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- // Copyright (C) 2009-2012 Lorenzo Caminiti
- // Distributed under the Boost Software License, Version 1.0
- // (see accompanying file LICENSE_1_0.txt or a copy at
- // http://www.boost.org/LICENSE_1_0.txt)
- // Home at http://www.boost.org/libs/local_function
- #ifndef GCC_LAMBDA_HPP_
- #define GCC_LAMBDA_HPP_
- #include <boost/local_function.hpp>
- #include <boost/local_function/detail/preprocessor/void_list.hpp>
- #include <boost/local_function/detail/preprocessor/line_counter.hpp>
- #include <boost/local_function/detail/preprocessor/keyword/return.hpp>
- #include <boost/local_function/detail/preprocessor/keyword/const_bind.hpp>
- #include <boost/local_function/detail/preprocessor/keyword/bind.hpp>
- #include <boost/preprocessor/list/for_each_i.hpp>
- #include <boost/preprocessor/list/fold_left.hpp>
- #include <boost/preprocessor/list/append.hpp>
- #include <boost/preprocessor/list/enum.hpp>
- #include <boost/preprocessor/list/adt.hpp>
- #include <boost/preprocessor/tuple/elem.hpp>
- #include <boost/preprocessor/tuple/eat.hpp>
- #include <boost/preprocessor/control/iif.hpp>
- #include <boost/preprocessor/punctuation/comma_if.hpp>
- #include <boost/preprocessor/facilities/expand.hpp>
- #include <boost/preprocessor/cat.hpp>
- #include <boost/config.hpp>
- // PRIVATE //
- #define GCC_LAMBDA_SPLIT_BIND_(elem, binds, params, results) \
- (BOOST_PP_LIST_APPEND(binds, (elem, BOOST_PP_NIL)), params, results)
- #define GCC_LAMBDA_SPLIT_PARAM_(elem, binds, params, results) \
- (binds, BOOST_PP_LIST_APPEND(params, (elem, BOOST_PP_NIL)), results)
- #define GCC_LAMBDA_SPLIT_RESULT_(elem, binds, params, results) \
- (binds, params, BOOST_PP_LIST_APPEND(results, (elem, BOOT_PP_NIL)))
- #define GCC_LAMBDA_SPLIT_DISPATCH_(d, binds_params_results, elem) \
- BOOST_PP_IIF(BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_IS_RETURN_FRONT(elem), \
- GCC_LAMBDA_SPLIT_RESULT_ \
- , BOOST_PP_IIF(BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_IS_BIND_FRONT(elem), \
- GCC_LAMBDA_SPLIT_BIND_ \
- , BOOST_PP_IIF(BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_IS_CONST_BIND_FRONT( \
- elem), \
- GCC_LAMBDA_SPLIT_BIND_ \
- , /* no result, no bind, and no const bind so it's param */ \
- GCC_LAMBDA_SPLIT_PARAM_ \
- )))(elem, BOOST_PP_TUPLE_ELEM(3, 0, binds_params_results), \
- BOOST_PP_TUPLE_ELEM(3, 1, binds_params_results), \
- BOOST_PP_TUPLE_ELEM(3, 2, binds_params_results))
- #define GCC_LAMBDA_SPLIT_(list) \
- BOOST_PP_LIST_FOLD_LEFT(GCC_LAMBDA_SPLIT_DISPATCH_, \
- (BOOST_PP_NIL, BOOST_PP_NIL, BOOST_PP_NIL), list)
- #define GCC_LAMBDA_REMOVE_CONST_BIND_(r, unused, i, elem) \
- BOOST_PP_COMMA_IF(i) \
- BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_CONST_BIND_REMOVE_FRONT(elem)
- #define GCC_LAMBDA_RESULT_TYPE_(results) \
- BOOST_LOCAL_FUNCTION_DETAIL_PP_KEYWORD_RETURN_REMOVE_FRONT( \
- BOOST_PP_LIST_FIRST(results))
- #ifdef BOOST_NO_CXX11_LAMBDAS
- //[gcc_lambda_macro
- # define GCC_LAMBDA_(binds, params, results) \
- ({ /* open statement expression (GCC extension only) */ \
- BOOST_LOCAL_FUNCTION( \
- BOOST_PP_LIST_ENUM(BOOST_PP_LIST_APPEND(binds, \
- BOOST_PP_LIST_APPEND(params, \
- BOOST_PP_IIF(BOOST_PP_LIST_IS_NIL(results), \
- (return void, BOOST_PP_NIL) /* default for lambdas */ \
- , \
- results \
- )\
- ) \
- )) \
- )
- //]
- #else
- # define GCC_LAMBDA_(binds, params, results) \
- /* ignore const binding because not supported by C++11 lambdas */ \
- [ BOOST_PP_LIST_FOR_EACH_I(GCC_LAMBDA_REMOVE_CONST_BIND_, ~, binds) ] \
- ( BOOST_PP_LIST_ENUM(params) ) \
- BOOST_PP_IIF(BOOST_PP_LIST_IS_NIL(results), \
- BOOST_PP_TUPLE_EAT(1) /* void result type (default) */ \
- , \
- -> GCC_LAMBDA_RESULT_TYPE_ \
- )(results)
- #endif
- #define GCC_LAMBDA_TUPLE_(binds_params_results) \
- GCC_LAMBDA_(BOOST_PP_TUPLE_ELEM(3, 0, binds_params_results), \
- BOOST_PP_TUPLE_ELEM(3, 1, binds_params_results), \
- BOOST_PP_TUPLE_ELEM(3, 2, binds_params_results))
- //[gcc_lambda_end_macro
- #define GCC_LAMBDA_END_(id) \
- BOOST_LOCAL_FUNCTION_NAME(BOOST_PP_CAT(gcc_lambda_, id)) \
- BOOST_PP_CAT(gcc_lambda_, id); \
- }) /* close statement expression (GCC extension only) */
- //]
- // PUBLIC //
- // Same arguments as for local functions but respect to C++11 lambdas:
- // const bind v is =v, bind& v is &v, void if no return specified, no = or &.
- #ifdef BOOST_NO_CXX11_VARIADIC_MACROS
- # define GCC_LAMBDA(void_or_seq) \
- GCC_LAMBDA_TUPLE_(GCC_LAMBDA_SPLIT_( \
- BOOST_LOCAL_FUNCTION_DETAIL_PP_VOID_LIST(void_or_seq)))
- #else
- # define GCC_LAMBDA(...) \
- GCC_LAMBDA_TUPLE_(GCC_LAMBDA_SPLIT_( \
- BOOST_LOCAL_FUNCTION_DETAIL_PP_VOID_LIST(__VA_ARGS__)))
- #endif
- #ifdef BOOST_NO_CXX11_LAMBDAS
- # define GCC_LAMBDA_END \
- GCC_LAMBDA_END_(BOOST_LOCAL_FUNCTION_DETAIL_PP_LINE_COUNTER)
- #else
- # define GCC_LAMBDA_END /* nothing */
- #endif
- #endif // #include guard
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