IT *>(&value)) == 0;
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84 }
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85
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86 template <class T>
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87 inline bool helper_is_zero_mem (const std::complex<T>& value)
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88 {
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89 return (helper_is_zero_mem (value.real ())
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90 && helper_is_zero_mem (value.imag ()));
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91 }
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92
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93 template <class T>
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94 inline bool helper_is_zero_mem (const octave_int<T>& value)
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95 { return value.value () == T(); }
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96
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97 #define DEFINE_POD_FILL(T) \
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98 inline void fill_or_memset (size_t n, const T& value, T *dest) \
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99 { \
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100 if (helper_is_zero_mem (value)) \
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101 std::memset (dest, 0, n * sizeof (T)); \
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102 else \
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103 std::fill_n (dest, n, value); \
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104 }
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105
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106 DEFINE_POD_FILL (double)
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107 DEFINE_POD_FILL (float)
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108 DEFINE_POD_FILL (char)
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109 DEFINE_POD_FILL (short)
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110 DEFINE_POD_FILL (int)
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111 DEFINE_POD_FILL (long)
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112 DEFINE_POD_FILL (unsigned char)
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113 DEFINE_POD_FILL (unsigned short)
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114 DEFINE_POD_FILL (unsigned int)
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115 DEFINE_POD_FILL (unsigned long)
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116
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117 DEFINE_POD_FILL (Complex)
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118 DEFINE_POD_FILL (FloatComplex)
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119
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120 template <class T>
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121 DEFINE_POD_FILL (octave_int<T>)
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122
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123 // Uninitialized allocation. Will not initialize memory for complex and octave_int.
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124 // Memory allocated by octave_new should be freed by octave_delete.
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125 template <class T>
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126 inline T *no_ctor_new (size_t n)
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127 {
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128 // Some systems let us allocate > 2GB memory even though size_t, which is either
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129 // buggy or completely cuckoo, so let's check here to stay safe.
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130 safe_size_comp (n, sizeof (T));
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131 return new T[n];
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132 }
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133 template <class T>
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134 inline void no_ctor_delete (T *ptr)
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135 { delete [] ptr; }
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136
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137 #define DEFINE_POD_NEW_DELETE(T) \
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138 template <> \
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139 inline T *no_ctor_new<T > (size_t n) \
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140 { return reinterpret_cast<T *> (new char[safe_size_comp (n, sizeof (T))]); } \
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141 template <> \
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142 inline void no_ctor_delete<T > (T *ptr) \
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143 { delete [] reinterpret_cast<char *> (ptr); }
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144
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145 DEFINE_POD_NEW_DELETE (Complex)
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146 DEFINE_POD_NEW_DELETE (FloatComplex)
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147
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148 DEFINE_POD_NEW_DELETE (octave_int8)
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149 DEFINE_POD_NEW_DELETE (octave_int16)
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150 DEFINE_POD_NEW_DELETE (octave_int32)
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151 DEFINE_POD_NEW_DELETE (octave_int64)
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152 DEFINE_POD_NEW_DELETE (octave_uint8)
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153 DEFINE_POD_NEW_DELETE (octave_uint16)
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154 DEFINE_POD_NEW_DELETE (octave_uint32)
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155 DEFINE_POD_NEW_DELETE (octave_uint64)
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156
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157 #endif /* octave_memory_h */