/usr/include/dolfin/common/ArrayView.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 | // Copyright (C) 2015 Garth N. Wells
//
// 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/>.
#ifndef __DOLFIN_ARRAYVIEW_H
#define __DOLFIN_ARRAYVIEW_H
#include <cstddef>
#include <dolfin/log/log.h>
namespace dolfin
{
/// This class provides a wrapper for a pointer to an array. It
/// never owns the data, and will not be valid if the underlying
/// data goes out-of-scope.
template <typename T> class ArrayView
{
public:
/// Constructor
ArrayView() : _size(0), _x(NULL) {}
/// Construct array from a pointer. Array does not take ownership.
ArrayView(std::size_t N, T* x) : _size(N), _x(x) {}
/// Construct array from a container with the the data() and
/// size() functions
template<typename V>
explicit ArrayView(V& v) : _size(v.size()), _x(v.data()) {}
/// Copy constructor
ArrayView(const ArrayView& x) : _size(x._size), _x(x._x) {}
/// Destructor
~ArrayView() {}
/// Update object to point to new data
void set(std::size_t N, T* x)
{ _size = N; _x = x; }
/// Update object to point to new container
template<typename V>
void set(V& v)
{ _size = v.size(); _x = v.data(); }
/// Return size of array
std::size_t size() const
{ return _size; }
/// Test if array view is empty
bool empty() const
{ return (_size == 0) ? true : false; }
/// Access value of given entry (const version)
const T& operator[] (std::size_t i) const
{ dolfin_assert(i < _size); return _x[i]; }
/// Access value of given entry (non-const version)
T& operator[] (std::size_t i)
{ dolfin_assert(i < _size); return _x[i]; }
/// Pointer to start of array
T* begin()
{ return &_x[0]; }
/// Pointer to start of array (const)
const T* begin() const
{ return &_x[0]; }
/// Pointer to beyond end of array
T* end()
{ return &_x[_size]; }
/// Pointer to beyond end of array (const)
const T* end() const
{ return &_x[_size]; }
/// Return pointer to data (const version)
const T* data() const
{ return _x; }
/// Return pointer to data (non-const version)
T* data()
{ return _x; }
private:
// Length of array
std::size_t _size;
// Array data
T* _x;
};
}
#endif
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