lazyelementcache.hh

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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:
//
// SPDX-FileCopyrightText: Copyright © DuMux Project contributors, see AUTHORS.md in root folder
// SPDX-License-Identifier: GPL-3.0-or-later
//
#ifndef DUMUX_DISCRETIZATION_CVFE_LAZY_ELEMENT_CACHE_HH
#define DUMUX_DISCRETIZATION_CVFE_LAZY_ELEMENT_CACHE_HH
 
#include <utility>
 
namespace Dumux::Detail::CVFE {

template<class Cache, class Problem, class ElementVariables>
class LazyElementCache
{
    using Update = void(*)(Cache&, const void*, const Problem&, const ElementVariables&);
 
public:
    template<class ElementDiscretization>
    void bind(const ElementDiscretization& elemDisc)
    {
        elemDisc_ = &elemDisc;
        update_ = [](Cache& cache, const void* elemDiscPtr, const Problem& problem, const ElementVariables& elemVars)
        {
            const auto& elemDisc = *static_cast<const ElementDiscretization*>(elemDiscPtr);
            cache.update(problem, elemDisc.element(), elemDisc, elemVars);
        };
        isUpToDate_ = false;
    }

    const Cache& get(const Problem& problem, const ElementVariables& elemVars) const
    {
        if (!isUpToDate_)
        {
            update_(cache_, elemDisc_, problem, elemVars);
            isUpToDate_ = true;
        }
        return cache_;
    }

    Cache& get(const Problem& problem, const ElementVariables& elemVars)
    {
        std::as_const(*this).get(problem, elemVars);
        return cache_;
    }
 
private:
    mutable Cache cache_;
    mutable bool isUpToDate_ = false;
    const void* elemDisc_ = nullptr;
    Update update_ = nullptr;
};
 
} // end namespace Dumux::Detail::CVFE
 
#endif