/usr/include/libmesh/face_quad.h is in libmesh-dev 0.7.1-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// The libMesh Finite Element Library.
// Copyright (C) 2002-2008 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// This library 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
// Lesser General Public License for more details.
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#ifndef __quad_h__
#define __quad_h__
// C++ includes
// Local includes
#include "libmesh_common.h"
#include "face.h"
namespace libMesh
{
// Forward declarations
/**
* The \p QUAD is an element in 2D composed of 4 sides.
* It looks like this:
* \verbatim
*
* -----------
* | |
* | |
* | |
* | |
* | |
* -----------
*
* \endverbatim
*/
// ------------------------------------------------------------
// Quad class definition
class Quad : public Face
{
public:
/**
* Default quadrilateral element, takes number of nodes and
* parent. Derived classes implement 'true' elements.
*/
Quad (const unsigned int nn, Elem* p) :
Face(nn, Quad::n_sides(), p) {}
/**
* Constructor. Explicitly specifies the number of
* nodes and neighbors for which storage will be allocated.
*/
Quad (const unsigned int nn,
const unsigned int ns,
Elem* p) :
Face(nn, ns, p) {}
/**
* @returns 4. All quad-derivatives are guaranteed to have at
* least 4 nodes.
*/
unsigned int n_nodes() const { return 4; }
/**
* @returns 4
*/
unsigned int n_sides() const { return 4; }
/**
* @returns 4. All quadrilaterals have 4 vertices.
*/
unsigned int n_vertices() const { return 4; }
/**
* @returns 4. All quadrilaterals have 4 edges.
*/
unsigned int n_edges() const { return 4; }
/**
* @returns 4
*/
unsigned int n_children() const { return 4; }
/*
* @returns true iff the specified child is on the
* specified side
*/
virtual bool is_child_on_side(const unsigned int c,
const unsigned int s) const;
/**
* @returns an id associated with the \p s side of this element.
* The id is not necessariy unique, but should be close. This is
* particularly useful in the \p MeshBase::find_neighbors() routine.
*/
unsigned int key (const unsigned int s) const;
/**
* @returns a primitive (2-noded) edge for
* edge i.
*/
AutoPtr<Elem> side (const unsigned int i) const;
/**
* Based on the quality metric q specified by the user,
* returns a quantitative assessment of element quality.
*/
Real quality (const ElemQuality q) const;
/**
* Returns the suggested quality bounds for
* the hex based on quality measure q. These are
* the values suggested by the CUBIT User's Manual.
*/
std::pair<Real, Real> qual_bounds (const ElemQuality q) const;
/**
* Matrix that tells which vertices define the location
* of mid-side (or second-order) nodes. Since most
* second-order nodes are identical for \p Quad8 and \p Quad9,
* we keep this matrix here in \p Quad
*/
static const unsigned short int _second_order_adjacent_vertices[4][2];
/**
* Vector that names a child sharing each second order node.
*/
static const unsigned short int _second_order_vertex_child_number[9];
/**
* Vector that names the child vertex index for each second order node.
*/
static const unsigned short int _second_order_vertex_child_index[9];
};
// ------------------------------------------------------------
// Quad class member functions
} // namespace libMesh
#endif
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