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ConditionalStorage.hpp
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// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
// vi: set et ts=4 sw=4 sts=4:
/*
This file is part of the Open Porous Media project (OPM).
OPM 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.
OPM 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 OPM. If not, see <http://www.gnu.org/licenses/>.
Consult the COPYING file in the top-level source directory of this
module for the precise wording of the license and the list of
copyright holders.
*/
#ifndef OPM_CONDITIONAL_STORAGE_HH
#define OPM_CONDITIONAL_STORAGE_HH
#include <stdexcept>
#include <type_traits>
#include <utility>
namespace Opm {
template <bool cond, class T>
class ConditionalStorage
{
public:
typedef T type;
static constexpr bool condition = cond;
ConditionalStorage()
{}
explicit ConditionalStorage(const T& v)
: data_(v)
{}
ConditionalStorage(T&& v)
: data_(std::move(v))
{}
template <class ...Args>
ConditionalStorage(Args... args)
: data_(args...)
{}
ConditionalStorage(const ConditionalStorage& t)
: data_(t.data_)
{};
ConditionalStorage(ConditionalStorage&& t)
: data_(std::move(t.data_))
{};
ConditionalStorage& operator=(const ConditionalStorage& v)
{
data_ = v.data_;
return *this;
}
ConditionalStorage& operator=(ConditionalStorage&& v)
{
data_ = std::move(v.data_);
return *this;
}
const T& operator*() const
{ return data_; }
T& operator*()
{ return data_; }
const T* operator->() const
{ return &data_; }
T* operator->()
{ return &data_; }
private:
T data_{};
};
template <class T>
class ConditionalStorage<false, T>
{
public:
typedef T type;
static constexpr bool condition = false;
ConditionalStorage()
{
static_assert(std::is_default_constructible_v<T>);
}
ConditionalStorage(const T&)
{
static_assert(std::is_copy_constructible_v<T>);
}
ConditionalStorage(const ConditionalStorage &)
{
// copying an empty conditional storage object does not do anything.
};
template <class ...Args>
ConditionalStorage(Args...)
{
static_assert(std::is_constructible_v<T, Args...>);
}
ConditionalStorage& operator=(const ConditionalStorage&)
{
static_assert(std::is_copy_assignable_v<T>);
return *this;
}
const T& operator*() const
{ throw std::logic_error("data member deactivated"); }
T& operator*()
{ throw std::logic_error("data member deactivated"); }
const T* operator->() const
{ throw std::logic_error("data member deactivated"); }
T* operator->()
{ throw std::logic_error("data member deactivated"); }
};
} // namespace Opm
#endif
Opm::ConditionalStorage
A simple class which only stores a given member attribute if a boolean condition is true.
Definition ConditionalStorage.hpp:47
Opm
This class implements a small container which holds the transmissibility mulitpliers for all the face...
Definition Exceptions.hpp:30