Chris@16: // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
Chris@16: // (C) Copyright 2003-2007 Jonathan Turkanis
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
Chris@16: 
Chris@16: // See http://www.boost.org/libs/iostreams for documentation.
Chris@16: 
Chris@16: #ifndef BOOST_IOSTREAMS_DETAIL_FORWARD_HPP_INCLUDED
Chris@16: #define BOOST_IOSTREAMS_DETAIL_FORWARD_HPP_INCLUDED   
Chris@16: 
Chris@16: #if defined(_MSC_VER) && (_MSC_VER >= 1020)
Chris@16: # pragma once
Chris@16: #endif                  
Chris@16:  
Chris@16: #include <boost/config.hpp> // BOOST_MSVC, BOOST_NO_SFINAE
Chris@16: #include <boost/detail/workaround.hpp>
Chris@16: #include <boost/iostreams/detail/config/limits.hpp>
Chris@16: #include <boost/iostreams/detail/push_params.hpp>
Chris@16: #include <boost/preprocessor/arithmetic/dec.hpp>
Chris@16: #include <boost/preprocessor/arithmetic/inc.hpp>
Chris@16: #include <boost/preprocessor/punctuation/comma_if.hpp>
Chris@16: #include <boost/preprocessor/repetition/enum_binary_params.hpp>
Chris@16: #include <boost/preprocessor/repetition/enum_params.hpp>
Chris@16: #include <boost/preprocessor/repetition/repeat_from_to.hpp>
Chris@16: #include <boost/preprocessor/tuple/elem.hpp>
Chris@16: #include <boost/type_traits/is_same.hpp>
Chris@16: 
Chris@16: //------Macros for defining forwarding constructors and open overloads--------//
Chris@16:     
Chris@16: //
Chris@16: // Macro: BOOST_IOSTREAMS_FORWARD(class, impl, device, params, args)
Chris@16: // Description: Defines constructors and overloads of 'open' which construct
Chris@16: //      a device using the specified argument list and pass it to the specified
Chris@16: //      helper function
Chris@16: //   class - The class name
Chris@16: //   impl - The helper function
Chris@16: //   device - The device type
Chris@16: //   params - The list of formal parameters trailing the device parameter in
Chris@16: //     the helper function's signature
Chris@16: //   params - The list of arguments passed to the helper function, following the
Chris@16: //     device argument
Chris@16: //
Chris@16: #define BOOST_IOSTREAMS_FORWARD(class, impl, device, params, args) \
Chris@16:     class(const device& t params()) \
Chris@16:     { this->impl(::boost::iostreams::detail::wrap(t) args()); } \
Chris@16:     class(device& t params()) \
Chris@16:     { this->impl(::boost::iostreams::detail::wrap(t) args()); } \
Chris@16:     class(const ::boost::reference_wrapper<device>& ref params()) \
Chris@16:     { this->impl(ref args()); } \
Chris@16:     void open(const device& t params()) \
Chris@16:     { this->impl(::boost::iostreams::detail::wrap(t) args()); } \
Chris@16:     void open(device& t params()) \
Chris@16:     { this->impl(::boost::iostreams::detail::wrap(t) args()); } \
Chris@16:     void open(const ::boost::reference_wrapper<device>& ref params()) \
Chris@16:     { this->impl(ref args()); } \
Chris@16:     BOOST_PP_REPEAT_FROM_TO( \
Chris@16:         1, BOOST_PP_INC(BOOST_IOSTREAMS_MAX_FORWARDING_ARITY), \
Chris@16:         BOOST_IOSTREAMS_FORWARDING_CTOR, (class, impl, device) \
Chris@16:     ) \
Chris@16:     BOOST_PP_REPEAT_FROM_TO( \
Chris@16:         1, BOOST_PP_INC(BOOST_IOSTREAMS_MAX_FORWARDING_ARITY), \
Chris@16:         BOOST_IOSTREAMS_FORWARDING_FN, (class, impl, device) \
Chris@16:     ) \
Chris@16:     /**/
Chris@16: #if !BOOST_WORKAROUND(BOOST_MSVC, < 1300)
Chris@16: # define BOOST_IOSTREAMS_FORWARDING_CTOR_I(z, n, tuple) \
Chris@16:     template< typename U100 BOOST_PP_COMMA_IF(BOOST_PP_DEC(n)) \
Chris@16:               BOOST_PP_ENUM_PARAMS_Z(z, BOOST_PP_DEC(n), typename U) > \
Chris@16:     BOOST_PP_TUPLE_ELEM(3, 0, tuple) \
Chris@16:     ( U100& u100 BOOST_PP_COMMA_IF(BOOST_PP_DEC(n)) \
Chris@16:       BOOST_PP_ENUM_BINARY_PARAMS_Z(z, BOOST_PP_DEC(n), const U, &u) \
Chris@16:       BOOST_IOSTREAMS_DISABLE_IF_SAME(U100, BOOST_PP_TUPLE_ELEM(3, 2, tuple))) \
Chris@16:     { this->BOOST_PP_TUPLE_ELEM(3, 1, tuple) \
Chris@16:       ( BOOST_PP_TUPLE_ELEM(3, 2, tuple) \
Chris@16:         ( u100 BOOST_PP_COMMA_IF(BOOST_PP_DEC(n)) \
Chris@16:           BOOST_PP_ENUM_PARAMS_Z(z, BOOST_PP_DEC(n), u)) ); } \
Chris@16:     /**/
Chris@16: # define BOOST_IOSTREAMS_FORWARDING_FN_I(z, n, tuple) \
Chris@16:     template< typename U100 BOOST_PP_COMMA_IF(BOOST_PP_DEC(n)) \
Chris@16:               BOOST_PP_ENUM_PARAMS_Z(z, BOOST_PP_DEC(n), typename U) > \
Chris@16:     void open \
Chris@16:     ( U100& u100 BOOST_PP_COMMA_IF(BOOST_PP_DEC(n)) \
Chris@16:       BOOST_PP_ENUM_BINARY_PARAMS_Z(z, BOOST_PP_DEC(n), const U, &u) \
Chris@16:       BOOST_IOSTREAMS_DISABLE_IF_SAME(U100, BOOST_PP_TUPLE_ELEM(3, 2, tuple))) \
Chris@16:     { this->BOOST_PP_TUPLE_ELEM(3, 1, tuple) \
Chris@16:       ( u100 BOOST_PP_COMMA_IF(BOOST_PP_DEC(n)) \
Chris@16:         BOOST_PP_ENUM_PARAMS_Z(z, BOOST_PP_DEC(n), u) ); } \
Chris@16:     /**/
Chris@16: #else
Chris@16: # define BOOST_IOSTREAMS_FORWARDING_CTOR_I(z, n, tuple)
Chris@16: # define BOOST_IOSTREAMS_FORWARDING_FN_I(z, n, tuple)
Chris@16: #endif
Chris@16: #define BOOST_IOSTREAMS_FORWARDING_CTOR(z, n, tuple) \
Chris@16:     template<BOOST_PP_ENUM_PARAMS_Z(z, n, typename U)> \
Chris@16:     BOOST_PP_TUPLE_ELEM(3, 0, tuple) \
Chris@16:     (BOOST_PP_ENUM_BINARY_PARAMS_Z(z, n, const U, &u) \
Chris@16:       BOOST_IOSTREAMS_DISABLE_IF_SAME(U0, BOOST_PP_TUPLE_ELEM(3, 2, tuple))) \
Chris@16:     { this->BOOST_PP_TUPLE_ELEM(3, 1, tuple) \
Chris@16:       ( BOOST_PP_TUPLE_ELEM(3, 2, tuple) \
Chris@16:         (BOOST_PP_ENUM_PARAMS_Z(z, n, u)) ); } \
Chris@16:     BOOST_IOSTREAMS_FORWARDING_CTOR_I(z, n, tuple) \
Chris@16:     /**/
Chris@16: #define BOOST_IOSTREAMS_FORWARDING_FN(z, n, tuple) \
Chris@16:     template<BOOST_PP_ENUM_PARAMS_Z(z, n, typename U)> \
Chris@16:     void open(BOOST_PP_ENUM_BINARY_PARAMS_Z(z, n, const U, &u) \
Chris@16:       BOOST_IOSTREAMS_DISABLE_IF_SAME(U0, BOOST_PP_TUPLE_ELEM(3, 2, tuple))) \
Chris@16:     { this->BOOST_PP_TUPLE_ELEM(3, 1, tuple) \
Chris@16:       ( BOOST_PP_TUPLE_ELEM(3, 2, tuple) \
Chris@16:         (BOOST_PP_ENUM_PARAMS_Z(z, n, u)) ); } \
Chris@16:     BOOST_IOSTREAMS_FORWARDING_FN_I(z, n, tuple) \
Chris@16:     /**/
Chris@16: 
Chris@16: // Disable forwarding constructors if first parameter type is the same
Chris@16: // as the device type
Chris@16: #if !defined(BOOST_NO_SFINAE) && \
Chris@16:     !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x592))
Chris@16: # define BOOST_IOSTREAMS_DISABLE_IF_SAME(device, param) \
Chris@16:     , typename boost::disable_if< boost::is_same<device, param> >::type* = 0 \
Chris@16:     /**/
Chris@16: #else 
Chris@16: # define BOOST_IOSTREAMS_DISABLE_IF_SAME(device, param)
Chris@16: #endif
Chris@16: 
Chris@16: #endif // #ifndef BOOST_IOSTREAMS_DETAIL_FORWARD_HPP_INCLUDED