ranges-scale.hpp
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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Christian Schulte <schulte@gecode.org>
*
* Copyright:
* Christian Schulte, 2005
*
* This file is part of Gecode, the generic constraint
* development environment:
* http://www.gecode.org
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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#include <cmath>
namespace Gecode { namespace Iter { namespace Ranges {
template<class Val, class UnsVal, class I>
class ScaleUp {
protected:
I i;
int a;
Val cur;
Val end;
public:
ScaleUp(void);
ScaleUp(I& i, int a);
void init(I& i, int a);
bool operator ()(void) const;
void operator ++(void);
Val min(void) const;
Val max(void) const;
UnsVal width(void) const;
};
template<class I>
class ScaleDown : public MinMax {
protected:
I i;
int a;
public:
ScaleDown(void);
ScaleDown(I& i, int a);
void init(I& i, int a);
void operator ++(void);
};
template<class Val, class UnsVal, class I>
forceinline
ScaleUp<Val,UnsVal,I>::ScaleUp(void) {}
template<class Val, class UnsVal, class I>
inline void
ScaleUp<Val,UnsVal,I>::init(I& i0, int a0) {
i = i0; a = a0;
if (i()) {
cur = a * i.min();
end = a * i.max();
} else {
cur = 1;
end = 0;
}
}
template<class Val, class UnsVal, class I>
inline
ScaleUp<Val,UnsVal,I>::ScaleUp(I& i0, int a0) : i(i0), a(a0) {
if (i()) {
cur = a * i.min();
end = a * i.max();
} else {
cur = 1;
end = 0;
}
}
template<class Val, class UnsVal, class I>
forceinline void
ScaleUp<Val,UnsVal,I>::operator ++(void) {
if (a == 1) {
++i;
} else {
cur += a;
if (cur > end) {
++i;
if (i()) {
cur = a * i.min();
end = a * i.max();
}
}
}
}
template<class Val, class UnsVal, class I>
forceinline bool
ScaleUp<Val,UnsVal,I>::operator ()(void) const {
return (a == 1) ? i() : (cur <= end);
}
template<class Val, class UnsVal, class I>
forceinline Val
ScaleUp<Val,UnsVal,I>::min(void) const {
return (a == 1) ? static_cast<Val>(i.min()) : cur;
}
template<class Val, class UnsVal, class I>
forceinline Val
ScaleUp<Val,UnsVal,I>::max(void) const {
return (a == 1) ? static_cast<Val>(i.max()) : cur;
}
template<class Val, class UnsVal, class I>
forceinline UnsVal
ScaleUp<Val,UnsVal,I>::width(void) const {
return (a == 1) ?
static_cast<UnsVal>(i.width()) :
static_cast<UnsVal>(1);
}
template<class I>
forceinline void
ScaleDown<I>::operator ++(void) {
finish();
while ((mi > ma) && i()) {
mi = static_cast<int>(ceil(static_cast<double>(i.min())/a));
ma = static_cast<int>(floor(static_cast<double>(i.max())/a));
++i;
}
while (i()) {
int n_mi = static_cast<int>(ceil(static_cast<double>(i.min())/a));
if (n_mi-ma > 1)
break;
int n_ma = static_cast<int>(floor(static_cast<double>(i.max())/a));
if (n_mi <= n_ma) {
ma = n_ma;
}
++i;
}
}
template<class I>
forceinline
ScaleDown<I>::ScaleDown(void) {}
template<class I>
inline void
ScaleDown<I>::init(I& i0, int a0) {
i = i0; a = a0;
operator ++();
}
template<class I>
inline
ScaleDown<I>::ScaleDown(I& i0, int a0) : i(i0), a(a0) {
i = i0; a = a0;
operator ++();
}
}}}
// STATISTICS: iter-any
Gecode::Iter::Ranges::MinMax::ma
int ma
Maximum of current range.
Definition ranges-minmax.hpp:52
Gecode::Iter::Ranges::MinMax::mi
int mi
Minimum of current range.
Definition ranges-minmax.hpp:50
Gecode::Iter::Ranges::MinMax::MinMax
MinMax(void)
Default constructor.
Definition ranges-minmax.hpp:87
Gecode::Iter::Ranges::MinMax::finish
void finish(void)
Set range such that iteration stops
Definition ranges-minmax.hpp:82
Gecode::Iter::Ranges::ScaleDown::operator++
void operator++(void)
Move iterator to next range (if possible).
Definition ranges-scale.hpp:194
Gecode::Iter::Ranges::ScaleDown::a
int a
Divide by this factor.
Definition ranges-scale.hpp:100
Gecode::Iter::Ranges::ScaleDown::i
I i
Iterator to be scaled down.
Definition ranges-scale.hpp:98
Gecode::Iter::Ranges::ScaleDown::init
void init(I &i, int a)
Initialize with ranges from i and scale factor a.
Definition ranges-scale.hpp:219
Gecode::Iter::Ranges::ScaleDown::ScaleDown
ScaleDown(void)
Default constructor.
Definition ranges-scale.hpp:215
Gecode::Iter::Ranges::ScaleUp::operator++
void operator++(void)
Move iterator to next range (if possible).
Definition ranges-scale.hpp:152
Gecode::Iter::Ranges::ScaleUp::operator()
bool operator()(void) const
Test whether iterator is still at a range or done.
Definition ranges-scale.hpp:168
Gecode::Iter::Ranges::ScaleUp::a
int a
Scale-factor.
Definition ranges-scale.hpp:54
Gecode::Iter::Ranges::ScaleUp::max
Val max(void) const
Return largest value of range.
Definition ranges-scale.hpp:179
Gecode::Iter::Ranges::ScaleUp::ScaleUp
ScaleUp(void)
Default constructor.
Definition ranges-scale.hpp:123
Gecode::Iter::Ranges::ScaleUp::width
UnsVal width(void) const
Return width of range (distance between minimum and maximum).
Definition ranges-scale.hpp:184
Gecode::Iter::Ranges::ScaleUp::end
Val end
Last value of scaled range of i.
Definition ranges-scale.hpp:58
Gecode::Iter::Ranges::ScaleUp::min
Val min(void) const
Return smallest value of range.
Definition ranges-scale.hpp:174
Gecode::Iter::Ranges::ScaleUp::cur
Val cur
Current value of range.
Definition ranges-scale.hpp:56
Gecode::Iter::Ranges::ScaleUp::i
I i
Iterator to be scaled.
Definition ranges-scale.hpp:52
Gecode::Iter::Ranges::ScaleUp::init
void init(I &i, int a)
Initialize with ranges from i and scale factor a.
Definition ranges-scale.hpp:127
Gecode::Val
Gecode::Iter::Ranges
Range iterators.
Definition iter.hh:43
Gecode::Iter
Range and value iterators.
Definition iter.hh:41
Gecode
Gecode toplevel namespace
forceinline
#define forceinline
Definition config.hpp:187