xtl_bitflags.h

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// Common Text Transformation Library
// Copyright (C) 1997-2006 by Igor Kholodov. 
//
// This library 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.
//
// 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 Lesser General Public
// License along with this library; if not, write to the
// Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//
// mailto:cttl@users.sourceforge.net
// http://sourceforge.net/projects/cttl/

#ifndef _CTTL_XTL_BITFLAGS_H_INCLUDED_
#define _CTTL_XTL_BITFLAGS_H_INCLUDED_

namespace cttl_impl {

struct xtl_bitflags
{
    typedef unsigned int value_type;

    xtl_bitflags( value_type flags_ = 0 ) 
        : bits( flags_ )
    {}

    value_type clear( value_type flags_ )
    {
        value_type old_value = bits;
        bits &= ~flags_;
        return old_value;
    }

    value_type set( value_type flags_ )
    {
        value_type old_value = bits;
        bits |= flags_;
        return old_value;
    }

    value_type test( value_type flags_ ) const
    {
        return bits & flags_;
    }

    bool exact_test( value_type flags_ ) const
    {
        return ( bits & flags_ ) == flags_;
    }

    operator value_type() const
    {
        return bits;
    }

    value_type bits;

};  // struct xtl_bitflags

}   // namespace cttl_impl

#endif //_CTTL_XTL_BITFLAGS_H_INCLUDED_

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