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/* This file is part of the OpenLB library
*
* Copyright (C) 2017 Adrian Kummerlaender
* E-mail contact: info@openlb.net
* The most recent release of OpenLB can be downloaded at
* <http://www.openlb.net/>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef FUNCTOR_PTR_HH
#define FUNCTOR_PTR_HH
#include "functorPtr.h"
#include "io/ostreamManager.h"
namespace olb {
template<typename F>
FunctorPtr<F>::FunctorPtr(F& f):
_ownF(),
_sharedF(),
_f(&f),
_owning(false)
{ }
template<typename F>
FunctorPtr<F>::FunctorPtr(F* f):
_ownF(),
_sharedF(),
_f(f),
_owning(false)
{ }
template<typename F>
FunctorPtr<F>::FunctorPtr(const std::unique_ptr<F>& f):
FunctorPtr(f.get())
{ }
template<typename F>
FunctorPtr<F>::FunctorPtr(std::unique_ptr<F>&& f):
_ownF(std::move(f)),
_f(_ownF.get()),
_owning(true)
{ }
template<typename F>
FunctorPtr<F>::FunctorPtr(std::shared_ptr<F> f):
_sharedF(std::move(f)),
_f(_sharedF.get()),
_owning(true)
{ }
template<typename F>
FunctorPtr<F>::FunctorPtr():
FunctorPtr(nullptr)
{ }
template<typename F>
typename std::add_lvalue_reference<F>::type FunctorPtr<F>::operator*() const
{
return *_f;
}
template<typename F>
typename std::add_pointer<F>::type FunctorPtr<F>::operator->() const noexcept
{
return _f;
}
template<typename F>
FunctorPtr<F>::operator bool() const
{
return _f != nullptr;
}
template<typename F>
bool FunctorPtr<F>::isOwning() const
{
return _owning;
}
template<typename F>
template<typename G>
auto FunctorPtr<F>::toShared() -> typename std::enable_if< util::has_identity_functor<G>::value, std::shared_ptr<F>>::type
{
if ( _owning && _ownF ) {
// convert unique_ptr to shared_ptr
_sharedF = std::shared_ptr<F>(std::move(_ownF));
_f = _sharedF.get();
return _sharedF;
}
else if ( _sharedF ) {
// either we are owning or toShared was called previously and
// prepared a F::identity_functor_type we can reuse here:
return _sharedF;
}
else {
#ifdef OLB_DEBUG_UNSAFE_FUNCTOR_ARITHMETIC
OstreamManager clerr(std::cerr,"FunctorPtr");
clerr << "WARNING: Non-owning functor wrapped in std::shared_ptr. Lifetime of composed functor is not guaranteed." << std::endl;
#endif
// wrap non-owning pointer in identity functor
_sharedF = std::shared_ptr<F>(new typename F::identity_functor_type(*_f));
return _sharedF;
}
}
template<typename F>
template<typename G>
auto FunctorPtr<F>::toShared() -> typename std::enable_if<!util::has_identity_functor<G>::value, std::shared_ptr<F>>::type
{
if ( _owning && _ownF ) {
// convert unique_ptr to shared_ptr
_sharedF = std::shared_ptr<F>(std::move(_ownF));
_f = _sharedF.get();
return _sharedF;
}
else if ( _sharedF ) {
return _sharedF;
}
else {
OstreamManager clerr(std::cerr,"FunctorPtr");
clerr << "ERROR: No identity functor defined. Required to lift functor reference into std::shared_ptr arithmetic." << std::endl;
std::exit(-1);
}
}
}
#endif
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