/usr/include/Cauchy/Eigen3/Infinity.h is in cauchy-dev 0.9.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (c) 2010 Cyrille Berger <cberger@cberger.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation;
* either version 2, or (at your option) any later version of the License.
*
* 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 General Public License
* along with this library; see the file COPYING.RUNTIME. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
* The file COPYING.RUNTIME.EXCEPTION contains an exception that allow
* to use this file with other open source license
*/
#ifndef _CAUCHY_INFINITY_H_
#define _CAUCHY_INFINITY_H_
#include "NumberTypes.h"
namespace Cauchy {
class Infinity {
public:
operator float ()
{
union {float f; uint32 i;} u;
u.i = 0x7f800000;
return u.f;
}
operator double ()
{
union {double d; uint64 i;} u;
u.i = UINT64_C(0x7ff0000000000000);
return u.d;
}
bool operator==(Infinity )
{
return true;
}
bool operator==(float f )
{
return (float)(*this) == f;
}
bool operator==(double f )
{
return (double)(*this) == f;
}
};
bool operator==(double d, Infinity i)
{
return i == d;
}
Infinity Inf;
}
#endif
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