#include "config.h"
#include <string>
-#include <stdexcept>
+#include <functional>
+
#include "assertion.h"
namespace GiNaC {
-/** Exception class thrown by classes which provide their own series expansion
- * to signal that ordinary Taylor expansion is safe. */
-class do_taylor {};
-
/** Exception class thrown by functions to signal unimplemented functionality
* so the expression may just be .hold() */
class dunno {};
-/** Exception class thrown when a singularity is encountered. */
-class pole_error : public std::domain_error {
-public:
- explicit pole_error(const std::string& what_arg, int degree);
- int degree(void) const;
-private:
- int deg;
-};
-
// some compilers (e.g. cygwin) define a macro log2, causing confusion
#ifndef log2
unsigned log2(unsigned n);
/** Compare two pointers (just to establish some sort of canonical order).
* @return -1, 0, or 1 */
-inline int compare_pointers(const void * a, const void * b)
+template <class T>
+inline int compare_pointers(const T * a, const T * b)
{
- if (a<b)
+ // '<' is not defined for pointers that don't point to the same array,
+ // but std::less is.
+ if (std::less<const T *>()(a, b))
return -1;
- else if (a>b)
+ else if (std::less<const T *>()(b, a))
return 1;
return 0;
}
-/** Rotate lower 31 bits of unsigned value by one bit to the left
- * (upper bit gets cleared). */
-inline unsigned rotate_left_31(unsigned n)
+/** Rotate bits of unsigned value by one bit to the left. */
+inline unsigned rotate_left(unsigned n)
{
- // clear highest bit and shift 1 bit to the left
- n = (n & 0x7FFFFFFFU) << 1;
-
- // overflow? clear highest bit and set lowest bit
- if (n & 0x80000000U)
- n = (n & 0x7FFFFFFFU) | 0x00000001U;
-
- GINAC_ASSERT(n<0x80000000U);
-
- return n;
+ return (n & 0x80000000U) ? (n << 1 | 0x00000001U) : (n << 1);
}
-/** Golden ratio hash function for the 31 least significant bits. */
+/** Truncated multiplication with golden ratio, for computing hash values. */
inline unsigned golden_ratio_hash(unsigned n)
{
- // This function requires arithmetic with at least 64 significant bits
+ // This function works much better when fast arithmetic with at
+ // least 64 significant bits is available.
#if SIZEOF_LONG >= 8
// So 'long' has 64 bits. Excellent! We prefer it because it might be
// more efficient than 'long long'.
- unsigned long l = n * 0x4f1bbcddL;
- return (l & 0x7fffffffU) ^ (l >> 32);
+ unsigned long l = n * 0x4f1bbcddUL;
+ return (unsigned)l;
#elif SIZEOF_LONG_LONG >= 8
// This requires 'long long' (or an equivalent 64 bit type)---which is,
// unfortunately, not ANSI-C++-compliant.
// (Yet C99 demands it, which is reason for hope.)
- unsigned long long l = n * 0x4f1bbcddL;
- return (l & 0x7fffffffU) ^ (l >> 32);
-#elif SIZEOF_LONG_DOUBLE > 8
- // If 'long double' is bigger than 64 bits, we assume that the mantissa
- // has at least 64 bits. This is not guaranteed but it's a good guess.
- // Unfortunately, it may lead to horribly slow code.
- const static long double golden_ratio = .618033988749894848204586834370;
- long double m = golden_ratio * n;
- return unsigned((m - int(m)) * 0x80000000);
+ unsigned long long l = n * 0x4f1bbcddULL;
+ return (unsigned)l;
#else
-#error "No 64 bit data type. You lose."
+ // Without a type with 64 significant bits do the multiplication manually
+ // by splitting n up into the lower and upper two bytes.
+ const unsigned n0 = (n & 0x0000ffffU);
+ const unsigned n1 = (n & 0xffff0000U) >> 16;
+ return (n0 * 0x0000bcddU) + ((n1 * 0x0000bcddU + n0 * 0x00004f1bU) << 16);
#endif
}
// the library but should not be used outside it since it is
// potentially confusing.
-class numeric;
class ex;
extern const numeric *_num_120_p;
extern const numeric &_num_1_4;
extern const ex _ex_1_4;
extern const numeric *_num0_p;
+extern const basic *_num0_bp;
extern const numeric &_num0;
extern const ex _ex0;
extern const numeric *_num1_4_p;
// Helper macros for class implementations (mostly useful for trivial classes)
-#define DEFAULT_COPY(classname) \
-void classname::copy(const classname & other) \
-{ \
- inherited::copy(other); \
-}
-
-#define DEFAULT_DESTROY(classname) \
-void classname::destroy(bool call_parent) \
-{ \
- if (call_parent) \
- inherited::destroy(call_parent); \
-}
-
-#define DEFAULT_CTORS(classname) \
-classname::classname() : inherited(TINFO_##classname) {} \
-DEFAULT_COPY(classname) \
-DEFAULT_DESTROY(classname)
+#define DEFAULT_CTOR(classname) \
+classname::classname() : inherited(TINFO_##classname) {}
#define DEFAULT_UNARCHIVE(classname) \
-ex classname::unarchive(const archive_node &n, const lst &sym_lst) \
+ex classname::unarchive(const archive_node &n, lst &sym_lst) \
{ \
return (new classname(n, sym_lst))->setflag(status_flags::dynallocated); \
}
#define DEFAULT_ARCHIVING(classname) \
-classname::classname(const archive_node &n, const lst &sym_lst) : inherited(n, sym_lst) {} \
+classname::classname(const archive_node &n, lst &sym_lst) : inherited(n, sym_lst) {} \
DEFAULT_UNARCHIVE(classname) \
void classname::archive(archive_node &n) const \
{ \
}
#define DEFAULT_PRINT(classname, text) \
-void classname::print(const print_context & c, unsigned level) const \
+void classname::do_print(const print_context & c, unsigned level) const \
{ \
- if (is_a<print_tree>(c)) \
- inherited::print(c, level); \
- else \
- c.s << text; \
+ c.s << text; \
}
#define DEFAULT_PRINT_LATEX(classname, text, latex) \
-void classname::print(const print_context & c, unsigned level) const \
+DEFAULT_PRINT(classname, text) \
+void classname::do_print_latex(const print_latex & c, unsigned level) const \
{ \
- if (is_a<print_tree>(c)) \
- inherited::print(c, level); \
- else if (is_a<print_latex>(c)) \
- c.s << latex; \
- else \
- c.s << text; \
+ c.s << latex; \
}
-// Obsolete convenience macros. TO BE PHASED OUT SOON!
-// Use the inlined template functions in basic.h instead. (FIXME: remove them)
-
-#define is_of_type(OBJ,TYPE) \
- (dynamic_cast<const TYPE *>(&OBJ)!=0)
-
-#define is_exactly_of_type(OBJ,TYPE) \
- ((OBJ).tinfo()==GiNaC::TINFO_##TYPE)
-
-#define is_ex_of_type(OBJ,TYPE) \
- (dynamic_cast<const TYPE *>((OBJ).bp)!=0)
-
-#define is_ex_exactly_of_type(OBJ,TYPE) \
- ((*(OBJ).bp).tinfo()==GiNaC::TINFO_##TYPE)
-
} // namespace GiNaC
git://www.ginac.de / ginac.git / blobdiff