/usr/include/dolfin/function/Constant.h is in libdolfin-dev 2017.2.0.post0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 | // Copyright (C) 2006-2009 Anders Logg
//
// This file is part of DOLFIN.
//
// DOLFIN 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 3 of the License, or
// (at your option) any later version.
//
// DOLFIN 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 DOLFIN. If not, see <http://www.gnu.org/licenses/>.
//
// Modified by Martin Sandve Alnes, 2008.
// Modified by Garth N. Wells, 2008-2011.
#ifndef __CONSTANT_H
#define __CONSTANT_H
#include <vector>
#include <Eigen/Dense>
#include "Expression.h"
namespace dolfin
{
template<typename T> class Array;
class Mesh;
/// This class represents a constant-valued expression.
class Constant : public Expression
{
public:
/// Create scalar constant
///
/// @param value (double)
/// The scalar to create a Constant object from.
///
/// @code{.cpp}
/// Constant c(1.0);
/// @endcode
explicit Constant(double value);
/// Create vector constant (dim = 2)
///
/// @param value0 (double)
/// The first vector element.
/// @param value1 (double)
/// The second vector element.
///
/// @code{.cpp}
/// Constant B(0.0, 1.0);
/// @endcode
Constant(double value0, double value1);
/// Create vector constant (dim = 3)
///
/// @param value0 (double)
/// The first vector element.
/// @param value1 (double)
/// The second vector element.
/// @param value2 (double)
/// The third vector element.
///
/// @code{.cpp}
/// Constant T(0.0, 1.0, 0.0);
/// @endcode
Constant(double value0, double value1, double value2);
/// Create vector-valued constant
///
/// @param values (std::vector<double>)
/// Values to create a vector-valued constant from.
explicit Constant(std::vector<double> values);
/// Create tensor-valued constant for flattened array of values
///
/// @param value_shape (std::vector<std::size_t>)
/// Shape of tensor.
/// @param values (std::vector<double>)
/// Values to create tensor-valued constant from.
Constant(std::vector<std::size_t> value_shape,
std::vector<double> values);
/// Copy constructor
///
/// @param constant (Constant)
/// Object to be copied.
Constant(const Constant& constant);
/// Destructor
~Constant();
/// Assignment operator
///
/// @param constant (Constant)
/// Another constant.
const Constant& operator= (const Constant& constant);
/// Assignment operator
///
/// @param constant (double)
/// Another constant.
const Constant& operator= (double constant);
/// Cast to double (for scalar constants)
///
/// @return double
/// The scalar value.
operator double() const;
/// Return copy of this Constant's current values
///
/// @return std::vector<double>
/// The vector of scalar values of the constant.
std::vector<double> values() const;
//--- Implementation of Expression interface ---
void eval(Array<double>& values, const Array<double>& x) const override;
void eval(Eigen::Ref<Eigen::VectorXd> values,
Eigen::Ref<const Eigen::VectorXd> x) const override;
virtual std::string str(bool verbose) const override;
private:
// Values of constant function
std::vector<double> _values;
};
}
#endif
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