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marked-pointer.hpp
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1/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2/*
3 * Main authors:
4 * Christian Schulte <schulte@gecode.org>
5 *
6 * Copyright:
7 * Christian Schulte, 2008
8 *
9 * This file is part of Gecode, the generic constraint
10 * development environment:
11 * http://www.gecode.org
12 *
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33
34#include <cstddef>
35
36namespace 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
int p
Number of positive literals for node type.
void * ptrjoin(void *p, ptrdiff_t m)
Join unmarked pointer p and m into marked pointer.
void * ptrsplit(void *p, ptrdiff_t &m)
Split possibly marked pointer p into mark m and unmarked pointer.
void * unmark(void *p)
Return unmarked pointer for a marked pointer p.
void * fmark(void *p)
Return marked pointer for p (possibly already marked)
void * funmark(void *p)
Return unmarked pointer for a possibly marked pointer p.
void * mark(void *p)
Return marked pointer for unmarked pointer p.
bool marked(void *p)
Check whether p is marked.
Gecode toplevel namespace
#define forceinline
Definition config.hpp:187