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mpl_v2 checkin
[SVN r13330]
This commit is contained in:
Aleksey Gurtovoy
312
include/boost/mpl/apply.hpp
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312
include/boost/mpl/apply.hpp
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//-----------------------------------------------------------------------------
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// boost mpl/apply.hpp header file
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// See http://www.boost.org for updates, documentation, and revision history.
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//-----------------------------------------------------------------------------
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//
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// Copyright (c) 2000-02
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// Aleksey Gurtovoy
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//
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// Permission to use, copy, modify, distribute and sell this software
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// and its documentation for any purpose is hereby granted without fee,
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// provided that the above copyright notice appears in all copies and
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// that both the copyright notice and this permission notice appear in
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// supporting documentation. No representations are made about the
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// suitability of this software for any purpose. It is provided "as is"
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// without express or implied warranty.
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#ifndef BOOST_MPL_APPLY_HPP_INCLUDED
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#define BOOST_MPL_APPLY_HPP_INCLUDED
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#include "boost/mpl/aux_/config/use_preprocessed.hpp"
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#if defined(BOOST_MPL_USE_PREPROCESSED_HEADERS)
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# include "boost/mpl/aux_/preprocessed/apply.hpp"
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#else
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#include "boost/mpl/placeholder.hpp"
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#include "boost/mpl/limits/arity.hpp"
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#include "boost/mpl/aux_/lambda_spec.hpp"
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#include "boost/mpl/aux_/count_if_not.hpp"
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#include "boost/mpl/aux_/arity.hpp"
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#include "boost/mpl/aux_/none.hpp"
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#include "boost/mpl/aux_/msvc_workarounds.hpp"
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#include "boost/mpl/aux_/preprocessor/params.hpp"
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#include "boost/mpl/aux_/preprocessor/default_params.hpp"
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#include "boost/mpl/aux_/preprocessor/enum.hpp"
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#include "boost/mpl/aux_/preprocessor/project1st.hpp"
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#include "boost/mpl/aux_/config/dtp.hpp"
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#include "boost/preprocessor/arithmetic/add.hpp"
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#include "boost/preprocessor/arithmetic/sub.hpp"
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#include "boost/preprocessor/repeat_2nd.hpp"
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#include "boost/preprocessor/repeat_3rd.hpp"
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#include "boost/preprocessor/comma_if.hpp"
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#include "boost/preprocessor/if.hpp"
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#include "boost/preprocessor/inc.hpp"
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#include "boost/config.hpp"
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namespace boost {
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namespace mpl {
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// local macros, #undef-ined at the end of the header
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#define AUX_APPLY_PARAMS(param) \
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BOOST_MPL_PP_PARAMS( \
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1 \
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, BOOST_PP_INC(BOOST_MPL_METAFUNCTION_MAX_ARITY) \
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, param \
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) \
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/**/
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#define AUX_APPLY_DEFAULT_PARAMS(param, value) \
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BOOST_MPL_PP_DEFAULT_PARAMS( \
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1 \
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, BOOST_PP_INC(BOOST_MPL_METAFUNCTION_MAX_ARITY) \
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, param \
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, value \
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) \
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/**/
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#define AUX_APPLY_N_PARAMS(i, param) \
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BOOST_MPL_PP_PARAMS(1, BOOST_PP_INC(i), param) \
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/**/
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#define AUX_APPLY_N_PLACEHOLDERS(i) \
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BOOST_MPL_PP_ENUM(0, BOOST_PP_INC(i), BOOST_MPL_PP_PROJECT2ND, _) \
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/**/
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#define AUX_APPLY_0_TEMPLATE_DEF(unused) \
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template< typename F > \
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struct apply0 : F \
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{ \
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}; \
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\
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template<> \
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struct apply0<_> \
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{ \
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template< typename F > struct apply \
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: F \
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{ \
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}; \
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}; \
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/**/
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#if defined(BOOST_MSVC) && (BOOST_MSVC < 1300)
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// 'apply0' workaround
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template< typename F > struct apply0;
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template<> struct apply0<int> { typedef apply0 type; };
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#define AUX_APPLY_N_TEMPLATE_DEF(i) \
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namespace aux { \
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BOOST_MPL_AUX_MSVC_DEPENDENT_TEMPLATE_WRAPPER_DEF(msvc_apply##i, apply, i) \
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} \
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template< \
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typename F \
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, AUX_APPLY_N_PARAMS(i, typename T) \
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> \
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struct apply##i \
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: aux::msvc_apply##i<F>::template result_<AUX_APPLY_N_PARAMS(i, T)> \
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{ \
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}; \
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\
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template<> \
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struct apply##i< AUX_APPLY_N_PLACEHOLDERS(i) > \
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{ \
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template< \
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typename F \
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, AUX_APPLY_N_PARAMS(i, typename T) \
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> \
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struct apply \
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: aux::msvc_apply##i<F>::template result_<AUX_APPLY_N_PARAMS(i, T)> \
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{ \
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}; \
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}; \
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/**/
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#elif defined(BOOST_NO_DEFAULT_TEMPLATE_PARAMETERS_IN_NESTED_TEMPLATES)
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// agurt, 10/mar/02: MWCW 8.0 "losts" default template parameters of nested
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// class templates when their owner classes are passed as arguments to
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// other templates; in particular, that means that 'apply#' won't work on
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// the result of 'bind#<..>' expression if no special care is taken;
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// whatever is below, it is supposed to workaround the problem
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#define AUX_APPLY_IMPL_N_TEMPLATE_SPEC(j,i) \
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namespace aux { \
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template< \
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typename F \
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, AUX_APPLY_N_PARAMS(i, typename T) \
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> \
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struct mwcw_apply##i< \
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BOOST_PP_ADD(i, j) \
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, F \
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, AUX_APPLY_N_PARAMS(i, T) \
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> \
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{ \
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typedef typename F::template apply< \
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AUX_APPLY_N_PARAMS(i, T) \
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BOOST_PP_COMMA_IF(j) \
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BOOST_MPL_PP_ENUM(0, j, BOOST_MPL_PP_PROJECT2ND, aux::none) \
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> type; \
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}; \
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} \
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/**/
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#define AUX_APPLY_N_TEMPLATE_DEF(i) \
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namespace aux { \
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template< \
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long \
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, typename F \
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, AUX_APPLY_N_PARAMS(i, typename T) \
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> \
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struct mwcw_apply##i; \
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} \
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\
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BOOST_PP_REPEAT_3RD( \
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BOOST_PP_INC(BOOST_PP_SUB(BOOST_MPL_METAFUNCTION_MAX_ARITY, i)) \
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, AUX_APPLY_IMPL_N_TEMPLATE_SPEC \
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, i \
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) \
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\
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template< \
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typename F \
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, AUX_APPLY_N_PARAMS(i, typename T) \
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> \
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struct apply##i \
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: aux::mwcw_apply##i< \
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aux::arity<F,i>::value \
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, F \
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, AUX_APPLY_N_PARAMS(i, T) \
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>::type \
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{ \
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}; \
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\
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template<> \
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struct apply##i< AUX_APPLY_N_PLACEHOLDERS(i) > \
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{ \
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template< \
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typename F \
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, AUX_APPLY_N_PARAMS(i, typename T) \
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> \
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struct apply \
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: aux::mwcw_apply##i< \
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aux::arity<F,i>::value \
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, F \
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, AUX_APPLY_N_PARAMS(i, T) \
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>::type \
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{ \
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}; \
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}; \
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/**/
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#else // #elif defined(BOOST_NO_DEFAULT_TEMPLATE_PARAMETERS_IN_NESTED_TEMPLATES)
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#define AUX_APPLY_N_TEMPLATE_DEF(i) \
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template< \
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typename F \
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, AUX_APPLY_N_PARAMS(i, typename T) \
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> \
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struct apply##i \
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: F::template apply< \
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AUX_APPLY_N_PARAMS(i, T) \
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> \
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{ \
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}; \
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\
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template<> \
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struct apply##i< AUX_APPLY_N_PLACEHOLDERS(i) > \
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{ \
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template< \
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typename F \
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, AUX_APPLY_N_PARAMS(i, typename T) \
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> \
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struct apply \
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: F::template apply< \
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AUX_APPLY_N_PARAMS(i, T) \
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> \
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{ \
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}; \
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}; \
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/**/
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#endif // #if defined(BOOST_MSVC) && (BOOST_MSVC < 1300)
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namespace aux {
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// to be able to define specializations
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template<long> struct apply_impl_chooser;
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}
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#define AUX_APPLY_IMPL_CHOOSER_SPEC(i) \
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namespace aux { \
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template<> \
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struct apply_impl_chooser<i> \
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{ \
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template< typename F, AUX_APPLY_PARAMS(typename T) > \
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struct result_ \
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{ \
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typedef apply##i< \
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F \
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BOOST_PP_COMMA_IF(i) AUX_APPLY_N_PARAMS(i, T) \
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> type; \
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}; \
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}; \
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} \
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/**/
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#define AUX_APPLY_TEMPLATE_DEF(i, unused) \
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BOOST_PP_IF( \
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i \
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, AUX_APPLY_N_TEMPLATE_DEF \
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, AUX_APPLY_0_TEMPLATE_DEF \
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)(i) \
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\
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BOOST_MPL_AUX_LAMBDA_TEMPLATE_SPEC( \
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BOOST_PP_INC(i) \
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, apply##i \
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) \
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\
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AUX_APPLY_IMPL_CHOOSER_SPEC(i) \
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/**/
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// apply#
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BOOST_PP_REPEAT_2ND(
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BOOST_PP_INC(BOOST_MPL_METAFUNCTION_MAX_ARITY)
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, AUX_APPLY_TEMPLATE_DEF
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, unused
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)
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BOOST_MPL_AUX_COUNT_IF_NOT(apply, BOOST_MPL_METAFUNCTION_MAX_ARITY)
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#if !defined(BOOST_MSVC) || (BOOST_MSVC > 1200)
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// agurt, 15/jan/02: top-level 'apply' template gives an ICE on MSVC
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// (for known reasons); numbered form works, though
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template<
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typename F
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, AUX_APPLY_DEFAULT_PARAMS(typename T, aux::none)
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>
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struct apply
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: aux::apply_impl_chooser<
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aux::apply_count_if_not<aux::none, AUX_APPLY_PARAMS(T)>::value
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>::template result_< F, AUX_APPLY_PARAMS(T) >::type
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{
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};
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#define BOOST_MPL_HAS_APPLY
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#endif // !defined(BOOST_MSVC) || (BOOST_MSVC > 1200)
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#undef AUX_APPLY_TEMPLATE_DEF
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#undef AUX_APPLY_N_TEMPLATE_DEF
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#undef AUX_APPLY_0_TEMPLATE_DEF
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#undef AUX_APPLY_IMPL_N_TEMPLATE_SPEC
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#undef AUX_APPLY_N_PLACEHOLDERS
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#undef AUX_APPLY_N_PARAMS
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#undef AUX_APPLY_DEFAULT_PARAMS
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#undef AUX_APPLY_PARAMS
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} // namespace mpl
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} // namespace boost
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#endif // #if defined(BOOST_MPL_USE_PREPROCESSED_HEADERS)
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#endif // BOOST_MPL_APPLY_HPP_INCLUDED
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