3 * Interface to GiNaC's light-weight expression handles. */
6 * GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #ifndef __GINAC_EX_H__
24 #define __GINAC_EX_H__
27 #include "operators.h"
33 /** Helper class to initialize the library. There must be one static object
34 * of this class in every object file that makes use of our flyweights in
35 * order to guarantee proper initialization. Hence we put it into this
36 * file which is included by every relevant file anyways. This is modeled
37 * after section 27.4.2.1.6 of the C++ standard, where cout and friends are
48 /** For construction of flyweights, etc. */
49 static library_init library_initializer;
51 // Current versions of Cint don't link data declared extern within functions.
52 // FIXME: Fix Cint and later remove this from here.
53 #if defined(G__CINTVERSION)
54 extern const class numeric *_num0_p;
60 class scalar_products;
63 /** Lightweight wrapper for GiNaC's symbolic objects. Basically all it does is
64 * to hold a pointer to the other objects, manage the reference counting and
65 * provide methods for manipulation of these objects. (Some people call such
66 * a thing a proxy class.) */
69 friend class archive_node;
70 friend bool are_ex_trivially_equal(const ex &, const ex &);
71 template<class T> friend const T &ex_to(const ex &);
72 template<class T> friend bool is_a(const ex &);
73 template<class T> friend bool is_exactly_a(const ex &);
77 // default ctor, dtor, copy ctor, assignment operator and helpers
82 ex & operator=(const ex & other);
85 ex(const basic & other);
91 /** Construct ex from string and a list of symbols. The input grammar is
92 * similar to the GiNaC output format. All symbols to be used in the
93 * expression must be specified in a lst in the second argument. Undefined
94 * symbols and other parser errors will throw an exception. */
95 ex(const std::string &s, const ex &l);
97 // non-virtual functions in this class
99 void swap(ex & other);
100 void print(const print_context & c, unsigned level = 0) const;
101 void printtree(std::ostream & os) const;
102 void dbgprint(void) const;
103 void dbgprinttree(void) const;
104 bool info(unsigned inf) const { return bp->info(inf); }
105 unsigned nops() const { return bp->nops(); }
106 ex expand(unsigned options=0) const;
107 bool has(const ex & pattern) const { return bp->has(pattern); }
108 ex map(map_function & f) const { return bp->map(f); }
109 ex map(ex (*f)(const ex & e)) const;
110 bool find(const ex & pattern, lst & found) const;
111 int degree(const ex & s) const { return bp->degree(s); }
112 int ldegree(const ex & s) const { return bp->ldegree(s); }
113 ex coeff(const ex & s, int n = 1) const { return bp->coeff(s, n); }
114 ex lcoeff(const ex & s) const { return coeff(s, degree(s)); }
115 ex tcoeff(const ex & s) const { return coeff(s, ldegree(s)); }
116 ex numer(void) const;
117 ex denom(void) const;
118 ex numer_denom(void) const;
119 ex unit(const symbol &x) const;
120 ex content(const symbol &x) const;
121 numeric integer_content(void) const;
122 ex primpart(const symbol &x) const;
123 ex primpart(const symbol &x, const ex &cont) const;
124 ex normal(int level = 0) const;
125 ex to_rational(lst &repl_lst) const { return bp->to_rational(repl_lst); }
126 ex smod(const numeric &xi) const { return bp->smod(xi); }
127 numeric max_coefficient(void) const;
128 ex collect(const ex & s, bool distributed = false) const { return bp->collect(s, distributed); }
129 ex eval(int level = 0) const { return bp->eval(level); }
130 ex evalf(int level = 0) const { return bp->evalf(level); }
131 ex evalm(void) const { return bp->evalm(); }
132 ex diff(const symbol & s, unsigned nth = 1) const;
133 ex series(const ex & r, int order, unsigned options = 0) const;
134 bool match(const ex & pattern) const;
135 bool match(const ex & pattern, lst & repl_lst) const { return bp->match(pattern, repl_lst); }
136 ex subs(const lst & ls, const lst & lr, bool no_pattern = false) const { return bp->subs(ls, lr, no_pattern); }
137 ex subs(const ex & e, bool no_pattern = false) const { return bp->subs(e, no_pattern); }
138 exvector get_free_indices(void) const { return bp->get_free_indices(); }
139 ex simplify_indexed(void) const;
140 ex simplify_indexed(const scalar_products & sp) const;
141 ex symmetrize(void) const;
142 ex symmetrize(const lst & l) const;
143 ex antisymmetrize(void) const;
144 ex antisymmetrize(const lst & l) const;
145 ex symmetrize_cyclic(void) const;
146 ex symmetrize_cyclic(const lst & l) const;
147 ex simplify_ncmul(const exvector & v) const { return bp->simplify_ncmul(v); }
148 ex operator[](const ex & index) const;
149 ex operator[](int i) const;
150 ex op(int i) const { return bp->op(i); }
154 int compare(const ex & other) const;
155 bool is_equal(const ex & other) const;
156 bool is_zero(void) const { extern const ex _ex0; return is_equal(_ex0); }
158 unsigned return_type(void) const { return bp->return_type(); }
159 unsigned return_type_tinfo(void) const { return bp->return_type_tinfo(); }
160 unsigned gethash(void) const { return bp->gethash(); }
162 void construct_from_basic(const basic & other);
163 void construct_from_int(int i);
164 void construct_from_uint(unsigned int i);
165 void construct_from_long(long i);
166 void construct_from_ulong(unsigned long i);
167 void construct_from_double(double d);
168 void construct_from_string_and_lst(const std::string &s, const ex &l);
169 void makewriteable();
171 #ifdef OBSCURE_CINT_HACK
173 static bool last_created_or_assigned_bp_can_be_converted_to_ex(void)
175 if (last_created_or_assigned_bp==0) return false;
176 if ((last_created_or_assigned_bp->flags &
177 status_flags::dynallocated)==0) return false;
178 if ((last_created_or_assigned_bp->flags &
179 status_flags::evaluated)==0) return false;
183 void update_last_created_or_assigned_bp(void)
185 if (last_created_or_assigned_bp!=0) {
186 if (--last_created_or_assigned_bp->refcount == 0) {
187 delete last_created_or_assigned_bp;
190 last_created_or_assigned_bp = bp;
191 ++last_created_or_assigned_bp->refcount;
192 last_created_or_assigned_exp = (long)(void *)(this);
194 #endif // def OBSCURE_CINT_HACK
199 basic *bp; ///< pointer to basic object managed by this, direct manipulation deprecated
200 #ifdef OBSCURE_CINT_HACK
201 static basic * last_created_or_assigned_bp;
202 static basic * dummy_bp;
203 static long last_created_or_assigned_exp;
204 #endif // def OBSCURE_CINT_HACK
208 // performance-critical inlined method implementations
213 extern const class numeric *_num0_p;
214 bp = (basic*)_num0_p;
216 GINAC_ASSERT(bp->flags & status_flags::dynallocated);
218 #ifdef OBSCURE_CINT_HACK
219 update_last_created_or_assigned_bp();
220 #endif // def OBSCURE_CINT_HACK
227 GINAC_ASSERT(bp->flags & status_flags::dynallocated);
228 if (--bp->refcount == 0)
233 ex::ex(const ex & other) : bp(other.bp)
236 GINAC_ASSERT((bp->flags) & status_flags::dynallocated);
238 #ifdef OBSCURE_CINT_HACK
239 update_last_created_or_assigned_bp();
240 #endif // def OBSCURE_CINT_HACK
244 ex & ex::operator=(const ex & other)
247 GINAC_ASSERT(bp->flags & status_flags::dynallocated);
248 GINAC_ASSERT(other.bp!=0);
249 GINAC_ASSERT(other.bp->flags & status_flags::dynallocated);
250 // NB: must first increment other.bp->refcount, since other might be *this.
251 ++other.bp->refcount;
252 if (--bp->refcount==0)
255 #ifdef OBSCURE_CINT_HACK
256 update_last_created_or_assigned_bp();
257 #endif // def OBSCURE_CINT_HACK
262 ex::ex(const basic & other)
264 construct_from_basic(other);
265 #ifdef OBSCURE_CINT_HACK
266 update_last_created_or_assigned_bp();
267 #endif // def OBSCURE_CINT_HACK
273 construct_from_int(i);
274 #ifdef OBSCURE_CINT_HACK
275 update_last_created_or_assigned_bp();
276 #endif // def OBSCURE_CINT_HACK
280 ex::ex(unsigned int i)
282 construct_from_uint(i);
283 #ifdef OBSCURE_CINT_HACK
284 update_last_created_or_assigned_bp();
285 #endif // def OBSCURE_CINT_HACK
291 construct_from_long(i);
292 #ifdef OBSCURE_CINT_HACK
293 update_last_created_or_assigned_bp();
294 #endif // def OBSCURE_CINT_HACK
298 ex::ex(unsigned long i)
300 construct_from_ulong(i);
301 #ifdef OBSCURE_CINT_HACK
302 update_last_created_or_assigned_bp();
303 #endif // def OBSCURE_CINT_HACK
307 ex::ex(double const d)
309 construct_from_double(d);
310 #ifdef OBSCURE_CINT_HACK
311 update_last_created_or_assigned_bp();
312 #endif // def OBSCURE_CINT_HACK
316 ex::ex(const std::string &s, const ex &l)
318 construct_from_string_and_lst(s, l);
319 #ifdef OBSCURE_CINT_HACK
320 update_last_created_or_assigned_bp();
321 #endif // def OBSCURE_CINT_HACK
325 int ex::compare(const ex & other) const
328 GINAC_ASSERT(other.bp!=0);
329 if (bp==other.bp) // trivial case: both expressions point to same basic
331 return bp->compare(*other.bp);
335 bool ex::is_equal(const ex & other) const
338 GINAC_ASSERT(other.bp!=0);
339 if (bp==other.bp) // trivial case: both expressions point to same basic
341 return bp->is_equal(*other.bp);
346 inline bool are_ex_trivially_equal(const ex &e1, const ex &e2)
348 return e1.bp == e2.bp;
351 // wrapper functions around member functions
352 inline unsigned nops(const ex & thisex)
353 { return thisex.nops(); }
355 inline ex expand(const ex & thisex, unsigned options = 0)
356 { return thisex.expand(options); }
358 inline bool has(const ex & thisex, const ex & pattern)
359 { return thisex.has(pattern); }
361 inline bool find(const ex & thisex, const ex & pattern, lst & found)
362 { return thisex.find(pattern, found); }
364 inline int degree(const ex & thisex, const ex & s)
365 { return thisex.degree(s); }
367 inline int ldegree(const ex & thisex, const ex & s)
368 { return thisex.ldegree(s); }
370 inline ex coeff(const ex & thisex, const ex & s, int n=1)
371 { return thisex.coeff(s, n); }
373 inline ex numer(const ex & thisex)
374 { return thisex.numer(); }
376 inline ex denom(const ex & thisex)
377 { return thisex.denom(); }
379 inline ex numer_denom(const ex & thisex)
380 { return thisex.numer_denom(); }
382 inline ex normal(const ex & thisex, int level=0)
383 { return thisex.normal(level); }
385 inline ex to_rational(const ex & thisex, lst & repl_lst)
386 { return thisex.to_rational(repl_lst); }
388 inline ex collect(const ex & thisex, const ex & s, bool distributed = false)
389 { return thisex.collect(s, distributed); }
391 inline ex eval(const ex & thisex, int level = 0)
392 { return thisex.eval(level); }
394 inline ex evalf(const ex & thisex, int level = 0)
395 { return thisex.evalf(level); }
397 inline ex evalm(const ex & thisex)
398 { return thisex.evalm(); }
400 inline ex diff(const ex & thisex, const symbol & s, unsigned nth = 1)
401 { return thisex.diff(s, nth); }
403 inline ex series(const ex & thisex, const ex & r, int order, unsigned options = 0)
404 { return thisex.series(r, order, options); }
406 inline bool match(const ex & thisex, const ex & pattern, lst & repl_lst)
407 { return thisex.match(pattern, repl_lst); }
409 inline ex subs(const ex & thisex, const ex & e)
410 { return thisex.subs(e); }
412 inline ex subs(const ex & thisex, const lst & ls, const lst & lr)
413 { return thisex.subs(ls, lr); }
415 inline ex simplify_indexed(const ex & thisex)
416 { return thisex.simplify_indexed(); }
418 inline ex simplify_indexed(const ex & thisex, const scalar_products & sp)
419 { return thisex.simplify_indexed(sp); }
421 inline ex symmetrize(const ex & thisex)
422 { return thisex.symmetrize(); }
424 inline ex symmetrize(const ex & thisex, const lst & l)
425 { return thisex.symmetrize(l); }
427 inline ex antisymmetrize(const ex & thisex)
428 { return thisex.antisymmetrize(); }
430 inline ex antisymmetrize(const ex & thisex, const lst & l)
431 { return thisex.antisymmetrize(l); }
433 inline ex symmetrize_cyclic(const ex & thisex)
434 { return thisex.symmetrize_cyclic(); }
436 inline ex symmetrize_cyclic(const ex & thisex, const lst & l)
437 { return thisex.symmetrize_cyclic(l); }
439 inline ex op(const ex & thisex, int i)
440 { return thisex.op(i); }
442 inline ex lhs(const ex & thisex)
443 { return thisex.lhs(); }
445 inline ex rhs(const ex & thisex)
446 { return thisex.rhs(); }
448 inline bool is_zero(const ex & thisex)
449 { return thisex.is_zero(); }
451 inline void swap(ex & e1, ex & e2)
455 /* Function objects for STL sort() etc. */
456 struct ex_is_less : public std::binary_function<ex, ex, bool> {
457 bool operator() (const ex &lh, const ex &rh) const { return lh.compare(rh) < 0; }
460 struct ex_is_equal : public std::binary_function<ex, ex, bool> {
461 bool operator() (const ex &lh, const ex &rh) const { return lh.is_equal(rh); }
464 struct ex_swap : public std::binary_function<ex, ex, void> {
465 void operator() (ex &lh, ex &rh) const { lh.swap(rh); }
469 /* Convert function pointer to function object suitable for map(). */
470 class pointer_to_map_function : public map_function {
472 ex (*ptr)(const ex &);
474 explicit pointer_to_map_function(ex (*x)(const ex &)) : ptr(x) {}
475 ex operator()(const ex & e) { return ptr(e); }
479 class pointer_to_map_function_1arg : public map_function {
481 ex (*ptr)(const ex &, T1);
484 explicit pointer_to_map_function_1arg(ex (*x)(const ex &, T1), T1 a1) : ptr(x), arg1(a1) {}
485 ex operator()(const ex & e) { return ptr(e, arg1); }
488 template<class T1, class T2>
489 class pointer_to_map_function_2args : public map_function {
491 ex (*ptr)(const ex &, T1, T2);
495 explicit pointer_to_map_function_2args(ex (*x)(const ex &, T1, T2), T1 a1, T2 a2) : ptr(x), arg1(a1), arg2(a2) {}
496 ex operator()(const ex & e) { return ptr(e, arg1, arg2); }
499 template<class T1, class T2, class T3>
500 class pointer_to_map_function_3args : public map_function {
502 ex (*ptr)(const ex &, T1, T2, T3);
507 explicit pointer_to_map_function_3args(ex (*x)(const ex &, T1, T2, T3), T1 a1, T2 a2, T3 a3) : ptr(x), arg1(a1), arg2(a2), arg3(a3) {}
508 ex operator()(const ex & e) { return ptr(e, arg1, arg2, arg3); }
511 inline ex ex::map(ex (*f)(const ex & e)) const
513 pointer_to_map_function fcn(f);
520 #endif // ndef __GINAC_EX_H__