Exception.h

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/*
 *  CepGen: a central exclusive processes event generator
 *  Copyright (C) 2013-2022  Laurent Forthomme
 *
 *  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 3 of the License, or
 *  any later version.
 *
 *  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.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef CepGen_Core_Exception_h
#define CepGen_Core_Exception_h
 
#include "CepGen/Utils/Message.h"
 
namespace cepgen {
  class Exception : public LoggedMessage, public std::runtime_error {
  public:
    enum Type {
      undefined = -1,  
      error,           
      fatal            
    };
    explicit Exception(const char* mod,
                       const char* from = "",
                       Type type = Type::undefined,
                       const char* file = "",
                       short lineno = 0) noexcept;
    virtual ~Exception() noexcept override;
 
    friend std::ostream& operator<<(std::ostream&, const Type&);
 
    template <typename T>
    inline friend const Exception& operator<<(const Exception& exc, const T& var) noexcept {
      (const LoggedMessage&)exc << var;
      return exc;
    }
    void dump(std::ostream* os = nullptr) const noexcept override;
 
    const char* what() const noexcept override;
 
  private:
    Type type_{Type::undefined};
    mutable char what_[50]{""};
  };
}  // namespace cepgen
 
#define CG_ERROR(mod) cepgen::Exception(mod, __FUNC__, cepgen::Exception::Type::error, __FILE__, __LINE__)
#define CG_FATAL(mod) cepgen::Exception(mod, __FUNC__, cepgen::Exception::Type::fatal, __FILE__, __LINE__)
#define CG_ASSERT(assertion) \
  if (!(assertion))          \
    throw CG_FATAL("Assertion") << "Assertion '" << #assertion << " failed.";
 
#endif