// Copyright (C) by Josh Blum. See LICENSE.txt for licensing information.

#ifndef INCLUDED_GRAS_SBUFFER_IPP
#define INCLUDED_GRAS_SBUFFER_IPP

#include <boost/detail/atomic_count.hpp>

namespace gras
{

struct SBufferImpl
{
    SBufferImpl(const SBufferConfig &config):
        count(0),
        config(config)
    {
        //NOP
    }

    boost::detail::atomic_count count;
    SBufferConfig config;
};


extern GRAS_API void sbuffer_handle_deref(SBufferImpl *impl);

GRAS_FORCE_INLINE void intrusive_ptr_add_ref(SBufferImpl *impl)
{
    ++impl->count;
}

GRAS_FORCE_INLINE void intrusive_ptr_release(SBufferImpl *impl)
{
    if (--impl->count == 0)
    {
        sbuffer_handle_deref(impl);
    }
}

GRAS_FORCE_INLINE SBuffer::SBuffer(void):
    offset(0),
    length(0)
{
    //NOP
}

GRAS_FORCE_INLINE void *SBuffer::get_actual_memory(void) const
{
    return (*this)->config.memory;
}

GRAS_FORCE_INLINE size_t SBuffer::get_actual_length(void) const
{
    return (*this)->config.length;
}

GRAS_FORCE_INLINE void *SBuffer::get(const ptrdiff_t delta_bytes) const
{
    return ((char *)(*this)->config.memory) + this->offset + delta_bytes;
}

GRAS_FORCE_INLINE long SBuffer::get_affinity(void) const
{
    return (*this)->config.affinity;
}

GRAS_FORCE_INLINE size_t SBuffer::get_user_index(void) const
{
    return (*this)->config.user_index;
}

GRAS_FORCE_INLINE bool SBuffer::unique(void) const
{
    return (*this)->count == 1;
}

GRAS_FORCE_INLINE size_t SBuffer::use_count(void) const
{
    return (*this)->count;
}

} //namespace gras

#endif /*INCLUDED_GRAS_SBUFFER_IPP*/