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marked-pointer.hpp
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3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
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7  * Christian Schulte, 2008
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37 
38 #include <cstddef>
39 
40 namespace Gecode { namespace Support {
41 
43  bool marked(void* p);
45  void* mark(void* p);
47  void* unmark(void* p);
49  void* fmark(void* p);
51  void* funmark(void* p);
53  void* ptrsplit(void* p, ptrdiff_t& m);
55  void* ptrjoin(void* p, ptrdiff_t m);
56 
57  forceinline bool
58  marked(void* p) {
59  return (reinterpret_cast<ptrdiff_t>(p) & 1) != 0;
60  }
61  forceinline void*
62  mark(void* p) {
63  assert(!marked(p));
64  return reinterpret_cast<void*>(reinterpret_cast<ptrdiff_t>(p)+1);
65  }
66  forceinline void*
67  unmark(void* p) {
68  assert(marked(p));
69  return reinterpret_cast<void*>(reinterpret_cast<ptrdiff_t>(p)-1);
70  }
71  forceinline void*
72  fmark(void* p) {
73  return reinterpret_cast<void*>(reinterpret_cast<ptrdiff_t>(p)|1);
74  }
75  forceinline void*
76  funmark(void* p) {
77  return reinterpret_cast<void*>(reinterpret_cast<ptrdiff_t>(p)&
78  ~static_cast<ptrdiff_t>(1));
79  }
80  forceinline void*
81  ptrsplit(void* p, ptrdiff_t& m) {
82  ptrdiff_t mp = reinterpret_cast<ptrdiff_t>(p);
83  m = mp & 1;
84  return reinterpret_cast<void*>(mp & ~static_cast<ptrdiff_t>(1));
85  }
86  forceinline void*
87  ptrjoin(void* p, ptrdiff_t m) {
88  return reinterpret_cast<void*>(reinterpret_cast<ptrdiff_t>(p) | m);
89  }
90 
91 }}
92 
93 // STATISTICS: support-any
bool marked(void *p)
Check whether p is marked.
void * mark(void *p)
Return marked pointer for unmarked pointer p.
void * funmark(void *p)
Return unmarked pointer for a possibly marked pointer p.
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:236
void * ptrjoin(void *p, ptrdiff_t m)
Join unmarked pointer p and m into marked pointer.
void * unmark(void *p)
Return unmarked pointer for a marked pointer p.
#define forceinline
Definition: config.hpp:173
void * fmark(void *p)
Return marked pointer for p (possibly already marked)
void * ptrsplit(void *p, ptrdiff_t &m)
Split possibly marked pointer p into mark m and unmarked pointer.
Gecode toplevel namespace