boost/local_function/aux_/macro/code_/bind.hpp
// 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 BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_HPP_ #define BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_HPP_ #include <boost/local_function/aux_/symbol.hpp> #include <boost/local_function/aux_/macro/decl.hpp> #include <boost/local_function/aux_/preprocessor/traits/bind.hpp> #include <boost/local_function/aux_/preprocessor/traits/decl_binds.hpp> #include <boost/local_function/aux_/preprocessor/traits/decl_const_binds.hpp> #include <boost/utility/identity_type.hpp> #include <boost/scope_exit.hpp> #include <boost/type_traits/remove_reference.hpp> #include <boost/type_traits/function_traits.hpp> #include <boost/preprocessor/control/expr_iif.hpp> #include <boost/preprocessor/control/iif.hpp> #include <boost/preprocessor/facilities/empty.hpp> #include <boost/preprocessor/facilities/is_empty.hpp> #include <boost/preprocessor/facilities/identity.hpp> #include <boost/preprocessor/logical/bitand.hpp> #include <boost/preprocessor/punctuation/comma_if.hpp> #include <boost/preprocessor/tuple/elem.hpp> #include <boost/preprocessor/tuple/eat.hpp> #include <boost/preprocessor/list/adt.hpp> #include <boost/preprocessor/list/for_each_i.hpp> #include <boost/preprocessor/list/append.hpp> // PRIVATE // #define BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_PARAMS_VAR_(id) \ BOOST_LOCAL_FUNCTION_AUX_SYMBOL( (params)(id) ) #define BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_TAG_DECL_(r, id, i, bind_traits) \ BOOST_SCOPE_EXIT_DETAIL_TAG_DECL(r, id, i, \ BOOST_LOCAL_FUNCTION_AUX_PP_BIND_TRAITS_VAR_WITHOUT_TYPE( \ bind_traits)) #define BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_CAPTURE_DECL_TYPED_( \ r, id, typename01, i, bind_traits) \ typedef BOOST_PP_EXPR_IIF(typename01, typename) \ /* remove ref because typed var can have & prefix */ \ ::boost::remove_reference< BOOST_PP_EXPR_IIF(typename01, typename) \ ::boost::function_traits< \ /* instead of using Boost.Typeof, get bind type as 1st */ \ /* argument type of func type `void (type_ [&] var_)` */ \ void ( BOOST_LOCAL_FUNCTION_AUX_PP_BIND_TRAITS_VAR_WITH_TYPE( \ bind_traits) ) \ >::arg1_type \ >::type \ BOOST_SCOPE_EXIT_DETAIL_CAPTURE_T(id, i, \ BOOST_LOCAL_FUNCTION_AUX_PP_BIND_TRAITS_VAR_WITHOUT_TYPE( \ bind_traits)) \ ; /* close typedef */ #define BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_CAPTURE_DECL_DEDUCED_( \ r, id, typename01, i, bind_traits) \ BOOST_SCOPE_EXIT_DETAIL_CAPTURE_DECL(r, \ ( \ id \ , \ /* ScopeExit expects typename or EMPTY() here */ \ BOOST_PP_EXPR_IIF(typename01, typename) \ ), \ i, BOOST_LOCAL_FUNCTION_AUX_PP_BIND_TRAITS_VAR_WITHOUT_TYPE( \ bind_traits)) #define BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_CAPTURE_DECL_( \ r, id_typename, i, bind_traits) \ BOOST_PP_IIF(BOOST_PP_IS_EMPTY( \ BOOST_LOCAL_FUNCTION_AUX_PP_BIND_TRAITS_VAR_WITH_TYPE(bind_traits)), \ BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_CAPTURE_DECL_DEDUCED_ \ , \ BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_CAPTURE_DECL_TYPED_ \ )(r, BOOST_PP_TUPLE_ELEM(2, 0, id_typename), \ BOOST_PP_TUPLE_ELEM(2, 1, id_typename), i, bind_traits) #define BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_PARAM_DECL_( \ r, id_typename, i, bind_traits) \ BOOST_SCOPE_EXIT_DETAIL_PARAM_DECL(r, \ ( \ BOOST_PP_TUPLE_ELEM(2, 0, id_typename) \ , \ /* ScopeExit expects typename or EMPTY() here */ \ BOOST_PP_EXPR_IIF(BOOST_PP_TUPLE_ELEM(2, 1, id_typename), \ typename \ ) \ ), \ i, BOOST_LOCAL_FUNCTION_AUX_PP_BIND_TRAITS_VAR_WITHOUT_TYPE( \ bind_traits)) #define BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_MEMBER_DECL_VAR_( \ r, id, typename01, i, var) \ BOOST_PP_EXPR_IIF(typename01, typename) \ BOOST_IDENTITY_TYPE(( /* must use IDENTITY because of tparam comma */ \ ::boost::scope_exit::detail::member< \ BOOST_SCOPE_EXIT_DETAIL_PARAM_T(id, i, var) \ , BOOST_SCOPE_EXIT_DETAIL_TAG(id, i) \ > \ )) \ BOOST_SCOPE_EXIT_DETAIL_PARAM(id, i, var); #define BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_MEMBER_DECL_( \ r, id_typename, i, bind_traits) \ BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_MEMBER_DECL_VAR_(r, \ BOOST_PP_TUPLE_ELEM(2, 0, id_typename), \ BOOST_PP_TUPLE_ELEM(2, 1, id_typename), \ i, BOOST_LOCAL_FUNCTION_AUX_PP_BIND_TRAITS_VAR_WITHOUT_TYPE( \ bind_traits)) #define BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_PARAM_INIT_(r, id, i, bind_traits) \ BOOST_SCOPE_EXIT_DETAIL_PARAM_INIT(r, id, i, \ BOOST_LOCAL_FUNCTION_AUX_PP_BIND_TRAITS_VAR_WITHOUT_TYPE( \ bind_traits)) #define BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_THIS_CAPTURE_TYPE_(id) \ BOOST_LOCAL_FUNCTION_AUX_SYMBOL( (this_capture_type)(id) ) #define BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_THIS_TYPE_(id) \ BOOST_LOCAL_FUNCTION_AUX_SYMBOL( (this_type)(id) ) #define BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_THIS_TYPEDEF_DEDUCED_( \ id, typename01, all_bind_this_types) \ BOOST_SCOPE_EXIT_DETAIL_TYPEDEF_TYPEOF_THIS(id, \ BOOST_PP_EXPR_IIF(typename01, typename), /* otherwise EMPTY() */ \ BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_THIS_CAPTURE_TYPE_(id)) #define BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_THIS_TYPEDEF_TYPED_( \ id, typename01, all_bind_this_types) \ typedef \ BOOST_LOCAL_FUNCTION_AUX_PP_BIND_TRAITS_THIS_TYPE(BOOST_PP_LIST_FIRST( \ all_bind_this_types)) \ BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_THIS_CAPTURE_TYPE_(id) \ ; #define BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_THIS_TYPEDEF_( \ id, typename01, all_bind_this_types) \ /* typedef type_ */ \ BOOST_PP_IIF(BOOST_PP_IS_EMPTY( \ /* all_bind_this_type is list with 1 elem (possibly PP_EMPTY), */ \ /* otherwise got a pp-parsing error before getting here */ \ BOOST_LOCAL_FUNCTION_AUX_PP_BIND_TRAITS_THIS_TYPE( \ BOOST_PP_LIST_FIRST(all_bind_this_types))), \ BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_THIS_TYPEDEF_DEDUCED_ \ , \ BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_THIS_TYPEDEF_TYPED_ \ )(id, typename01, all_bind_this_types) #define BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_ALL_( \ all_binds, all_bind_this_types, id, typename01) \ /* binding tags */ \ BOOST_PP_IIF(BOOST_PP_LIST_IS_CONS(all_bind_this_types), \ BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_THIS_TYPEDEF_ \ , \ BOOST_PP_TUPLE_EAT(3) \ )(id, typename01, all_bind_this_types) \ BOOST_PP_LIST_FOR_EACH_I(BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_TAG_DECL_, id, \ all_binds) \ BOOST_PP_LIST_FOR_EACH_I(BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_CAPTURE_DECL_, \ (id, typename01), all_binds) \ /* binding class */ \ struct BOOST_SCOPE_EXIT_DETAIL_PARAMS_T(id) { \ /* interim capture types to workaround internal error on old GCC */ \ BOOST_PP_EXPR_IIF(BOOST_PP_LIST_IS_CONS(all_bind_this_types), \ typedef BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_THIS_CAPTURE_TYPE_(id) \ BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_THIS_TYPE_(id) ; \ ) \ BOOST_PP_EXPR_IIF(BOOST_PP_LIST_IS_CONS(all_bind_this_types), \ BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_THIS_TYPE_(id) \ BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_THIS_VAR; \ ) \ BOOST_PP_LIST_FOR_EACH_I( \ BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_PARAM_DECL_, \ (id, typename01), all_binds) \ BOOST_PP_LIST_FOR_EACH_I( \ BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_MEMBER_DECL_, \ (id, typename01), all_binds) \ } BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_PARAMS_VAR_(id) = \ /* NOTE: there is no way to wrap member initializer commas within */ \ /* parenthesis so you must handle these commas manually if expanding */ \ /* this macro within another macro */ \ { \ /* initialize the struct with param values to bind */ \ BOOST_PP_EXPR_IIF(BOOST_PP_LIST_IS_CONS(all_bind_this_types), \ this) /* here name `this` access object at enclosing scope */ \ BOOST_PP_COMMA_IF(BOOST_PP_BITAND( \ BOOST_PP_LIST_IS_CONS(all_bind_this_types) \ , BOOST_PP_LIST_IS_CONS(all_binds) \ )) \ BOOST_PP_LIST_FOR_EACH_I( \ BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_PARAM_INIT_, id, all_binds) \ }; #define BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_(id, typename01, decl_traits) \ /* IMPORTANT: the order of these appends is important, it must follow */ \ /* the indexing order used by the functor code which starts */ \ /* enumerating const binds and then non-const binds */ \ BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_ALL_( \ BOOST_PP_LIST_APPEND( \ BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_CONST_BINDS( \ decl_traits),\ BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_BINDS( \ decl_traits)), \ BOOST_PP_LIST_APPEND( \ BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_CONST_BIND_THIS_TYPES(decl_traits), \ BOOST_LOCAL_FUNCTION_AUX_PP_DECL_TRAITS_BIND_THIS_TYPES( \ decl_traits)), \ id, typename01) // PUBLIC // #define BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_THIS_TYPE(id, typename01) \ BOOST_PP_EXPR_IIF(typename01, typename) \ BOOST_SCOPE_EXIT_DETAIL_PARAMS_T(id):: \ BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_THIS_TYPE_(id) #define BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_THIS_VAR \ BOOST_LOCAL_FUNCTION_AUX_SYMBOL( (this_var) ) #define BOOST_LOCAL_FUNCTION_AUX_CODE_BIND(id, typename01, decl_traits) \ /* the binding data structures must be declared and initialized (to */ \ /* empty structs, so hopefully the compiler will optimize away the */ \ /* no-op code) even when there is no bound param because these structs */ \ /* are used to init `...args.value` which is always used by the `END` */ \ /* macro later because this macro does not know if there are bound */ \ /* params or not */ \ BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_(id, typename01, decl_traits) \ /* this code takes advantage of the template argument list/comparison */ \ /* operator ambiguity to declare a variable iff it hasn't already been */ \ /* declared in that scope; the second occurrence is parsed as: */ \ /* (declared<(resolve<sizeof(boost_local_auxXargs)>::cmp1<0)>::cmp2> */ \ /* ...Xargs); */ \ /* which is a no-op */ \ ::boost::scope_exit::detail::declared< boost::scope_exit::detail::resolve< \ /* cannot prefix with `::` as in `sizeof(:: ...` because the name */ \ /* must refer to the local variable name to allow multiple local */ \ /* functions (and exits) within the same scope (however this */ \ /* does not allow for nesting because local variables cannot be */ \ /* used in nested code blocks) */ \ sizeof(BOOST_LOCAL_FUNCTION_AUX_DECL_ARGS_VAR) \ >::cmp1<0>::cmp2 > BOOST_LOCAL_FUNCTION_AUX_DECL_ARGS_VAR; \ /* stores bound types/values into `...args` variable (args variable */ \ /* can be accessed by `NAME` macro because doesn't use __LINE__ id) */ \ BOOST_LOCAL_FUNCTION_AUX_DECL_ARGS_VAR.value = \ &BOOST_LOCAL_FUNCTION_AUX_CODE_BIND_PARAMS_VAR_(id); #endif // #include guard