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129 | .\" ======================================================================== | |
130 | .\" | |
131 | .IX Title "Math::BigInt::Calc 3" | |
132 | .TH Math::BigInt::Calc 3 "2002-06-01" "perl v5.8.0" "Perl Programmers Reference Guide" | |
133 | .SH "NAME" | |
134 | Math::BigInt::Calc \- Pure Perl module to support Math::BigInt | |
135 | .SH "SYNOPSIS" | |
136 | .IX Header "SYNOPSIS" | |
137 | Provides support for big integer calculations. Not intended to be used by other | |
138 | modules (except Math::BigInt::Cached). Other modules which sport the same | |
139 | functions can also be used to support Math::Bigint, like Math::BigInt::Pari. | |
140 | .SH "DESCRIPTION" | |
141 | .IX Header "DESCRIPTION" | |
142 | In order to allow for multiple big integer libraries, Math::BigInt was | |
143 | rewritten to use library modules for core math routines. Any module which | |
144 | follows the same \s-1API\s0 as this can be used instead by using the following: | |
145 | .PP | |
146 | .Vb 1 | |
147 | \& use Math::BigInt lib => 'libname'; | |
148 | .Ve | |
149 | .PP | |
150 | \&'libname' is either the long name ('Math::BigInt::Pari'), or only the short | |
151 | version like 'Pari'. | |
152 | .SH "EXPORT" | |
153 | .IX Header "EXPORT" | |
154 | The following functions \s-1MUST\s0 be defined in order to support the use by | |
155 | Math::BigInt: | |
156 | .PP | |
157 | .Vb 3 | |
158 | \& _new(string) return ref to new object from ref to decimal string | |
159 | \& _zero() return a new object with value 0 | |
160 | \& _one() return a new object with value 1 | |
161 | .Ve | |
162 | .PP | |
163 | .Vb 5 | |
164 | \& _str(obj) return ref to a string representing the object | |
165 | \& _num(obj) returns a Perl integer/floating point number | |
166 | \& NOTE: because of Perl numeric notation defaults, | |
167 | \& the _num'ified obj may lose accuracy due to | |
168 | \& machine-dependend floating point size limitations | |
169 | .Ve | |
170 | .PP | |
171 | .Vb 13 | |
172 | \& _add(obj,obj) Simple addition of two objects | |
173 | \& _mul(obj,obj) Multiplication of two objects | |
174 | \& _div(obj,obj) Division of the 1st object by the 2nd | |
175 | \& In list context, returns (result,remainder). | |
176 | \& NOTE: this is integer math, so no | |
177 | \& fractional part will be returned. | |
178 | \& _sub(obj,obj) Simple subtraction of 1 object from another | |
179 | \& a third, optional parameter indicates that the params | |
180 | \& are swapped. In this case, the first param needs to | |
181 | \& be preserved, while you can destroy the second. | |
182 | \& sub (x,y,1) => return x - y and keep x intact! | |
183 | \& _dec(obj) decrement object by one (input is garant. to be > 0) | |
184 | \& _inc(obj) increment object by one | |
185 | .Ve | |
186 | .PP | |
187 | .Vb 1 | |
188 | \& _acmp(obj,obj) <=> operator for objects (return -1, 0 or 1) | |
189 | .Ve | |
190 | .PP | |
191 | .Vb 2 | |
192 | \& _len(obj) returns count of the decimal digits of the object | |
193 | \& _digit(obj,n) returns the n'th decimal digit of object | |
194 | .Ve | |
195 | .PP | |
196 | .Vb 4 | |
197 | \& _is_one(obj) return true if argument is +1 | |
198 | \& _is_zero(obj) return true if argument is 0 | |
199 | \& _is_even(obj) return true if argument is even (0,2,4,6..) | |
200 | \& _is_odd(obj) return true if argument is odd (1,3,5,7..) | |
201 | .Ve | |
202 | .PP | |
203 | .Vb 1 | |
204 | \& _copy return a ref to a true copy of the object | |
205 | .Ve | |
206 | .PP | |
207 | .Vb 2 | |
208 | \& _check(obj) check whether internal representation is still intact | |
209 | \& return 0 for ok, otherwise error message as string | |
210 | .Ve | |
211 | .PP | |
212 | The following functions are optional, and can be defined if the underlying lib | |
213 | has a fast way to do them. If undefined, Math::BigInt will use pure Perl (hence | |
214 | slow) fallback routines to emulate these: | |
215 | .PP | |
216 | .Vb 2 | |
217 | \& _from_hex(str) return ref to new object from ref to hexadecimal string | |
218 | \& _from_bin(str) return ref to new object from ref to binary string | |
219 | .Ve | |
220 | .PP | |
221 | .Vb 6 | |
222 | \& _as_hex(str) return ref to scalar string containing the value as | |
223 | \& unsigned hex string, with the '0x' prepended. | |
224 | \& Leading zeros must be stripped. | |
225 | \& _as_bin(str) Like as_hex, only as binary string containing only | |
226 | \& zeros and ones. Leading zeros must be stripped and a | |
227 | \& '0b' must be prepended. | |
228 | .Ve | |
229 | .PP | |
230 | .Vb 4 | |
231 | \& _rsft(obj,N,B) shift object in base B by N 'digits' right | |
232 | \& For unsupported bases B, return undef to signal failure | |
233 | \& _lsft(obj,N,B) shift object in base B by N 'digits' left | |
234 | \& For unsupported bases B, return undef to signal failure | |
235 | .Ve | |
236 | .PP | |
237 | .Vb 4 | |
238 | \& _xor(obj1,obj2) XOR (bit-wise) object 1 with object 2 | |
239 | \& Note: XOR, AND and OR pad with zeros if size mismatches | |
240 | \& _and(obj1,obj2) AND (bit-wise) object 1 with object 2 | |
241 | \& _or(obj1,obj2) OR (bit-wise) object 1 with object 2 | |
242 | .Ve | |
243 | .PP | |
244 | .Vb 5 | |
245 | \& _mod(obj,obj) Return remainder of div of the 1st by the 2nd object | |
246 | \& _sqrt(obj) return the square root of object (truncate to int) | |
247 | \& _fac(obj) return factorial of object 1 (1*2*3*4..) | |
248 | \& _pow(obj,obj) return object 1 to the power of object 2 | |
249 | \& _gcd(obj,obj) return Greatest Common Divisor of two objects | |
250 | .Ve | |
251 | .PP | |
252 | .Vb 3 | |
253 | \& _zeros(obj) return number of trailing decimal zeros | |
254 | \& _modinv return inverse modulus | |
255 | \& _modpow return modulus of power ($x ** $y) % $z | |
256 | .Ve | |
257 | .PP | |
258 | Input strings come in as unsigned but with prefix (i.e. as '123', '0xabc' | |
259 | or '0b1101'). | |
260 | .PP | |
261 | Testing of input parameter validity is done by the caller, so you need not | |
262 | worry about underflow (f.i. in \f(CW\*(C`_sub()\*(C'\fR, \f(CW\*(C`_dec()\*(C'\fR) nor about division by | |
263 | zero or similar cases. | |
264 | .PP | |
265 | The first parameter can be modified, that includes the possibility that you | |
266 | return a reference to a completely different object instead. Although keeping | |
267 | the reference and just changing it's contents is prefered over creating and | |
268 | returning a different reference. | |
269 | .PP | |
270 | Return values are always references to objects or strings. Exceptions are | |
271 | \&\f(CW\*(C`_lsft()\*(C'\fR and \f(CW\*(C`_rsft()\*(C'\fR, which return undef if they can not shift the | |
272 | argument. This is used to delegate shifting of bases different than the one | |
273 | you can support back to Math::BigInt, which will use some generic code to | |
274 | calculate the result. | |
275 | .SH "WRAP YOUR OWN" | |
276 | .IX Header "WRAP YOUR OWN" | |
277 | If you want to port your own favourite c\-lib for big numbers to the | |
278 | Math::BigInt interface, you can take any of the already existing modules as | |
279 | a rough guideline. You should really wrap up the latest BigInt and BigFloat | |
280 | testsuites with your module, and replace in them any of the following: | |
281 | .PP | |
282 | .Vb 1 | |
283 | \& use Math::BigInt; | |
284 | .Ve | |
285 | .PP | |
286 | by this: | |
287 | .PP | |
288 | .Vb 1 | |
289 | \& use Math::BigInt lib => 'yourlib'; | |
290 | .Ve | |
291 | .PP | |
292 | This way you ensure that your library really works 100% within Math::BigInt. | |
293 | .SH "LICENSE" | |
294 | .IX Header "LICENSE" | |
295 | This program is free software; you may redistribute it and/or modify it under | |
296 | the same terms as Perl itself. | |
297 | .SH "AUTHORS" | |
298 | .IX Header "AUTHORS" | |
299 | Original math code by Mark Biggar, rewritten by Tels <http://bloodgate.com/> | |
300 | in late 2000, 2001. | |
301 | Seperated from BigInt and shaped \s-1API\s0 with the help of John Peacock. | |
302 | .SH "SEE ALSO" | |
303 | .IX Header "SEE ALSO" | |
304 | Math::BigInt, Math::BigFloat, Math::BigInt::BitVect, | |
305 | Math::BigInt::GMP, Math::BigInt::Cached and Math::BigInt::Pari. |