boundaryflag.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_BOUNDARY_FLAG_HH
#define DUMUX_BOUNDARY_FLAG_HH
 
#include <cstddef>
#include <limits>
 
namespace Dumux {

class BoundarySegmentIndexFlag
{
public:
    using value_type = std::size_t;
 
    BoundarySegmentIndexFlag()
    : flag_(invalidFlag_) {}
 
    template<class Intersection>
        requires requires(const Intersection& i) { i.boundary(); i.boundarySegmentIndex(); }
    BoundarySegmentIndexFlag(const Intersection& i)
    : flag_(invalidFlag_)
    {
        if (i.boundary())
            flag_ = i.boundarySegmentIndex();
    }

    explicit BoundarySegmentIndexFlag(value_type flag)
    : flag_(flag) {}
 
    value_type get() const { return flag_; }
 
    operator bool() const { return flag_ != invalidFlag_; }
 
private:
    static constexpr value_type invalidFlag_ = std::numeric_limits<value_type>::max();
    value_type flag_;
};

template<class Grid>
class BoundaryFlag : public BoundarySegmentIndexFlag
{ using BoundarySegmentIndexFlag::BoundarySegmentIndexFlag; };
 
}  // end namespace Dumux
 
#endif