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/* Box<ITV>::Status class declaration.
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_Box_Status_idefs_hh
#define PPL_Box_Status_idefs_hh 1
#ifndef PPL_IN_Box_CLASS
#error "Do not include Box_Status.idefs.hh directly; use Box.defs.hh instead."
#endif
//! A conjunctive assertion about a Box<ITV> object.
/*! \ingroup PPL_CXX_interface
The assertions supported are:
- <EM>empty up-to-date</EM>: the empty flag is meaningful;
- <EM>empty</EM>: the box is the empty set.
- <EM>universe</EM>: the box is universe \f$n\f$-dimensional vector space
\f$\Rset^n\f$.
Not all the conjunctions of these elementary assertions constitute
a legal Status. In fact:
- <EM>empty up-to-date</EM> and <EM>empty</EM> excludes <EM>universe</EM>.
*/
class Status;
class Status {
public:
//! By default Status is the empty set of assertion.
Status();
//! Ordinary copy constructor.
Status(const Status& y);
//! Copy constructor from a box of different type.
template <typename Other_ITV>
Status(const typename Box<Other_ITV>::Status& y);
//! \name Test, remove or add an individual assertion from the conjunction.
//@{
bool test_empty_up_to_date() const;
void reset_empty_up_to_date();
void set_empty_up_to_date();
bool test_empty() const;
void reset_empty();
void set_empty();
bool test_universe() const;
void reset_universe();
void set_universe();
//@}
//! Checks if all the invariants are satisfied.
bool OK() const;
PPL_OUTPUT_DECLARATIONS
/*! \brief
Loads from \p s an ASCII representation (as produced by
ascii_dump(std::ostream&) const) and sets \p *this accordingly.
Returns <CODE>true</CODE> if successful, <CODE>false</CODE> otherwise.
*/
bool ascii_load(std::istream& s);
private:
//! Status is implemented by means of a finite bitset.
typedef unsigned int flags_t;
//! \name Bit-masks for the individual assertions.
//@{
static const flags_t NONE = 0U;
static const flags_t EMPTY_UP_TO_DATE = 1U << 0;
static const flags_t EMPTY = 1U << 1;
static const flags_t UNIVERSE = 1U << 2;
//@}
//! This holds the current bitset.
flags_t flags;
//! Construct from a bit-mask.
Status(flags_t mask);
//! Check whether <EM>all</EM> bits in \p mask are set.
bool test_all(flags_t mask) const;
//! Check whether <EM>at least one</EM> bit in \p mask is set.
bool test_any(flags_t mask) const;
//! Set the bits in \p mask.
void set(flags_t mask);
//! Reset the bits in \p mask.
void reset(flags_t mask);
};
#endif // !defined(PPL_Box_Status_idefs_hh)
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