#include "config.h"
#include "assertion.h"
-#ifndef NO_NAMESPACE_GINAC
namespace GiNaC {
-#endif // ndef NO_NAMESPACE_GINAC
-// This should be obsoleted once <sstream> is widely available.
+// This should be obsoleted once <sstream> is widely deployed.
template<class T>
std::string ToString(const T & t)
{
unsigned log2(unsigned n);
#endif
-int compare_pointers(const void * a, const void * b);
+/** 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)
+{
+ if (a<b)
+ return -1;
+ else if (a>b)
+ return 1;
+ return 0;
+}
/** Rotate lower 31 bits of unsigned value by one bit to the left
- * (upper bits get cleared). */
+ * (upper bit gets cleared). */
inline unsigned rotate_left_31(unsigned n)
{
// clear highest bit and shift 1 bit to the left
- n=(n & 0x7FFFFFFFU) << 1;
-
+ n = (n & 0x7FFFFFFFU) << 1;
+
// overflow? clear highest bit and set lowest bit
- if (n & 0x80000000U) {
- n=(n & 0x7FFFFFFFU) | 0x00000001U;
- }
+ if (n & 0x80000000U)
+ n = (n & 0x7FFFFFFFU) | 0x00000001U;
+
GINAC_ASSERT(n<0x80000000U);
-
+
return n;
}
-/** Golden ratio hash function. */
+/** Golden ratio hash function for the 31 least significant bits. */
inline unsigned golden_ratio_hash(unsigned n)
{
// This function requires arithmetic with at least 64 significant bits
-#if 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.
- const static long double golden_ratio = .618033988749894848204586834370;
- long double m = golden_ratio * n;
- return unsigned((m - int(m)) * 0x80000000);
-#elif SIZEOF_LONG >= 8
- // "long" has 64 bits, so we prefer it because it might be more efficient
- // than "long long"
+#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);
#elif SIZEOF_LONG_LONG >= 8
- // This requires ´long long´ (or an equivalent 64 bit type)---which is,
- // unfortunately, not ANSI-compliant:
- unsigned long long l = n * 0x4f1bbcddLL;
+ // 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);
#else
#error "No 64 bit data type. You lose."
#endif
}
-// modified from stl_algo.h: always do com(*first1,*first2) instead of comp(*first2,*first1)
-template <class InputIterator1, class InputIterator2, class OutputIterator, class Compare>
-OutputIterator mymerge(InputIterator1 first1, InputIterator1 last1,
- InputIterator2 first2, InputIterator2 last2,
- OutputIterator result, Compare comp) {
- while (first1 != last1 && first2 != last2) {
- if (comp(*first1, *first2)) {
- *result = *first1;
- ++first1;
- }
- else {
- *result = *first2;
- ++first2;
- }
- ++result;
- }
- return copy(first2, last2, copy(first1, last1, result));
-}
-
-// like merge(), but three lists with *last2<*first3
-template <class InputIterator1, class InputIterator2, class InputIterator3,
- class OutputIterator, class Compare>
-OutputIterator mymerge3(InputIterator1 first1, InputIterator1 last1,
- InputIterator2 first2, InputIterator2 last2,
- InputIterator3 first3, InputIterator3 last3,
- OutputIterator result, Compare comp) {
- while (first1 != last1 && first2 != last2) {
- if (comp(*first1, *first2)) {
- *result = *first1;
- ++first1;
- }
- else {
- *result = *first2;
- ++first2;
- }
- ++result;
- }
-
- if (first1==last1) {
- // list1 empty, copy rest of list2, then list3
- return copy(first3, last3, copy(first2, last2, result));
- } else {
- // list2 empty, merge rest of list1 with list3
- return mymerge(first1,last1,first3,last3,result,comp);
- }
-}
-
// Compute the sign of a permutation of a vector of things.
template <typename T>
int permutation_sign(std::vector<T> s)
return sigma;
}
+void append_exvector_to_exvector(exvector & dest, const exvector & source);
+
// Collection of `construct on first use' wrappers for safely avoiding
// internal object replication without running into the `static
// initialization order fiasco'. This chest of numbers helps speed up
const numeric & _num120(void); // 120
const ex & _ex120(void);
-#ifndef NO_NAMESPACE_GINAC
+
+// 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) \
+{ \
+ debugmsg(#classname " default constructor", LOGLEVEL_CONSTRUCT); \
+} \
+DEFAULT_COPY(classname) \
+DEFAULT_DESTROY(classname)
+
+#define DEFAULT_UNARCHIVE(classname) \
+ex classname::unarchive(const archive_node &n, const 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) \
+{ \
+ debugmsg(#classname " constructor from archive_node", LOGLEVEL_CONSTRUCT); \
+} \
+DEFAULT_UNARCHIVE(classname) \
+void classname::archive(archive_node &n) const \
+{ \
+ inherited::archive(n); \
+}
+
+#define DEFAULT_COMPARE(classname) \
+int classname::compare_same_type(const basic & other) const \
+{ \
+ /* by default, the objects are always identical */ \
+ return 0; \
+}
+
+#define DEFAULT_PRINT(classname, text) \
+void classname::print(const print_context & c, unsigned level) const \
+{ \
+ debugmsg(#classname " print", LOGLEVEL_PRINT); \
+ if (is_of_type(c, print_tree)) \
+ inherited::print(c, level); \
+ else \
+ c.s << text; \
+}
+
+#define DEFAULT_PRINT_LATEX(classname, text, latex) \
+void classname::print(const print_context & c, unsigned level) const \
+{ \
+ debugmsg(#classname " print", LOGLEVEL_PRINT); \
+ if (is_of_type(c, print_tree)) \
+ inherited::print(c, level); \
+ else if (is_of_type(c, print_latex)) \
+ c.s << latex; \
+ else \
+ c.s << text; \
+}
+
} // namespace GiNaC
-#endif // ndef NO_NAMESPACE_GINAC
#endif // ndef __GINAC_UTILS_H__
git://www.ginac.de / ginac.git / blobdiff