boost/mpl/transform.hpp
//-----------------------------------------------------------------------------
// boost mpl/transform.hpp header file
// See http://www.boost.org for updates, documentation, and revision history.
//-----------------------------------------------------------------------------
//
// Copyright (c) 2000-03
// Dave Abrahams, Aleksey Gurtovoy
//
// Permission to use, copy, modify, distribute and sell this software
// and its documentation for any purpose is hereby granted without fee,
// provided that the above copyright notice appears in all copies and
// that both the copyright notice and this permission notice appear in
// supporting documentation. No representations are made about the
// suitability of this software for any purpose. It is provided "as is"
// without express or implied warranty.
#ifndef BOOST_MPL_TRANSFORM_HPP_INCLUDED
#define BOOST_MPL_TRANSFORM_HPP_INCLUDED
#include "boost/mpl/fold_backward.hpp"
#include "boost/mpl/push_front.hpp"
#include "boost/mpl/clear.hpp"
#include "boost/mpl/lambda.hpp"
#include "boost/mpl/apply.hpp"
#include "boost/mpl/pair.hpp"
#include "boost/mpl/protect.hpp"
#include "boost/mpl/iterator_tag.hpp"
#include "boost/mpl/apply_if.hpp"
#include "boost/mpl/aux_/common_name_wknd.hpp"
#include "boost/mpl/aux_/void_spec.hpp"
#include "boost/type_traits/is_same.hpp"
namespace boost {
namespace mpl {
BOOST_MPL_AUX_COMMON_NAME_WKND(transform)
namespace aux {
template< typename Op >
struct transform_op
{
template< typename Sequence, typename T > struct apply
{
typedef typename push_front<
Sequence
, typename apply1<Op,T>::type
>::type type;
};
};
template< typename Op >
struct transform2_op
{
template< typename Sequence, typename T > struct apply
{
typedef typename push_front<
Sequence
, typename apply2<
Op
, typename T::first
, typename T::second
>::type
>::type type;
};
};
template< typename I1, typename I2 >
struct pair_iterator
{
typedef input_iter_tag_ category;
typedef pair<typename I1::type, typename I2::type> type;
typedef pair_iterator<typename I1::next, typename I2::next> next;
};
template<
typename Seq1, typename Seq2
>
struct pair_view
{
public:
typedef nested_begin_end_tag tag;
typedef pair_iterator<
typename mpl::begin<Seq1>::type
, typename mpl::begin<Seq2>::type
> begin;
typedef pair_iterator<
typename mpl::end<Seq1>::type
, typename mpl::end<Seq2>::type
> end;
};
} // namespace aux
BOOST_MPL_AUX_AGLORITHM_NAMESPACE_BEGIN
template<
typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Sequence)
, typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Operation)
>
struct transform1
{
private:
typedef typename lambda<Operation>::type op_;
typedef typename clear<Sequence>::type result_;
public:
typedef typename fold_backward<
Sequence
, result_
, protect< aux::transform_op<op_> >
>::type type;
};
template<
typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Seq1)
, typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Seq2)
, typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Operation)
>
struct transform2
{
private:
typedef typename lambda<Operation>::type op_;
typedef typename clear<Seq1>::type result_;
public:
typedef typename fold_backward<
aux::pair_view<Seq1,Seq2>
, result_
, protect< aux::transform2_op<op_> >
>::type type;
};
template<
typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Seq1)
, typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Seq2OrOperation)
, typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Operation)
>
struct transform
: apply_if<
is_same<Operation,void_>
, transform1<Seq1,Seq2OrOperation>
, transform2<Seq1,Seq2OrOperation,Operation>
>
{
};
BOOST_MPL_AUX_AGLORITHM_NAMESPACE_END
BOOST_MPL_AUX_ALGORITHM_VOID_SPEC(2, transform1)
BOOST_MPL_AUX_ALGORITHM_VOID_SPEC(3, transform2)
BOOST_MPL_AUX_ALGORITHM_VOID_SPEC(3, transform)
} // namespace mpl
} // namespace boost
#endif // BOOST_MPL_TRANSFORM_HPP_INCLUDED