source: source/ariba/utility/vtypes/detail/vint_small.hpp@ 10700

Last change on this file since 10700 was 10700, checked in by Michael Tänzer, 12 years ago

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1// vint_small.hpp, created on 01.12.2008 by Sebastian Mies
2// [The FreeBSD Licence]
3//
4// Copyright (c) 2008
5// Sebastian Mies, Institute of Telematics, UniversitÀt Karlsruhe (TH)
6// All rights reserved.
7//
8// Redistribution and use in source and binary forms, with or without
9// modification, are permitted provided that the following conditions are
10// met:
11//
12// * Redistributions of source code must retain the above copyright notice,
13// this list of conditions and the following disclaimer.
14// * Redistributions in binary form must reproduce the above copyright
15// notice, this list of conditions and the following disclaimer in the
16// documentation and/or other materials provided with the distribution.
17// * Neither the name of the author nor the names of its contributors may be
18// used to endorse or promote products derived from this software without
19// specific prior written permission.
20//
21// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
22// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
23// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
25// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
26// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
28// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
31// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32//
33
34#ifndef VINT_SMALL_HPP_
35#define VINT_SMALL_HPP_
36
37#include<boost/mpl/if.hpp>
38#include<boost/integer.hpp>
39
40#include "helper.hpp"
41#include <cmath>
42
43#define NO_INT64
44
45using boost::mpl::if_;
46using boost::mpl::bool_;
47
48namespace _vint {
49namespace detail {
50 template<size_t l, bool s> class vint_small;
51}} // namespace _vint::detail
52
53template<size_t l, bool s>
54std::ostream& operator<<(std::ostream& os, const _vint::detail::vint_small<l, s>& v);
55
56namespace _vint {
57namespace detail {
58
59/**
60 * This class implements a integer wrapper for native integer types
61 * and adapts it to integers which do not have a length divideable by
62 * a power of 2. In this case bits are masked out to mimic the behaviour
63 * of a real variable small integer.
64 *
65 * SIGNED values are currently unsupported!!!
66 *
67 * @autor Sebastian Mies
68 */
69template<size_t __length = 0, bool __sign = false>
70class vint_small {
71 friend std::ostream& operator<< <__length, __sign> (std::ostream&,
72 const vint_small<__length, __sign>&);
73private:
74 /* selection of integer type (beware: nasty mpl stuff :) */
75typedef
76#ifndef NO_INT64
77 typename if_<
78 bool_<(__length> 32 && __length <= 64)>,
79 typename if_<bool_<__sign>, boost::int64_t, boost::uint64_t>::type,
80#endif
81#ifndef NO_INT32
82 typename if_<
83 bool_<(__length> 16 && __length <= 32)>,
84 typename if_<bool_<__sign>, boost::int32_t, boost::uint32_t>::type,
85#endif
86 typename if_<
87 bool_<(__length> 8 && __length <= 16)>,
88 typename if_<bool_<__sign>, boost::int16_t, boost::uint16_t>::type,
89 typename if_<
90 bool_<(__length> 0 && __length <= 8)>,
91 typename if_<bool_<__sign>, boost::int8_t, boost::uint8_t>::type,
92 void
93> ::type
94#ifndef NO_INT32
95> ::type
96#endif
97#ifndef NO_INT64
98> ::type
99#endif
100> ::type type;
101
102 /* THE actual value */
103 type value;
104
105 /* this method trims an integer if neccessary */
106 finline void trim() {
107 value &= (((type)1) << __length) - 1;
108 }
109
110 /* our internal small int */
111 typedef vint_small<__length,__sign> _self;
112public:
113 finline vint_small() {
114 value = 0;
115 }
116
117 finline vint_small( const type& value ) {
118 this->value = value;
119 trim();
120 }
121
122 finline vint_small(const char* text, int base = 10) {
123 assign(std::string(text),base);
124 }
125
126 //-- conversion -----------------------------------------------------------
127
128 template<class T>
129 finline void convert_to( T& v, if_integral(T) ) const {
130 v = (T)value;
131 }
132
133 finline std::string to_string(int base = 10,
134 int str_size = 0, char str_fill = '0') const {
135
136 // convert to another base
137 std::string s = "\0";
138 int last_non_zero = 0;
139 int last = 0;
140 type _val = value;
141
142 while (_val != 0) {
143 // divide by base
144 type rem = _val % base;
145 type _div = _val / base;
146
147 // set char
148 s += (char) rem;
149 if (rem != 0) last_non_zero = last;
150 last++;
151
152 // divided value as new
153 _val = _div;
154 }
155 last = last_non_zero + 1;
156
157 // reverse
158 for (int i = 0; i < last / 2; i++) {
159 char dummy = s[i];
160 s[i] = s[last - i - 1];
161 s[last - i - 1] = (int) dummy;
162 }
163
164 // convert string
165 s.resize(last);
166 for (int i = 0; i < last; i++)
167 s[i] = ("0123456789ABCDEF")[(int) s[i]];
168
169 // add leading zeros
170 if (last < str_size) {
171 char zeros[str_size - last+1];
172 memset(zeros, str_fill, str_size - last);
173 zeros[str_size - last] = 0;
174 return std::string(zeros) + s;
175 } else {
176 return s;
177 }
178 }
179
180 std::string to_debug_string(int base = 10,
181 int str_size = 0, char str_fill = '0') const {
182 std::ostringstream str;
183 str << "vint_small(static,";
184 str << "length=" << __length << ",";
185 str << "mem=" << sizeof(*this) << ",";
186 str << "val=" << to_string(base, str_size, str_fill) << ")";
187 return str.str();
188 }
189
190 //-- sub integers ---------------------------------------------------------
191
192 finline bool get_bit(size_t index) const {
193 return false;
194 }
195
196 finline void set_bit(size_t index, bool v) {
197 }
198
199 finline void set_subint(_self& v, size_t index) {
200 }
201
202 finline void set_subint(uintmax_t v, size_t index) {
203 }
204
205 finline _self get_subint(size_t index, size_t length) const {
206 }
207
208 finline uintmax_t get_subint(size_t index) const {
209 return 0;
210 }
211
212 //-- assignment -----------------------------------------------------------
213
214 template<typename T>
215 finline void assign(const T& v, if_integral(T) ) {
216 value = v;
217 }
218
219 finline void assign(const std::string& text, int base = 10) {
220 int x;
221 sscanf(text.c_str(), "%d", &x);
222 value = x;
223 }
224
225 //-- compare operations ---------------------------------------------------
226
227 finline int compare_to(const _self& v) const {
228 return (int)(value-v.value);
229 }
230
231 template<class T>
232 finline int compare_to(const T& v, if_integral(T) ) const {
233 return (int)(value-v);
234 }
235
236 //-- integer arithmetic ---------------------------------------------------
237
238 // addition
239 template<class T>
240 finline void add(const T& rhs, if_integral(T) ) {
241 value += rhs; trim();
242 }
243
244 finline void add(const _self& rhs) {
245 value += rhs.value; trim();
246 }
247
248 // subtraction
249 template<class T>
250 finline void sub(const T& rhs, if_integral(T) ) {
251 value -= rhs; trim();
252 }
253
254 finline void sub(const _self& rhs) {
255 value -= rhs.value; trim();
256 }
257
258 // multiplication
259 template<class T>
260 finline void mul(const T& rhs, if_integral(T) ) {
261 value *= rhs; trim();
262 }
263
264 finline void mul(const _self& rhs) {
265 value *= rhs.value; trim();
266 }
267
268 finline void mul(_self& res_l, _self& res_h, _self& rhs) {
269 res_l.value = rhs.value * value;
270 res_h.value = (rhs.value >> __length) * value;
271 }
272
273 // modulo
274 template<class T>
275 finline void mod(const T& rhs, if_integral(T) ) {
276 value %= rhs; trim();
277 }
278
279 finline void mod( const _self& rhs ) {
280 value %= rhs.value; trim();
281 }
282
283 finline void mod( _self& res, const _self& rhs ) {
284 res.value = value % rhs.value; res.trim();
285 }
286
287 // exception to modulo
288 template<class T>
289 finline void mod( T& res, const T& rhs, if_integral(T) ) const {
290 res = value % rhs;
291 }
292
293 // division
294 template<class T>
295 finline void div( const T& rhs, if_integral(T) ) {
296 value /= rhs; trim();
297 }
298
299 finline void div( const _self& rhs ) {
300 value /= rhs.value; trim();
301 }
302
303 finline void div( _self& res, const _self& rhs ) {
304 res.value = value / rhs.value; res.trim();
305 }
306
307 // division with remainder
308 template<class T>
309 finline void divrem(_self& res_div, _self& res_rem, const T& rhs, if_integral(T)) {
310 res_div.value = value / rhs;
311 res_rem.value = value % rhs;
312 }
313
314 finline void divrem(_self& res_rem, const _self& rhs) {
315 value = value / rhs.value;
316 res_rem.value = value % rhs.value;
317 }
318
319 finline void divrem(_self& res_div, _self& res_rem, const _self& rhs) {
320 res_div.value = value / rhs.value;
321 res_rem.value = value % rhs.value;
322 }
323
324 // exception to division with remainder
325 template<class T>
326 finline void divrem(_self& res_div, T& res_rem, const T& rhs, if_integral(T)) {
327 res_div.value = value / rhs;
328 res_rem = value % rhs;
329 }
330
331 // logarithm to the base of 2
332 finline uintmax_t log2() const {
333 return ::log2(value);
334 }
335
336 //-- logical bit operations -----------------------------------------------
337
338 finline void or_ (const _self& rhs) {value |= rhs.value;}
339 finline void and_(const _self& rhs) {value &= rhs.value;}
340 finline void xor_(const _self& rhs) {value ^= rhs.value;}
341 finline void complement() {value = ~value; trim();}
342 finline void lshift(size_t steps) {value <<= steps; trim();}
343 finline void rshift(size_t steps) {value >>= steps; trim();}
344
345 //-- integer dynamic ------------------------------------------------------
346
347 // inline vint<0, __sign> normalized() const { return value.normalized(); }
348
349 //-- general information --------------------------------------------------
350
351 finline size_t length() const {return __length;}
352 finline void set_length(size_t length) {}
353 finline bool is_unspecified() {return false;}
354
355 finline _self max() const {return ~(type)0;}
356 finline _self min() const {return (type)0;}
357 finline _self zero() const {return (type)0;}
358};
359
360}} // namespace _vint::detail
361
362template<size_t l, bool s>
363std::ostream& operator<<(std::ostream& os, const _vint::detail::vint_small<l, s>& v) {
364 return os << v.to_string();
365}
366
367#endif /* VINT_SMALL_HPP_ */
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