1 | // -*- C++ -*- |
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2 | /*************************************************************************** |
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3 | * blitz/veciter.h Iterator classes for Vector<P_numtype> |
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4 | * |
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5 | * $Id: veciter.h,v 1.5 2005/05/07 04:17:56 julianc Exp $ |
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6 | * |
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7 | * Copyright (C) 1997-2001 Todd Veldhuizen <tveldhui@oonumerics.org> |
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8 | * |
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9 | * This program is free software; you can redistribute it and/or |
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10 | * modify it under the terms of the GNU General Public License |
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11 | * as published by the Free Software Foundation; either version 2 |
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12 | * of the License, or (at your option) any later version. |
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13 | * |
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14 | * This program is distributed in the hope that it will be useful, |
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15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 | * GNU General Public License for more details. |
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18 | * |
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19 | * Suggestions: blitz-dev@oonumerics.org |
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20 | * Bugs: blitz-bugs@oonumerics.org |
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21 | * |
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22 | * For more information, please see the Blitz++ Home Page: |
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23 | * http://oonumerics.org/blitz/ |
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24 | * |
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25 | ***************************************************************************/ |
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26 | |
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27 | |
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28 | #ifndef BZ_VECITER_H |
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29 | #define BZ_VECITER_H |
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30 | |
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31 | #ifndef BZ_VECTOR_H |
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32 | #error <blitz/veciter.h> should be included via <blitz/vector.h> |
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33 | #endif |
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34 | |
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35 | BZ_NAMESPACE(blitz) |
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36 | |
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37 | // Declaration of class VectorIter |
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38 | template<typename P_numtype> |
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39 | class VectorIter { |
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40 | public: |
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41 | typedef P_numtype T_numtype; |
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42 | |
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43 | explicit VectorIter(Vector<P_numtype>& x) |
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44 | : data_(x.data()) |
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45 | { |
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46 | stride_ = x.stride(); |
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47 | length_ = x.length(); |
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48 | } |
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49 | |
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50 | VectorIter(P_numtype* restrict data, int stride, int length) |
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51 | : data_(data), stride_(stride), length_(length) |
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52 | { } |
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53 | |
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54 | #ifdef BZ_MANUAL_VECEXPR_COPY_CONSTRUCTOR |
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55 | VectorIter(const VectorIter<P_numtype>& x) |
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56 | { |
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57 | data_ = x.data_; |
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58 | stride_ = x.stride_; |
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59 | length_ = x.length_; |
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60 | } |
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61 | #endif |
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62 | |
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63 | P_numtype operator[](int i) const |
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64 | { |
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65 | BZPRECONDITION(i < length_); |
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66 | return data_[i*stride_]; |
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67 | } |
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68 | |
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69 | P_numtype& restrict operator[](int i) |
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70 | { |
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71 | BZPRECONDITION(i < length_); |
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72 | return data_[i*stride_]; |
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73 | } |
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74 | |
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75 | P_numtype operator()(int i) const |
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76 | { |
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77 | BZPRECONDITION(i < length_); |
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78 | return data_[i*stride_]; |
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79 | } |
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80 | |
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81 | P_numtype& restrict operator()(int i) |
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82 | { |
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83 | BZPRECONDITION(i < length_); |
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84 | return data_[i*stride_]; |
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85 | } |
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86 | |
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87 | P_numtype operator*() const |
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88 | { return *data_; } |
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89 | |
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90 | P_numtype& operator*() |
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91 | { return *data_; } |
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92 | |
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93 | VectorIter<P_numtype> operator+(int i) |
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94 | { |
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95 | // NEEDS_WORK -- precondition checking? |
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96 | return VectorIter<P_numtype>(data_+i*stride_, stride_, length_-i); |
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97 | } |
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98 | |
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99 | int length(int) const |
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100 | { return length_; } |
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101 | |
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102 | bool isUnitStride() const |
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103 | { return (stride_ == 1); } |
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104 | |
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105 | ///////////////////////////////////////////// |
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106 | // Library-internal member functions |
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107 | // These are undocumented and may change or |
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108 | // disappear in future releases. |
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109 | ///////////////////////////////////////////// |
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110 | |
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111 | static const int |
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112 | _bz_staticLengthCount = 0, |
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113 | _bz_dynamicLengthCount = 1, |
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114 | _bz_staticLength = 0; |
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115 | |
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116 | bool _bz_hasFastAccess() const |
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117 | { return isUnitStride(); } |
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118 | |
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119 | P_numtype _bz_fastAccess(int i) const |
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120 | { return data_[i]; } |
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121 | |
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122 | P_numtype& restrict _bz_fastAccess(int i) |
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123 | { return data_[i]; } |
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124 | |
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125 | int _bz_suggestLength() const |
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126 | { return length_; } |
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127 | |
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128 | private: |
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129 | VectorIter() { } |
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130 | P_numtype * restrict data_; |
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131 | int stride_; |
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132 | int length_; |
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133 | }; |
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134 | |
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135 | |
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136 | template<typename P_numtype> |
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137 | class VectorIterConst { |
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138 | public: |
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139 | typedef P_numtype T_numtype; |
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140 | |
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141 | explicit VectorIterConst(const Vector<P_numtype>& x) |
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142 | : data_(x.data()) |
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143 | { |
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144 | stride_ = x.stride(); |
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145 | length_ = x.length(); |
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146 | } |
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147 | |
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148 | #ifdef BZ_MANUAL_VECEXPR_COPY_CONSTRUCTOR |
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149 | VectorIterConst(const VectorIterConst<P_numtype>& x) |
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150 | { |
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151 | data_ = x.data_; |
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152 | stride_ = x.stride_; |
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153 | length_ = x.length_; |
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154 | } |
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155 | #endif |
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156 | |
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157 | P_numtype operator[](int i) const |
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158 | { |
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159 | BZPRECONDITION(i < length_); |
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160 | return data_[i*stride_]; |
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161 | } |
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162 | |
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163 | P_numtype operator()(int i) const |
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164 | { |
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165 | BZPRECONDITION(i < length_); |
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166 | return data_[i*stride_]; |
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167 | } |
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168 | |
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169 | int length(int) const |
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170 | { return length_; } |
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171 | |
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172 | bool isUnitStride() const |
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173 | { return (stride_ == 1); } |
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174 | |
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175 | ///////////////////////////////////////////// |
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176 | // Library-internal member functions |
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177 | // These are undocumented and may change or |
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178 | // disappear in future releases. |
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179 | ///////////////////////////////////////////// |
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180 | |
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181 | static const int |
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182 | _bz_staticLengthCount = 0, |
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183 | _bz_dynamicLengthCount = 1, |
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184 | _bz_staticLength = 0; |
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185 | |
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186 | bool _bz_hasFastAccess() const |
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187 | { return isUnitStride(); } |
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188 | |
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189 | P_numtype _bz_fastAccess(int i) const |
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190 | { |
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191 | return data_[i]; |
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192 | } |
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193 | |
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194 | int _bz_suggestLength() const |
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195 | { return length_; } |
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196 | |
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197 | private: |
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198 | const P_numtype * restrict data_; |
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199 | int stride_; |
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200 | int length_; |
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201 | }; |
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202 | |
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203 | BZ_NAMESPACE_END |
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204 | |
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205 | #endif // BZ_VECITER_H |
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