Quelle enumrange.hxx Sprache: C

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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*
* This file incorporates work covered by the following license notice:
*
*   Licensed to the Apache Software Foundation (ASF) under one or more
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*   except in compliance with the License. You may obtain a copy of
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#ifndef INCLUDED_O3TL_ENUMRANGE_HXX
#define INCLUDED_O3TL_ENUMRANGE_HXX

namespace o3tl {

///
/// This is a container convenience class iterating over scoped enumerations.
///
/// This assumes that the 'enum class' definition
///  - starts at zero
///  - has no holes in its sequence of values
///  - defines a value called LAST which refers to the greatest constant.
///
///  Use like this:
///     enum class COLOR { RED, GREEN, BLUE, LAST=BLUE };
///     for( auto e : o3tl::enumrange<Color>() )
///        ....;
///
/// \param T the 'enum class' type.
template< typename T>
class enumrange
{
public:
    class Iterator
    {
    public:
        Iterator( int value ) :
            m_value( value )
        {
        }

        T operator*( void ) const
        {
            return static_cast<T>(m_value);
        }

        void operator++( void )
        {
            ++m_value;
        }

        bool operator!=( Iterator rhs ) const
        {
            return m_value != rhs.m_value;
        }

    private:
        int m_value;
   };
};

template< typename T >
typename enumrange<T>::Iterator begin( enumrange<T> )
{
    return typename enumrange<T>::Iterator( int(0) );
}

template< typename T >
typename enumrange<T>::Iterator end( enumrange<T> )
{
    return typename enumrange<T>::Iterator( static_cast<int>(T::LAST) + 1 );
}

}; // namespace o3tl

#endif /* INCLUDED_O3TL_ENUMRANGE_HXX */

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

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