// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com) | |
// (C) Copyright 2003-2007 Jonathan Turkanis | |
// Distributed under the Boost Software License, Version 1.0. (See accompanying | |
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.) | |
// See http://www.boost.org/libs/iostreams for documentation. | |
#ifndef BOOST_IOSTREAMS_OPTIMAL_BUFFER_SIZE_HPP_INCLUDED | |
#define BOOST_IOSTREAMS_OPTIMAL_BUFFER_SIZE_HPP_INCLUDED | |
#if defined(_MSC_VER) && (_MSC_VER >= 1020) | |
# pragma once | |
#endif | |
#include <boost/config.hpp> // DEDUCED_TYPENAME, MSVC. | |
#include <boost/detail/workaround.hpp> | |
#include <boost/iostreams/constants.hpp> // constants. | |
#include <boost/iostreams/detail/dispatch.hpp> | |
#include <boost/iostreams/detail/wrap_unwrap.hpp> | |
#include <boost/iostreams/operations_fwd.hpp> | |
#include <boost/mpl/if.hpp> | |
// Must come last. | |
#include <boost/iostreams/detail/config/disable_warnings.hpp> | |
namespace boost { namespace iostreams { | |
namespace detail { | |
template<typename T> | |
struct optimal_buffer_size_impl; | |
} // End namespace detail. | |
template<typename T> | |
std::streamsize optimal_buffer_size(const T& t) | |
{ | |
typedef detail::optimal_buffer_size_impl<T> impl; | |
return impl::optimal_buffer_size(detail::unwrap(t)); | |
} | |
namespace detail { | |
//------------------Definition of optimal_buffer_size_impl--------------------// | |
template<typename T> | |
struct optimal_buffer_size_impl | |
: mpl::if_< | |
is_custom<T>, | |
operations<T>, | |
optimal_buffer_size_impl< | |
BOOST_DEDUCED_TYPENAME | |
dispatch< | |
T, optimally_buffered_tag, device_tag, filter_tag | |
>::type | |
> | |
>::type | |
{ }; | |
template<> | |
struct optimal_buffer_size_impl<optimally_buffered_tag> { | |
template<typename T> | |
static std::streamsize optimal_buffer_size(const T& t) | |
{ return t.optimal_buffer_size(); } | |
}; | |
template<> | |
struct optimal_buffer_size_impl<device_tag> { | |
template<typename T> | |
static std::streamsize optimal_buffer_size(const T&) | |
{ return default_device_buffer_size; } | |
}; | |
template<> | |
struct optimal_buffer_size_impl<filter_tag> { | |
template<typename T> | |
static std::streamsize optimal_buffer_size(const T&) | |
{ return default_filter_buffer_size; } | |
}; | |
} // End namespace detail. | |
} } // End namespaces iostreams, boost. | |
#include <boost/iostreams/detail/config/enable_warnings.hpp> | |
#endif // #ifndef BOOST_IOSTREAMS_OPTIMAL_BUFFER_SIZE_HPP_INCLUDED |