Jip J. Dekker
3e72b0e857
git-subtree-dir: software/gecode_on_record git-subtree-split: 37ed9bda495ea87e63217c19a374b5a93bb0078e
266 lines
8.1 KiB
C++
266 lines
8.1 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, 2009
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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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namespace Gecode {
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/**
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* \brief Wait propagator for single view
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*
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* Requires \code #include <gecode/kernel/wait.hh> \endcode
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* \ingroup FuncKernelProp
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*/
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template<class View>
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class UnaryWait : public Propagator {
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protected:
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/// View to wait for becoming assigned
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View x;
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/// Continuation to execute
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SharedData<std::function<void(Space& home)>> c;
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/// Constructor for creation
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UnaryWait(Home home, View x, std::function<void(Space& home)> c0);
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/// Constructor for cloning \a p
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UnaryWait(Space& home, UnaryWait& p);
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public:
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/// Perform copying during cloning
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virtual Actor* copy(Space& home);
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/// Const function (defined as low unary)
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virtual PropCost cost(const Space& home, const ModEventDelta& med) const;
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/// Schedule function
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virtual void reschedule(Space& home);
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/// Perform propagation
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virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
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/// Post propagator that waits until \a x becomes assigned and then executes \a c
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static ExecStatus post(Home home, View x,
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std::function<void(Space& home)> c);
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/// Delete propagator and return its size
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virtual size_t dispose(Space& home);
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};
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/**
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* \brief Wait propagator for several views
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*
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* Requires \code #include <gecode/kernel/wait.hh> \endcode
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* \ingroup FuncKernelProp
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*/
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template<class View>
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class NaryWait : public Propagator {
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protected:
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/// Views to wait for becoming assigned
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ViewArray<View> x;
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/// Continuation to execute
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SharedData<std::function<void(Space& home)>> c;
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/// Constructor for creation
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NaryWait(Home home, ViewArray<View>& x,
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std::function<void(Space& home)> c0);
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/// Constructor for cloning \a p
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NaryWait(Space& home, NaryWait& p);
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public:
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/// Perform copying during cloning
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virtual Actor* copy(Space& home);
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/// Const function (defined as high unary)
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virtual PropCost cost(const Space& home, const ModEventDelta& med) const;
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/// Schedule function
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virtual void reschedule(Space& home);
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/// Perform propagation
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virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
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/// Post propagator that waits until \a x becomes assigned and then executes \a c
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static ExecStatus post(Home home, ViewArray<View>& x,
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std::function<void(Space& home)> c);
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/// Delete propagator and return its size
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virtual size_t dispose(Space& home);
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};
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/*
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* Wait propagator for single view
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*
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*/
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template<class View>
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forceinline
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UnaryWait<View>::UnaryWait(Home home, View x0,
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std::function<void(Space& home)> c0)
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: Propagator(home), x(x0), c(c0) {
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x.subscribe(home,*this,PC_GEN_ASSIGNED);
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home.notice(*this,AP_DISPOSE);
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}
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template<class View>
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forceinline
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UnaryWait<View>::UnaryWait(Space& home, UnaryWait& p)
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: Propagator(home,p), c(p.c) {
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x.update(home,p.x);
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}
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template<class View>
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Actor*
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UnaryWait<View>::copy(Space& home) {
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return new (home) UnaryWait<View>(home,*this);
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}
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template<class View>
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PropCost
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UnaryWait<View>::cost(const Space&, const ModEventDelta&) const {
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return PropCost::unary(PropCost::LO);
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}
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template<class View>
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void
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UnaryWait<View>::reschedule(Space& home) {
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x.reschedule(home,*this,PC_GEN_ASSIGNED);
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}
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template<class View>
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ExecStatus
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UnaryWait<View>::propagate(Space& home, const ModEventDelta&) {
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assert(x.assigned());
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GECODE_VALID_FUNCTION(c());
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c()(home);
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return home.failed() ? ES_FAILED : home.ES_SUBSUMED(*this);
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}
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template<class View>
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forceinline ExecStatus
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UnaryWait<View>::post(Home home, View x,
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std::function<void(Space& home)> c) {
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if (!c)
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throw InvalidFunction("UnaryWait::post");
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if (x.assigned()) {
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c(home);
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return home.failed() ? ES_FAILED : ES_OK;
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} else {
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(void) new (home) UnaryWait<View>(home,x,c);
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return ES_OK;
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}
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}
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template<class View>
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size_t
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UnaryWait<View>::dispose(Space& home) {
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x.cancel(home,*this,PC_GEN_ASSIGNED);
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home.ignore(*this,AP_DISPOSE);
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c.~SharedData<std::function<void(Space& home)>>();
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(void) Propagator::dispose(home);
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return sizeof(*this);
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}
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/*
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* Wait propagator for several views
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*
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*/
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template<class View>
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forceinline
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NaryWait<View>::NaryWait(Home home, ViewArray<View>& x0,
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std::function<void(Space& home)> c0)
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: Propagator(home), x(x0), c(c0) {
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assert(!x[0].assigned());
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x[0].subscribe(home,*this,PC_GEN_ASSIGNED);
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home.notice(*this,AP_DISPOSE);
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}
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template<class View>
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forceinline
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NaryWait<View>::NaryWait(Space& home, NaryWait& p)
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: Propagator(home,p), c(p.c) {
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x.update(home,p.x);
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}
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template<class View>
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Actor*
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NaryWait<View>::copy(Space& home) {
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assert(!x[0].assigned());
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for (int i=x.size()-1; i>0; i--)
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if (x[i].assigned())
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x.move_lst(i);
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assert(x.size() > 0);
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return new (home) NaryWait<View>(home,*this);
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}
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template<class View>
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PropCost
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NaryWait<View>::cost(const Space&, const ModEventDelta&) const {
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return PropCost::unary(PropCost::HI);
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}
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template<class View>
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void
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NaryWait<View>::reschedule(Space& home) {
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x[0].reschedule(home,*this,PC_GEN_ASSIGNED);
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}
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template<class View>
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ExecStatus
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NaryWait<View>::propagate(Space& home, const ModEventDelta& ) {
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assert(x[0].assigned());
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for (int i=x.size()-1; i>0; i--)
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if (x[i].assigned())
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x.move_lst(i);
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assert(x.size() > 0);
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if (x.size() == 1) {
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x.size(0);
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GECODE_VALID_FUNCTION(c());
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c()(home);
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return home.failed() ? ES_FAILED : home.ES_SUBSUMED(*this);
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} else {
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// Create new subscription
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x.move_lst(0);
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assert(!x[0].assigned());
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x[0].subscribe(home,*this,PC_GEN_ASSIGNED,false);
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return ES_OK;
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}
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}
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template<class View>
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forceinline ExecStatus
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NaryWait<View>::post(Home home, ViewArray<View>& x,
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std::function<void(Space& home)> c) {
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if (!c)
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throw InvalidFunction("NaryWait::post");
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for (int i=x.size(); i--; )
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if (x[i].assigned())
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x.move_lst(i);
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if (x.size() == 0) {
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c(home);
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return home.failed() ? ES_FAILED : ES_OK;
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} else {
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x.unique();
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if (x.size() == 1) {
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return UnaryWait<View>::post(home,x[0],c);
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} else {
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(void) new (home) NaryWait<View>(home,x,c);
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return ES_OK;
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}
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}
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}
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template<class View>
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size_t
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NaryWait<View>::dispose(Space& home) {
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if (x.size() > 0)
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x[0].cancel(home,*this,PC_GEN_ASSIGNED);
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home.ignore(*this,AP_DISPOSE);
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c.~SharedData<std::function<void(Space& home)>>();
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(void) Propagator::dispose(home);
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return sizeof(*this);
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}
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}
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// STATISTICS: kernel-prop
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