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/* Implementation of marked pointers for use in some PPL non-templatic
language interfaces.
Copyright (C) 2001-2010 Roberto Bagnara <bagnara@cs.unipr.it>
Copyright (C) 2010-2011 BUGSENG srl (http://bugseng.com)
This file is part of the Parma Polyhedra Library (PPL).
The PPL is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
The PPL is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307, USA.
For the most up-to-date information see the Parma Polyhedra Library
site: http://www.cs.unipr.it/ppl/ . */
#ifndef PPL_marked_pointers_hh
#define PPL_marked_pointers_hh 1
namespace Parma_Polyhedra_Library {
#define PPL_MARKED_POINTERS_MASK ((uintptr_t) 1)
/*! \brief
Returns the marked pointer corresponding to \p p.
The marking consists in setting the least significant bit to 1.
*/
template <typename T>
inline T*
mark(T* p) {
uintptr_t uint_p = reinterpret_cast<uintptr_t>(p);
return reinterpret_cast<T*>(uint_p | (PPL_MARKED_POINTERS_MASK));
}
//! Returns the unmarked pointer corresponding to \p p.
template <typename T>
inline T*
unmark(T* p) {
uintptr_t uint_p = reinterpret_cast<uintptr_t>(p);
return reinterpret_cast<T*>(uint_p & ~(PPL_MARKED_POINTERS_MASK));
}
//! Returns <CODE>true</CODE> if and only if \p p is marked.
template <typename T>
inline bool
marked(T* p) {
uintptr_t uint_p = reinterpret_cast<uintptr_t>(p);
return (uint_p & (PPL_MARKED_POINTERS_MASK)) != 0;
}
#undef PPL_MARKED_POINTERS_MASK
} // namespace Parma_Polyhedra_Library
#endif // !defined(PPL_marked_pointers_hh)
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