// Forward declaration of the circular buffer and its adaptor.


// Copyright (c) 2003

// Jan Gaspar, Whitestein Technologies


// Permission to use or copy this software for any purpose is hereby granted 

// without fee, provided the above notices are retained on all copies.

// Permission to modify the code and to distribute modified code is granted,

// provided the above notices are retained, and a notice that the code was

// modified is included with the above copyright notice.


// This material is provided "as is", with absolutely no warranty expressed

// or implied. Any use is at your own risk.


#if !defined(BOOST_CIRCULAR_BUFFER_FWD_HPP)

#define BOOST_CIRCULAR_BUFFER_FWD_HPP


#include <boost/config.hpp>

#include <vector>


namespace boost {

// Definition of the default allocator (needed because of non-standard

// default allocator in some STL implementations e.g. SGI STL).

#if !defined(BOOST_NO_DEPENDENT_TYPES_IN_TEMPLATE_VALUE_PARAMETERS)

    #define BOOST_CB_DEFAULT_ALLOCATOR(T) typename std::vector<T>::allocator_type

#else

    #define BOOST_CB_DEFAULT_ALLOCATOR(T) std::vector<T>::allocator_type

#endif


template <class T, class Alloc = BOOST_CB_DEFAULT_ALLOCATOR(T)>
class circular_buffer;

template <class T, class Alloc = BOOST_CB_DEFAULT_ALLOCATOR(T)>
class circular_buffer_space_optimized;

#undef BOOST_CB_DEFAULT_ALLOCATOR


} // namespace boost


#endif // #if !defined(BOOST_CIRCULAR_BUFFER_FWD_HPP)