/* Copyright (c) 1997-2010
   Ewgenij Gawrilow, Michael Joswig (Technische Universitaet Darmstadt, Germany)
   http://www.polymake.de

   This program 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: http://www.gnu.org/licenses/gpl.txt.

   This program 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 General Public License for more details.
--------------------------------------------------------------------------------
   $Project: polymake $$Id: linalg_exceptions.h 9991 2010-12-12 23:36:28Z gawrilow $
*/

#ifndef POLYMAKE_INTERNAL_LINALG_EXCEPTIONS_H
#define POLYMAKE_INTERNAL_LINALG_EXCEPTIONS_H

#include <stdexcept>

namespace pm {

class linalg_error : public std::runtime_error {
public:
   linalg_error(const std::string& what) : std::runtime_error(what) {}
};

class degenerate_matrix : public linalg_error {
public:
   degenerate_matrix() : linalg_error("matrix not invertible") {}
   degenerate_matrix(const std::string& what) : linalg_error(what) {}
};

class infeasible : public linalg_error {
public:
   infeasible() : linalg_error("infeasible linear equations system") {}
   infeasible(const std::string& what) : linalg_error(what) {}
};

} // end namespace pm

namespace polymake {
   using pm::linalg_error;
   using pm::degenerate_matrix;
   using pm::infeasible;
}

#endif // POLYMAKE_INTERNAL_LINALG_EXCEPTIONS_H

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