noexceptions.h

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/***********************************************************************
 Copyright (c) 2005-2007 by Educational Technology Resources, Inc.
 Others may also hold copyrights on code in this file.  See the
 CREDITS.txt file in the top directory of the distribution for details.

 This file is part of MySQL++.

 MySQL++ 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 2.1 of the License, or
 (at your option) any later version.

 MySQL++ 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 MySQL++; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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***********************************************************************/

#ifndef MYSQLPP_NOEXCEPTIONS_H
#define MYSQLPP_NOEXCEPTIONS_H

#include "common.h"

namespace mysqlpp {

#if !defined(DOXYGEN_IGNORE)
// Make Doxygen ignore this
class MYSQLPP_EXPORT NoExceptions;
#endif


class MYSQLPP_EXPORT OptionalExceptions
{
public:
        OptionalExceptions(bool e = true) :
        exceptions_(e)
        {
        }

        virtual ~OptionalExceptions() { }

        void enable_exceptions() const { exceptions_ = true; }

        void disable_exceptions() const { exceptions_ = false; }

        bool throw_exceptions() const { return exceptions_; }

protected:
        void set_exceptions(bool e) const { exceptions_ = e; }

        friend class NoExceptions;

private:
        mutable bool exceptions_;
};



class MYSQLPP_EXPORT NoExceptions
{
public:
        NoExceptions(const OptionalExceptions& a) :
        assoc_(a),
        exceptions_were_enabled_(a.throw_exceptions())
        {
                assoc_.disable_exceptions();
        }

        ~NoExceptions()
        {
                assoc_.set_exceptions(exceptions_were_enabled_);
        }
        
private:
        const OptionalExceptions& assoc_;
        bool exceptions_were_enabled_;

        // Hidden assignment operator and copy ctor, because we should not
        // be copied.
        NoExceptions(const NoExceptions&);
        NoExceptions& operator=(const NoExceptions&);
};

} // end namespace mysqlpp

#endif // MYSQLPP_NOEXCEPTIONS_H

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