#ifndef __GINAC_EX_H__
#define __GINAC_EX_H__
+#include <iosfwd>
+#include <functional>
+
#include "basic.h"
#include "operators.h"
-#include <functional>
-
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;
* 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();
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:
- basic *bp; ///< pointer to basic object managed by this
+ basic *bp; ///< pointer to basic object managed by this, direct manipulation deprecated
#ifdef OBSCURE_CINT_HACK
static basic * last_created_or_assigned_bp;
static basic * dummy_bp;
// 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;
git://www.ginac.de / ginac.git / blobdiff