dburgess | 82c46ff | 2011-10-07 02:40:51 +0000 | [diff] [blame] | 1 | /**@file Simplified Vector template with aliases. */ |
| 2 | /* |
| 3 | * Copyright 2008 Free Software Foundation, Inc. |
| 4 | * |
| 5 | * This software is distributed under the terms of the GNU Affero Public License. |
| 6 | * See the COPYING file in the main directory for details. |
| 7 | * |
| 8 | * This use of this software may be subject to additional restrictions. |
| 9 | * See the LEGAL file in the main directory for details. |
| 10 | |
| 11 | This program is free software: you can redistribute it and/or modify |
| 12 | it under the terms of the GNU Affero General Public License as published by |
| 13 | the Free Software Foundation, either version 3 of the License, or |
| 14 | (at your option) any later version. |
| 15 | |
| 16 | This program is distributed in the hope that it will be useful, |
| 17 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | GNU Affero General Public License for more details. |
| 20 | |
| 21 | You should have received a copy of the GNU Affero General Public License |
| 22 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 23 | |
| 24 | */ |
| 25 | |
| 26 | |
| 27 | |
| 28 | |
| 29 | #ifndef VECTOR_H |
| 30 | #define VECTOR_H |
| 31 | |
| 32 | #include <string.h> |
| 33 | #include <iostream> |
| 34 | #include <assert.h> |
kurtis.heimerl | 5a87247 | 2013-05-31 21:47:25 +0000 | [diff] [blame] | 35 | // We cant use Logger.h in this file... |
| 36 | extern int gVectorDebug; |
| 37 | #define BVDEBUG(msg) if (gVectorDebug) {std::cout << msg;} |
| 38 | |
dburgess | 82c46ff | 2011-10-07 02:40:51 +0000 | [diff] [blame] | 39 | |
| 40 | |
| 41 | /** |
| 42 | A simplified Vector template with aliases. |
| 43 | Unlike std::vector, this class does not support dynamic resizing. |
| 44 | Unlike std::vector, this class does support "aliases" and subvectors. |
| 45 | */ |
| 46 | template <class T> class Vector { |
| 47 | |
| 48 | // TODO -- Replace memcpy calls with for-loops. |
| 49 | |
| 50 | public: |
| 51 | |
| 52 | /**@name Iterator types. */ |
| 53 | //@{ |
| 54 | typedef T* iterator; |
| 55 | typedef const T* const_iterator; |
| 56 | //@} |
| 57 | |
| 58 | protected: |
| 59 | |
| 60 | T* mData; ///< allocated data block, if any |
| 61 | T* mStart; ///< start of useful data |
| 62 | T* mEnd; ///< end of useful data + 1 |
| 63 | |
| 64 | public: |
| 65 | |
kurtis.heimerl | 5a87247 | 2013-05-31 21:47:25 +0000 | [diff] [blame] | 66 | /**** |
| 67 | char *inspect() { |
| 68 | static char buf[100]; |
| 69 | sprintf(buf," mData=%p mStart=%p mEnd=%p ",mData,mStart,mEnd); |
| 70 | return buf; |
| 71 | } |
| 72 | ***/ |
| 73 | |
dburgess | 82c46ff | 2011-10-07 02:40:51 +0000 | [diff] [blame] | 74 | /** Return the size of the Vector. */ |
| 75 | size_t size() const |
| 76 | { |
| 77 | assert(mStart>=mData); |
| 78 | assert(mEnd>=mStart); |
| 79 | return mEnd - mStart; |
| 80 | } |
| 81 | |
| 82 | /** Return size in bytes. */ |
| 83 | size_t bytes() const { return size()*sizeof(T); } |
| 84 | |
| 85 | /** Change the size of the Vector, discarding content. */ |
| 86 | void resize(size_t newSize) |
| 87 | { |
| 88 | if (mData!=NULL) delete[] mData; |
| 89 | if (newSize==0) mData=NULL; |
| 90 | else mData = new T[newSize]; |
| 91 | mStart = mData; |
| 92 | mEnd = mStart + newSize; |
| 93 | } |
| 94 | |
Alexander Chemeris | f0189c4 | 2017-03-18 14:08:43 -0700 | [diff] [blame] | 95 | /** Reduce addressable size of the Vector, keeping content. */ |
| 96 | void shrink(size_t newSize) |
| 97 | { |
| 98 | assert(newSize <= mEnd - mStart); |
| 99 | mEnd = mStart + newSize; |
| 100 | } |
| 101 | |
dburgess | 82c46ff | 2011-10-07 02:40:51 +0000 | [diff] [blame] | 102 | /** Release memory and clear pointers. */ |
| 103 | void clear() { resize(0); } |
| 104 | |
| 105 | |
| 106 | /** Copy data from another vector. */ |
| 107 | void clone(const Vector<T>& other) |
| 108 | { |
| 109 | resize(other.size()); |
Pau Espin Pedrol | 5e68cde | 2018-08-30 20:45:14 +0200 | [diff] [blame] | 110 | other.copyTo(*this); |
dburgess | 82c46ff | 2011-10-07 02:40:51 +0000 | [diff] [blame] | 111 | } |
| 112 | |
| 113 | |
| 114 | |
| 115 | |
| 116 | //@{ |
| 117 | |
| 118 | /** Build an empty Vector of a given size. */ |
| 119 | Vector(size_t wSize=0):mData(NULL) { resize(wSize); } |
| 120 | |
Tom Tsou | 87d158c | 2017-06-16 10:21:16 -0700 | [diff] [blame] | 121 | /** Build a Vector by moving another. */ |
| 122 | Vector(Vector<T>&& other) |
dburgess | 82c46ff | 2011-10-07 02:40:51 +0000 | [diff] [blame] | 123 | :mData(other.mData),mStart(other.mStart),mEnd(other.mEnd) |
| 124 | { other.mData=NULL; } |
| 125 | |
| 126 | /** Build a Vector by copying another. */ |
| 127 | Vector(const Vector<T>& other):mData(NULL) { clone(other); } |
| 128 | |
| 129 | /** Build a Vector with explicit values. */ |
| 130 | Vector(T* wData, T* wStart, T* wEnd) |
| 131 | :mData(wData),mStart(wStart),mEnd(wEnd) |
| 132 | { } |
| 133 | |
| 134 | /** Build a vector from an existing block, NOT to be deleted upon destruction. */ |
| 135 | Vector(T* wStart, size_t span) |
| 136 | :mData(NULL),mStart(wStart),mEnd(wStart+span) |
| 137 | { } |
| 138 | |
| 139 | /** Build a Vector by concatenation. */ |
| 140 | Vector(const Vector<T>& other1, const Vector<T>& other2) |
| 141 | :mData(NULL) |
| 142 | { |
| 143 | resize(other1.size()+other2.size()); |
| 144 | memcpy(mStart, other1.mStart, other1.bytes()); |
| 145 | memcpy(mStart+other1.size(), other2.mStart, other2.bytes()); |
| 146 | } |
| 147 | |
| 148 | //@} |
| 149 | |
| 150 | /** Destroy a Vector, deleting held memory. */ |
| 151 | ~Vector() { clear(); } |
| 152 | |
| 153 | |
| 154 | |
| 155 | |
| 156 | //@{ |
| 157 | |
| 158 | /** Assign from another Vector, shifting ownership. */ |
| 159 | void operator=(Vector<T>& other) |
| 160 | { |
| 161 | clear(); |
| 162 | mData=other.mData; |
| 163 | mStart=other.mStart; |
| 164 | mEnd=other.mEnd; |
| 165 | other.mData=NULL; |
| 166 | } |
| 167 | |
| 168 | /** Assign from another Vector, copying. */ |
| 169 | void operator=(const Vector<T>& other) { clone(other); } |
| 170 | |
| 171 | //@} |
| 172 | |
| 173 | |
| 174 | //@{ |
| 175 | |
| 176 | /** Return an alias to a segment of this Vector. */ |
| 177 | Vector<T> segment(size_t start, size_t span) |
| 178 | { |
| 179 | T* wStart = mStart + start; |
| 180 | T* wEnd = wStart + span; |
| 181 | assert(wEnd<=mEnd); |
| 182 | return Vector<T>(NULL,wStart,wEnd); |
| 183 | } |
| 184 | |
| 185 | /** Return an alias to a segment of this Vector. */ |
| 186 | const Vector<T> segment(size_t start, size_t span) const |
| 187 | { |
| 188 | T* wStart = mStart + start; |
| 189 | T* wEnd = wStart + span; |
| 190 | assert(wEnd<=mEnd); |
| 191 | return Vector<T>(NULL,wStart,wEnd); |
| 192 | } |
| 193 | |
| 194 | Vector<T> head(size_t span) { return segment(0,span); } |
| 195 | const Vector<T> head(size_t span) const { return segment(0,span); } |
| 196 | Vector<T> tail(size_t start) { return segment(start,size()-start); } |
| 197 | const Vector<T> tail(size_t start) const { return segment(start,size()-start); } |
| 198 | |
| 199 | /** |
| 200 | Copy part of this Vector to a segment of another Vector. |
| 201 | @param other The other vector. |
| 202 | @param start The start point in the other vector. |
| 203 | @param span The number of elements to copy. |
| 204 | */ |
| 205 | void copyToSegment(Vector<T>& other, size_t start, size_t span) const |
| 206 | { |
| 207 | T* base = other.mStart + start; |
| 208 | assert(base+span<=other.mEnd); |
| 209 | assert(mStart+span<=mEnd); |
| 210 | memcpy(base,mStart,span*sizeof(T)); |
| 211 | } |
| 212 | |
| 213 | /** Copy all of this Vector to a segment of another Vector. */ |
| 214 | void copyToSegment(Vector<T>& other, size_t start=0) const { copyToSegment(other,start,size()); } |
| 215 | |
| 216 | void copyTo(Vector<T>& other) const { copyToSegment(other,0,size()); } |
| 217 | |
| 218 | /** |
| 219 | Copy a segment of this vector into another. |
| 220 | @param other The other vector (to copt into starting at 0.) |
| 221 | @param start The start point in this vector. |
| 222 | @param span The number of elements to copy. |
| 223 | */ |
| 224 | void segmentCopyTo(Vector<T>& other, size_t start, size_t span) const |
| 225 | { |
| 226 | const T* base = mStart + start; |
| 227 | assert(base+span<=mEnd); |
| 228 | assert(other.mStart+span<=other.mEnd); |
| 229 | memcpy(other.mStart,base,span*sizeof(T)); |
| 230 | } |
| 231 | |
Alexander Chemeris | c708816 | 2017-03-18 13:43:22 -0700 | [diff] [blame] | 232 | /** |
| 233 | Move (copy) a segment of this vector into a different position in the vector |
| 234 | @param from Start point from which to copy. |
| 235 | @param to Start point to which to copy. |
| 236 | @param span The number of elements to copy. |
| 237 | */ |
| 238 | void segmentMove(size_t from, size_t to, size_t span) |
| 239 | { |
| 240 | const T* baseFrom = mStart + from; |
| 241 | T* baseTo = mStart + to; |
| 242 | assert(baseFrom+span<=mEnd); |
| 243 | assert(baseTo+span<=mEnd); |
| 244 | memmove(baseTo,baseFrom,span*sizeof(T)); |
| 245 | } |
| 246 | |
dburgess | 82c46ff | 2011-10-07 02:40:51 +0000 | [diff] [blame] | 247 | void fill(const T& val) |
| 248 | { |
| 249 | T* dp=mStart; |
| 250 | while (dp<mEnd) *dp++=val; |
| 251 | } |
| 252 | |
| 253 | void fill(const T& val, unsigned start, unsigned length) |
| 254 | { |
| 255 | T* dp=mStart+start; |
| 256 | T* end=dp+length; |
| 257 | assert(end<=mEnd); |
| 258 | while (dp<end) *dp++=val; |
| 259 | } |
| 260 | |
| 261 | |
| 262 | //@} |
| 263 | |
| 264 | |
| 265 | //@{ |
| 266 | |
| 267 | T& operator[](size_t index) |
| 268 | { |
| 269 | assert(mStart+index<mEnd); |
| 270 | return mStart[index]; |
| 271 | } |
| 272 | |
| 273 | const T& operator[](size_t index) const |
| 274 | { |
| 275 | assert(mStart+index<mEnd); |
| 276 | return mStart[index]; |
| 277 | } |
| 278 | |
| 279 | const T* begin() const { return mStart; } |
| 280 | T* begin() { return mStart; } |
| 281 | const T* end() const { return mEnd; } |
| 282 | T* end() { return mEnd; } |
kurtis.heimerl | 5a87247 | 2013-05-31 21:47:25 +0000 | [diff] [blame] | 283 | bool isOwner() { return !!mData; } // Do we own any memory ourselves? |
dburgess | 82c46ff | 2011-10-07 02:40:51 +0000 | [diff] [blame] | 284 | //@} |
Pau Espin Pedrol | 21ce05c | 2018-08-30 20:47:20 +0200 | [diff] [blame^] | 285 | |
dburgess | 82c46ff | 2011-10-07 02:40:51 +0000 | [diff] [blame] | 286 | |
| 287 | }; |
| 288 | |
| 289 | |
| 290 | |
| 291 | |
| 292 | /** Basic print operator for Vector objects. */ |
| 293 | template <class T> |
| 294 | std::ostream& operator<<(std::ostream& os, const Vector<T>& v) |
| 295 | { |
| 296 | for (unsigned i=0; i<v.size(); i++) os << v[i] << " "; |
| 297 | return os; |
| 298 | } |
| 299 | |
| 300 | |
| 301 | |
| 302 | #endif |
| 303 | // vim: ts=4 sw=4 |