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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Christian Schulte <schulte@gecode.org>
* Mikael Lagerkvist <lagerkvist@gecode.org>
*
* Copyright:
* Christian Schulte, 2008
* Mikael Lagerkvist, 2008
*
* 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 <gecode/kernel.hh>
namespace Gecode { namespace Kernel {
/// %Brancher for calling a function
class FunctionBranch : public Brancher {
protected:
/// Minimal brancher description storing no information
class Description : public Choice {
public:
/// Initialize description for brancher \a b, number of alternatives \a a.
Description(const Brancher& b, unsigned int a);
/// Archive into \a e
virtual void archive(Archive& e) const;
};
/// Function to call
SharedData<std::function<void(Space& home)>> f;
/// Call function just once
bool done;
/// Construct brancher
FunctionBranch(Home home, std::function<void(Space& home)> f0);
/// Copy constructor
FunctionBranch(Space& home, FunctionBranch& b);
public:
/// Check status of brancher, return true if alternatives left
virtual bool status(const Space& home) const;
/// Return choice
virtual const Choice* choice(Space& home);
/// Return choice
virtual const Choice* choice(const Space& home, Archive& a);
/// Perform commit
virtual ExecStatus commit(Space& home, const Choice& ch, unsigned int a);
/// Print explanation
virtual void print(const Space&, const Choice&, unsigned int,
std::ostream& o) const;
/// Copy brancher
virtual Actor* copy(Space& home);
/// Post brancher
static void post(Home home, std::function<void(Space& home)> f);
/// Dispose brancher
virtual size_t dispose(Space& home);
};
forceinline
FunctionBranch::Description::Description(const Brancher& b, unsigned int a)
: Choice(b,a) {}
void
FunctionBranch::Description::archive(Archive& e) const {
Choice::archive(e);
}
forceinline
FunctionBranch::FunctionBranch(Home home,
std::function<void(Space& home)> f0)
: Brancher(home), f(f0), done(false) {
if (!f())
throw InvalidFunction("FunctionBranch::FunctionBranch");
home.notice(*this,AP_DISPOSE);
}
forceinline
FunctionBranch::FunctionBranch(Space& home, FunctionBranch& b)
: Brancher(home,b), f(b.f), done(b.done) {
}
bool
FunctionBranch::status(const Space&) const {
return !done;
}
const Choice*
FunctionBranch::choice(Space&) {
assert(!done);
return new Description(*this,1);
}
const Choice*
FunctionBranch::choice(const Space&, Archive&) {
return new Description(*this,1);
}
ExecStatus
FunctionBranch::commit(Space& home, const Choice&, unsigned int) {
done = true;
GECODE_VALID_FUNCTION(f());
f()(home);
return home.failed() ? ES_FAILED : ES_OK;
}
void
FunctionBranch::print(const Space&, const Choice&, unsigned int,
std::ostream& o) const {
o << "FunctionBranch()";
}
Actor*
FunctionBranch::copy(Space& home) {
return new (home) FunctionBranch(home,*this);
}
forceinline void
FunctionBranch::post(Home home, std::function<void(Space& home)> f) {
if (!f)
throw InvalidFunction("FunctionBranch::post");
(void) new (home) FunctionBranch(home,f);
}
size_t
FunctionBranch::dispose(Space& home) {
home.ignore(*this,AP_DISPOSE);
f.~SharedData<std::function<void(Space& home)>>();
(void) Brancher::dispose(home);
return sizeof(*this);
}
}}
namespace Gecode {
void
branch(Home home, std::function<void(Space& home)> f) {
Kernel::FunctionBranch::post(home,f);
}
}
// STATISTICS: kernel-branch
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