* Interface to GiNaC's light-weight expression handles. */
/*
- * GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
+ * GiNaC Copyright (C) 1999-2002 Johannes Gutenberg University Mainz, Germany
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
#ifndef __GINAC_EX_H__
#define __GINAC_EX_H__
+#include <iosfwd>
+#include <functional>
+
#include "basic.h"
-#include "operators.h"
namespace GiNaC {
-// Sorry, this is the only constant to pollute the global scope, the other ones
-// are defined in utils.h and not visible from outside.
-class ex;
-extern const ex & _ex0(void); ///< single ex(numeric(0))
+/** Helper class to initialize the library. There must be one static object
+ * of this class in every object file that makes use of our flyweights in
+ * order to guarantee proper initialization. Hence we put it into this
+ * file which is included by every relevant file anyways. This is modeled
+ * after section 27.4.2.1.6 of the C++ standard, where cout and friends are
+ * set up.
+ *
+ * @see utils.cpp */
+class library_init {
+public:
+ library_init();
+ ~library_init();
+private:
+ static int count;
+};
+/** For construction of flyweights, etc. */
+static library_init library_initializer;
+
+// Current versions of Cint don't link data declared extern within functions.
+// FIXME: Fix Cint and later remove this from here.
+#if defined(G__CINTVERSION)
+extern const class numeric *_num0_p;
+#endif
+
class symbol;
class lst;
class scalar_products;
+
/** Lightweight wrapper for GiNaC's symbolic objects. Basically all it does is
* to hold a pointer to the other objects, manage the reference counting and
* provide methods for manipulation of these objects. (Some people call such
* a thing a proxy class.) */
class ex
{
- friend class basic;
+ friend class archive_node;
+ friend bool are_ex_trivially_equal(const ex &, const ex &);
+ template<class T> friend const T &ex_to(const ex &);
+ template<class T> friend bool is_a(const ex &);
+ template<class T> friend bool is_exactly_a(const ex &);
// member functions
- // default ctor, dtor, copy ctor assignment operator and helpers
+ // default ctor, dtor, copy ctor, assignment operator and helpers
public:
ex();
~ex();
* symbols and other parser errors will throw an exception. */
ex(const std::string &s, const ex &l);
- // functions overriding virtual functions from bases classes
- // none
-
- // new virtual functions which can be overridden by derived classes
- // none
-
// non-virtual functions in this class
public:
- void swap(ex & other);
+ /** Efficiently swap the contents of two expressions. */
+ void swap(ex & other)
+ {
+ GINAC_ASSERT(bp!=0);
+ GINAC_ASSERT(bp->flags & status_flags::dynallocated);
+ GINAC_ASSERT(other.bp!=0);
+ GINAC_ASSERT(other.bp->flags & status_flags::dynallocated);
+
+ basic * tmpbp = bp;
+ bp = other.bp;
+ other.bp = tmpbp;
+ }
+
void print(const print_context & c, unsigned level = 0) const;
void printtree(std::ostream & os) const;
void dbgprint(void) const;
bool info(unsigned inf) const { return bp->info(inf); }
unsigned nops() const { return bp->nops(); }
ex expand(unsigned options=0) const;
- bool has(const ex & other) const { return bp->has(other); }
- ex map(map_func f) const { return bp->map(f); }
+ bool has(const ex & pattern) const { return bp->has(pattern); }
+ ex map(map_function & f) const { return bp->map(f); }
+ ex map(ex (*f)(const ex & e)) const;
+ bool find(const ex & pattern, lst & found) const;
int degree(const ex & s) const { return bp->degree(s); }
int ldegree(const ex & s) const { return bp->ldegree(s); }
ex coeff(const ex & s, int n = 1) const { return bp->coeff(s, n); }
ex primpart(const symbol &x) const;
ex primpart(const symbol &x, const ex &cont) const;
ex normal(int level = 0) const;
- ex to_rational(lst &repl_lst) const;
- ex smod(const numeric &xi) const;
+ ex to_rational(lst &repl_lst) const { return bp->to_rational(repl_lst); }
+ ex smod(const numeric &xi) const { return bp->smod(xi); }
numeric max_coefficient(void) const;
ex collect(const ex & s, bool distributed = false) const { return bp->collect(s, distributed); }
ex eval(int level = 0) const { return bp->eval(level); }
ex rhs(void) const;
int compare(const ex & other) const;
bool is_equal(const ex & other) const;
- bool is_zero(void) const { return is_equal(_ex0()); }
+ bool is_zero(void) const { extern const ex _ex0; return is_equal(_ex0); }
unsigned return_type(void) const { return bp->return_type(); }
unsigned return_type_tinfo(void) const { return bp->return_type_tinfo(); }
// member variables
-public:
+private:
basic *bp; ///< pointer to basic object managed by this
#ifdef OBSCURE_CINT_HACK
+public:
static basic * last_created_or_assigned_bp;
static basic * dummy_bp;
static long last_created_or_assigned_exp;
// performance-critical inlined method implementations
inline
-ex::ex() : bp(_ex0().bp)
+ex::ex()
{
- /*debugmsg("ex default ctor",LOGLEVEL_CONSTRUCT);*/
- GINAC_ASSERT(_ex0().bp!=0);
- GINAC_ASSERT(_ex0().bp->flags & status_flags::dynallocated);
+ extern const class numeric *_num0_p;
+ bp = (basic*)_num0_p;
GINAC_ASSERT(bp!=0);
+ GINAC_ASSERT(bp->flags & status_flags::dynallocated);
++bp->refcount;
#ifdef OBSCURE_CINT_HACK
update_last_created_or_assigned_bp();
inline
ex::~ex()
{
- /*debugmsg("ex dtor",LOGLEVEL_DESTRUCT);*/
GINAC_ASSERT(bp!=0);
GINAC_ASSERT(bp->flags & status_flags::dynallocated);
if (--bp->refcount == 0)
inline
ex::ex(const ex & other) : bp(other.bp)
{
- /*debugmsg("ex copy ctor",LOGLEVEL_CONSTRUCT);*/
GINAC_ASSERT(bp!=0);
GINAC_ASSERT((bp->flags) & status_flags::dynallocated);
++bp->refcount;
inline
ex & ex::operator=(const ex & other)
{
- /*debugmsg("ex operator=",LOGLEVEL_ASSIGNMENT);*/
GINAC_ASSERT(bp!=0);
GINAC_ASSERT(bp->flags & status_flags::dynallocated);
GINAC_ASSERT(other.bp!=0);
inline
ex::ex(const basic & other)
{
- /*debugmsg("ex ctor from basic",LOGLEVEL_CONSTRUCT);*/
construct_from_basic(other);
#ifdef OBSCURE_CINT_HACK
update_last_created_or_assigned_bp();
inline
ex::ex(int i)
{
- /*debugmsg("ex ctor from int",LOGLEVEL_CONSTRUCT);*/
construct_from_int(i);
#ifdef OBSCURE_CINT_HACK
update_last_created_or_assigned_bp();
inline
ex::ex(unsigned int i)
{
- /*debugmsg("ex ctor from unsigned int",LOGLEVEL_CONSTRUCT);*/
construct_from_uint(i);
#ifdef OBSCURE_CINT_HACK
update_last_created_or_assigned_bp();
inline
ex::ex(long i)
{
- /*debugmsg("ex ctor from long",LOGLEVEL_CONSTRUCT);*/
construct_from_long(i);
#ifdef OBSCURE_CINT_HACK
update_last_created_or_assigned_bp();
inline
ex::ex(unsigned long i)
{
- /*debugmsg("ex ctor from unsigned long",LOGLEVEL_CONSTRUCT);*/
construct_from_ulong(i);
#ifdef OBSCURE_CINT_HACK
update_last_created_or_assigned_bp();
inline
ex::ex(double const d)
{
- /*debugmsg("ex ctor from double",LOGLEVEL_CONSTRUCT);*/
construct_from_double(d);
#ifdef OBSCURE_CINT_HACK
update_last_created_or_assigned_bp();
inline
ex::ex(const std::string &s, const ex &l)
{
- /*debugmsg("ex ctor from string,lst",LOGLEVEL_CONSTRUCT);*/
construct_from_string_and_lst(s, l);
#ifdef OBSCURE_CINT_HACK
update_last_created_or_assigned_bp();
// utility functions
+
+/** Compare two objects of class quickly without doing a deep tree traversal.
+ * @return "true" if they are equal
+ * "false" if equality cannot be established quickly (e1 and e2 may
+ * still be equal, in this case. */
inline bool are_ex_trivially_equal(const ex &e1, const ex &e2)
{
return e1.bp == e2.bp;
inline ex expand(const ex & thisex, unsigned options = 0)
{ return thisex.expand(options); }
-inline bool has(const ex & thisex, const ex & other)
-{ return thisex.has(other); }
+inline bool has(const ex & thisex, const ex & pattern)
+{ return thisex.has(pattern); }
+
+inline bool find(const ex & thisex, const ex & pattern, lst & found)
+{ return thisex.find(pattern, found); }
inline int degree(const ex & thisex, const ex & s)
{ return thisex.degree(s); }
inline void swap(ex & e1, ex & e2)
{ e1.swap(e2); }
+// This makes STL algorithms use the more efficient swap operation for ex objects
+inline void iter_swap(std::vector<ex>::iterator i1, std::vector<ex>::iterator i2)
+{ i1->swap(*i2); }
+
+
+/* Function objects for STL sort() etc. */
+struct ex_is_less : public std::binary_function<ex, ex, bool> {
+ bool operator() (const ex &lh, const ex &rh) const { return lh.compare(rh) < 0; }
+};
+
+struct ex_is_equal : public std::binary_function<ex, ex, bool> {
+ bool operator() (const ex &lh, const ex &rh) const { return lh.is_equal(rh); }
+};
+
+struct ex_swap : public std::binary_function<ex, ex, void> {
+ void operator() (ex &lh, ex &rh) const { lh.swap(rh); }
+};
+
+
+/* Convert function pointer to function object suitable for map(). */
+class pointer_to_map_function : public map_function {
+protected:
+ ex (*ptr)(const ex &);
+public:
+ explicit pointer_to_map_function(ex (*x)(const ex &)) : ptr(x) {}
+ ex operator()(const ex & e) { return ptr(e); }
+};
+
+template<class T1>
+class pointer_to_map_function_1arg : public map_function {
+protected:
+ ex (*ptr)(const ex &, T1);
+ T1 arg1;
+public:
+ explicit pointer_to_map_function_1arg(ex (*x)(const ex &, T1), T1 a1) : ptr(x), arg1(a1) {}
+ ex operator()(const ex & e) { return ptr(e, arg1); }
+};
+
+template<class T1, class T2>
+class pointer_to_map_function_2args : public map_function {
+protected:
+ ex (*ptr)(const ex &, T1, T2);
+ T1 arg1;
+ T2 arg2;
+public:
+ explicit pointer_to_map_function_2args(ex (*x)(const ex &, T1, T2), T1 a1, T2 a2) : ptr(x), arg1(a1), arg2(a2) {}
+ ex operator()(const ex & e) { return ptr(e, arg1, arg2); }
+};
+
+template<class T1, class T2, class T3>
+class pointer_to_map_function_3args : public map_function {
+protected:
+ ex (*ptr)(const ex &, T1, T2, T3);
+ T1 arg1;
+ T2 arg2;
+ T3 arg3;
+public:
+ 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) {}
+ ex operator()(const ex & e) { return ptr(e, arg1, arg2, arg3); }
+};
+
+inline ex ex::map(ex (*f)(const ex & e)) const
+{
+ pointer_to_map_function fcn(f);
+ return bp->map(fcn);
+}
+
+
} // namespace GiNaC
#endif // ndef __GINAC_EX_H__