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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Christian Schulte <schulte@gecode.org>
*
* Copyright:
* Christian Schulte, 2017
*
* 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
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#include <functional>
namespace Gecode {
/// Function type for branch filter functions
template<class Var>
using BranchFilter = std::function<bool(const Space& home,
Var x, int i)>;
/// Class storing a branch filter function
template<class View>
class BrancherFilter {
public:
/// The corresponding variable type
typedef typename View::VarType Var;
protected:
SharedData<BranchFilter<Var>> f;
public:
/// Initialize
BrancherFilter(BranchFilter<Var> bf);
/// Initialize during cloning
BrancherFilter(BrancherFilter& bf);
/// Whether filtering is enabled
operator bool(void) const;
/// Invoke filter function
bool operator ()(const Space& home, View x, int i) const;
/// Whether dispose must always be called (that is, notice is needed)
bool notice(void) const;
/// Delete object
void dispose(Space& home);
};
/// Class without a branch filter function
template<class View>
class BrancherNoFilter {
public:
/// The corresponding variable type
typedef typename View::VarType Var;
public:
/// Initialize
BrancherNoFilter(BranchFilter<Var> bf);
/// Initialize during cloning
BrancherNoFilter(BrancherNoFilter& bf);
/// Whether filtering is enabled
operator bool(void) const;
/// Invoke filter function
bool operator ()(const Space& home, View x, int i) const;
/// Whether dispose must always be called (that is, notice is needed)
bool notice(void) const;
/// Delete object
void dispose(Space& home);
};
template<class View>
forceinline
BrancherFilter<View>::BrancherFilter(BranchFilter<Var> bf) : f(bf) {
if (!bf)
throw Gecode::InvalidFunction("BrancherFilter::BrancherFilter");
}
template<class View>
forceinline
BrancherFilter<View>::BrancherFilter(BrancherFilter<View>& bf)
: f(bf.f) {
}
template<class View>
forceinline
BrancherFilter<View>::operator bool(void) const {
return true;
}
template<class View>
forceinline bool
BrancherFilter<View>::operator ()(const Space& home, View x, int i) const {
GECODE_VALID_FUNCTION(f());
Var xv(x.varimp());
return f()(home,xv,i);
}
template<class View>
forceinline bool
BrancherFilter<View>::notice(void) const {
return true;
}
template<class View>
forceinline void
BrancherFilter<View>::dispose(Space&) {
f.~SharedData<BranchFilter<Var>>();
}
template<class View>
forceinline
BrancherNoFilter<View>::BrancherNoFilter(BranchFilter<Var> bf) {
assert(!bf);
(void) bf;
}
template<class View>
forceinline
BrancherNoFilter<View>::BrancherNoFilter(BrancherNoFilter<View>&) {}
template<class View>
forceinline
BrancherNoFilter<View>::operator bool(void) const {
return false;
}
template<class View>
forceinline bool
BrancherNoFilter<View>::operator ()(const Space&, View, int) const {
return true;
}
template<class View>
forceinline bool
BrancherNoFilter<View>::notice(void) const {
return false;
}
template<class View>
forceinline void
BrancherNoFilter<View>::dispose(Space&) {
}
}
// STATISTICS: kernel-branch
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