Jip J. Dekker
1d9faf38de
git-subtree-dir: software/gecode git-subtree-split: 313e87646da4fc2752a70e83df16d993121a8e40
136 lines
3.6 KiB
C++
136 lines
3.6 KiB
C++
/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
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/*
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* Main authors:
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* Christian Schulte <schulte@gecode.org>
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*
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* Copyright:
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* Christian Schulte, 2008
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*
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* This file is part of Gecode, the generic constraint
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* development environment:
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* http://www.gecode.org
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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#include <algorithm>
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namespace Gecode { namespace Iter { namespace Ranges {
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/**
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* \brief Range iterator for positive part of a range iterator
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*
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* If \a strict is true, zero is excluded.
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*
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* \ingroup FuncIterRanges
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*/
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template<class I, bool strict=false>
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class Positive {
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protected:
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/// Input iterator
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I i;
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public:
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/// \name Constructors and initialization
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//@{
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/// Default constructor
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Positive(void);
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/// Initialize with ranges from \a i
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Positive(I& i);
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/// Initialize with ranges from \a i
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void init(I& i);
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//@}
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/// \name Iteration control
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//@{
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/// Test whether iterator is still at a range or done
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bool operator ()(void) const;
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/// Move iterator to next range (if possible)
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void operator ++(void);
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//@}
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/// \name Range access
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//@{
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/// Return smallest value of range
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int min(void) const;
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/// Return largest value of range
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int max(void) const;
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/// Return width of range (distance between minimum and maximum)
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unsigned int width(void) const;
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//@}
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};
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template<class I, bool strict>
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forceinline
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Positive<I,strict>::Positive(void) {}
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template<class I, bool strict>
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forceinline void
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Positive<I,strict>::init(I& i0) {
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i=i0;
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if (strict) {
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while (i() && (i.max() < 0)) ++i;
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} else {
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while (i() && (i.max() <= 0)) ++i;
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}
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}
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template<class I, bool strict>
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forceinline
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Positive<I,strict>::Positive(I& i) {
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init(i);
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}
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template<class I, bool strict>
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forceinline void
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Positive<I,strict>::operator ++(void) {
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++i;
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}
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template<class I, bool strict>
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forceinline bool
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Positive<I,strict>::operator ()(void) const {
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return i();
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}
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template<class I, bool strict>
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forceinline int
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Positive<I,strict>::min(void) const {
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if (strict) {
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return std::max(i.min(),1);
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} else {
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return std::max(i.min(),0);
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}
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}
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template<class I, bool strict>
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forceinline int
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Positive<I,strict>::max(void) const {
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return i.max();
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}
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template<class I, bool strict>
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forceinline unsigned int
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Positive<I,strict>::width(void) const {
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return static_cast<unsigned int>(max()-min()+1);
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}
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}}}
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// STATISTICS: iter-any
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