forked from boostorg/mpl
159 lines
4.1 KiB
C++
159 lines
4.1 KiB
C++
//-----------------------------------------------------------------------------
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// boost mpl/transform.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) 2000-03
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// Dave Abrahams, 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_TRANSFORM_HPP_INCLUDED
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#define BOOST_MPL_TRANSFORM_HPP_INCLUDED
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#include "boost/mpl/fold_backward.hpp"
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#include "boost/mpl/push_front.hpp"
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#include "boost/mpl/clear.hpp"
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#include "boost/mpl/lambda.hpp"
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#include "boost/mpl/apply.hpp"
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#include "boost/mpl/pair.hpp"
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#include "boost/mpl/protect.hpp"
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#include "boost/mpl/iterator_tag.hpp"
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#include "boost/mpl/apply_if.hpp"
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#include "boost/mpl/aux_/common_name_wknd.hpp"
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#include "boost/mpl/aux_/void_spec.hpp"
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#include "boost/type_traits/is_same.hpp"
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namespace boost {
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namespace mpl {
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BOOST_MPL_AUX_COMMON_NAME_WKND(transform)
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namespace aux {
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template< typename Op >
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struct transform_op
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{
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template< typename Sequence, typename T > struct apply
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{
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typedef typename push_front<
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Sequence
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, typename apply1<Op,T>::type
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>::type type;
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};
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};
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template< typename Op >
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struct transform2_op
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{
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template< typename Sequence, typename T > struct apply
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{
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typedef typename push_front<
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Sequence
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, typename apply2<
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Op
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, typename T::first
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, typename T::second
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>::type
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>::type type;
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};
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};
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template< typename I1, typename I2 >
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struct pair_iterator
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{
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typedef input_iter_tag_ category;
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typedef pair<typename I1::type, typename I2::type> type;
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typedef pair_iterator<typename I1::next, typename I2::next> next;
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};
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template<
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typename Seq1, typename Seq2
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>
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struct pair_view
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{
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public:
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typedef nested_begin_end_tag tag;
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typedef pair_iterator<
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typename mpl::begin<Seq1>::type
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, typename mpl::begin<Seq2>::type
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> begin;
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typedef pair_iterator<
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typename mpl::end<Seq1>::type
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, typename mpl::end<Seq2>::type
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> end;
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};
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} // namespace aux
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BOOST_MPL_AUX_AGLORITHM_NAMESPACE_BEGIN
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template<
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typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Sequence)
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, typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Operation)
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>
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struct transform1
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{
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private:
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typedef typename lambda<Operation>::type op_;
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typedef typename clear<Sequence>::type result_;
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public:
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typedef typename fold_backward<
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Sequence
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, result_
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, protect< aux::transform_op<op_> >
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>::type type;
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};
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template<
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typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Seq1)
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, typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Seq2)
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, typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Operation)
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>
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struct transform2
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{
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private:
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typedef typename lambda<Operation>::type op_;
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typedef typename clear<Seq1>::type result_;
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public:
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typedef typename fold_backward<
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aux::pair_view<Seq1,Seq2>
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, result_
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, protect< aux::transform2_op<op_> >
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>::type type;
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};
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template<
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typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Seq1)
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, typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Seq2OrOperation)
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, typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Operation)
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>
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struct transform
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: apply_if<
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is_same<Operation,void_>
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, transform1<Seq1,Seq2OrOperation>
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, transform2<Seq1,Seq2OrOperation,Operation>
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>
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{
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};
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BOOST_MPL_AUX_AGLORITHM_NAMESPACE_END
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BOOST_MPL_AUX_ALGORITHM_VOID_SPEC(2, transform1)
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BOOST_MPL_AUX_ALGORITHM_VOID_SPEC(3, transform2)
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BOOST_MPL_AUX_ALGORITHM_VOID_SPEC(3, transform)
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} // namespace mpl
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} // namespace boost
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#endif // BOOST_MPL_TRANSFORM_HPP_INCLUDED
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