eigen_assert_exception.h

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/* This file is part of the Tomographer project, which is distributed under the
 * terms of the MIT license.
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2016 ETH Zurich, Institute for Theoretical Physics, Philippe Faist
 * Copyright (c) 2017 Caltech, Institute for Quantum Information and Matter, Philippe Faist
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 */

#ifndef TOMOGRAPHER_TOOLS_EIGEN_ASSERT_EXCEPTION_H
#define TOMOGRAPHER_TOOLS_EIGEN_ASSERT_EXCEPTION_H

#include <string>
#include <stdexcept>

namespace Tomographer {
namespace Tools {

class EigenAssertException : public std::exception
{
  std::string _msg;
public:
  EigenAssertException(const std::string& msg, const std::string& file, const std::size_t line)
    : _msg("eigen_assert() failed: `" + msg + "' at " + file + ", line " + std::to_string(line))
  {
  }
  virtual ~EigenAssertException() noexcept {}

  virtual const char * what() const noexcept { return _msg.c_str(); }
};

} // namespace Tools
} // namespace Tomographer



// define some Eigen internal magic (undocumented, hope they don't change this in the
// future) in case there is a eigen_assert() in a destructor (e.g. CommaInitializer)
#define VERIFY_RAISES_ASSERT 1
namespace Eigen {
typedef Tomographer::Tools::EigenAssertException eigen_assert_exception;
}


#define eigen_assert_throw_exception(x)         \
  if (!(x)) {                                                           \
    tomographer_eigen_assert_failure_cleanup();                         \
    throw (::Tomographer::Tools::EigenAssertException(#x, __FILE__, __LINE__)); \
  }

inline void tomographer_eigen_assert_failure_cleanup() { }



#ifdef TOMOGRAPHER_EIGEN_ASSERT_EXCEPTION
// override Eigen's eigen_assert() macro
#undef eigen_assert
#define eigen_assert(x) eigen_assert_throw_exception(x)
#endif


#endif