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|---|---|---|---|
| 1 | // -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- | ||
| 2 | // vi: set et ts=4 sw=4 sts=4: | ||
| 3 | // | ||
| 4 | // SPDX-FileCopyrightText: Copyright © DuMux Project contributors, see AUTHORS.md in root folder | ||
| 5 | // SPDX-License-Identifier: GPL-3.0-or-later | ||
| 6 | // | ||
| 7 | /*! | ||
| 8 | * \file | ||
| 9 | * \ingroup FaceCenteredStaggeredDiscretization | ||
| 10 | * \copydoc Dumux::FaceCenteredStaggeredFVGridGeometry | ||
| 11 | */ | ||
| 12 | #ifndef DUMUX_DISCRETIZATION_FACECENTERED_STAGGERED_NORMAL_AXIS_HH | ||
| 13 | #define DUMUX_DISCRETIZATION_FACECENTERED_STAGGERED_NORMAL_AXIS_HH | ||
| 14 | |||
| 15 | #include <cstddef> | ||
| 16 | #include <algorithm> | ||
| 17 | #include <numeric> | ||
| 18 | |||
| 19 | namespace Dumux { | ||
| 20 | |||
| 21 | /*! | ||
| 22 | * \ingroup FaceCenteredStaggeredDiscretization | ||
| 23 | * \brief Returns the normal axis index of a unit vector (0 = x, 1 = y, 2 = z) | ||
| 24 | */ | ||
| 25 | template<class Vector> | ||
| 26 | 41335702 | inline static std::size_t normalAxis(const Vector& v) | |
| 27 | { | ||
| 28 | using std::abs; | ||
| 29 | |||
| 30 | 41335702 | constexpr auto eps = 1e-8; | |
| 31 |
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103407348 | assert(std::any_of(v.begin(), v.end(), [=](auto x){ return abs(x) > eps; })); |
| 32 | |||
| 33 |
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41335702 | const auto result = std::distance( |
| 34 |
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62071646 | std::begin(v), std::find_if(v.begin(), v.end(), [eps=eps](auto x){ return abs(x) > eps; }) |
| 35 | ); | ||
| 36 | |||
| 37 | // make sure there is only one non-zero entry | ||
| 38 |
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82671404 | assert(v[result] == std::accumulate(v.begin(), v.end(), 0.0)); |
| 39 | |||
| 40 | 41335702 | return result; | |
| 41 | } | ||
| 42 | |||
| 43 | } // end namespace Dumux | ||
| 44 | |||
| 45 | #endif | ||
| 46 |