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marked-pointer.hpp
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
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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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33 
34 #include <cstddef>
35 
36 namespace Gecode { namespace Support {
37 
39  bool marked(void* p);
41  void* mark(void* p);
43  void* unmark(void* p);
45  void* fmark(void* p);
47  void* funmark(void* p);
49  void* ptrsplit(void* p, ptrdiff_t& m);
51  void* ptrjoin(void* p, ptrdiff_t m);
52 
53  forceinline bool
54  marked(void* p) {
55  return (reinterpret_cast<ptrdiff_t>(p) & 1) != 0;
56  }
57  forceinline void*
58  mark(void* p) {
59  assert(!marked(p));
60  return reinterpret_cast<void*>(reinterpret_cast<ptrdiff_t>(p)+1);
61  }
62  forceinline void*
63  unmark(void* p) {
64  assert(marked(p));
65  return reinterpret_cast<void*>(reinterpret_cast<ptrdiff_t>(p)-1);
66  }
67  forceinline void*
68  fmark(void* p) {
69  return reinterpret_cast<void*>(reinterpret_cast<ptrdiff_t>(p)|1);
70  }
71  forceinline void*
72  funmark(void* p) {
73  return reinterpret_cast<void*>(reinterpret_cast<ptrdiff_t>(p)&
74  ~static_cast<ptrdiff_t>(1));
75  }
76  forceinline void*
77  ptrsplit(void* p, ptrdiff_t& m) {
78  ptrdiff_t mp = reinterpret_cast<ptrdiff_t>(p);
79  m = mp & 1;
80  return reinterpret_cast<void*>(mp & ~static_cast<ptrdiff_t>(1));
81  }
82  forceinline void*
83  ptrjoin(void* p, ptrdiff_t m) {
84  return reinterpret_cast<void*>(reinterpret_cast<ptrdiff_t>(p) | m);
85  }
86 
87 }}
88 
89 // STATISTICS: support-any
void * unmark(void *p)
Return unmarked pointer for a marked pointer p.
void * ptrsplit(void *p, ptrdiff_t &m)
Split possibly marked pointer p into mark m and unmarked pointer.
void * mark(void *p)
Return marked pointer for unmarked pointer p.
void * funmark(void *p)
Return unmarked pointer for a possibly marked pointer p.
void * fmark(void *p)
Return marked pointer for p (possibly already marked)
Gecode toplevel namespace
#define forceinline
Definition: config.hpp:185
void * ptrjoin(void *p, ptrdiff_t m)
Join unmarked pointer p and m into marked pointer.
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:232
bool marked(void *p)
Check whether p is marked.