early-access version 3088

This commit is contained in:
pineappleEA
2022-11-05 15:35:56 +01:00
parent 4e4fc25ce3
commit b601909c6d
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///////////////////////////////////////////////////////////////////////////////
/// \file fusion.hpp
/// Proto callables for things found in the Fusion library
//
// Copyright 2010 Eric Niebler. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_PROTO_FUNCTIONAL_FUSION_HPP_EAN_11_27_2010
#define BOOST_PROTO_FUNCTIONAL_FUSION_HPP_EAN_11_27_2010
#include <boost/proto/functional/fusion/at.hpp>
#include <boost/proto/functional/fusion/pop_back.hpp>
#include <boost/proto/functional/fusion/pop_front.hpp>
#include <boost/proto/functional/fusion/push_back.hpp>
#include <boost/proto/functional/fusion/push_front.hpp>
#include <boost/proto/functional/fusion/reverse.hpp>
#endif

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///////////////////////////////////////////////////////////////////////////////
/// \file at.hpp
/// Proto callables Fusion at
//
// Copyright 2010 Eric Niebler. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_PROTO_FUNCTIONAL_FUSION_AT_HPP_EAN_11_27_2010
#define BOOST_PROTO_FUNCTIONAL_FUSION_AT_HPP_EAN_11_27_2010
#include <boost/type_traits/add_const.hpp>
#include <boost/type_traits/remove_const.hpp>
#include <boost/type_traits/remove_reference.hpp>
#include <boost/fusion/include/at.hpp>
#include <boost/proto/proto_fwd.hpp>
namespace boost { namespace proto { namespace functional
{
/// \brief A PolymorphicFunctionObject type that invokes the
/// \c fusion::at() accessor on its argument.
///
/// A PolymorphicFunctionObject type that invokes the
/// \c fusion::at() accessor on its argument.
struct at
{
BOOST_PROTO_CALLABLE()
template<typename Sig>
struct result;
template<typename This, typename Seq, typename N>
struct result<This(Seq, N)>
: fusion::result_of::at<
typename boost::remove_reference<Seq>::type
, typename boost::remove_const<typename boost::remove_reference<N>::type>::type
>
{};
template<typename Seq, typename N>
typename fusion::result_of::at<Seq, N>::type
operator ()(Seq &seq, N const & BOOST_PROTO_DISABLE_IF_IS_CONST(Seq)) const
{
return fusion::at<N>(seq);
}
template<typename Seq, typename N>
typename fusion::result_of::at<Seq const, N>::type
operator ()(Seq const &seq, N const &) const
{
return fusion::at<N>(seq);
}
};
}}}
#endif

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///////////////////////////////////////////////////////////////////////////////
/// \file pop_back.hpp
/// Proto callables Fusion pop_back
//
// Copyright 2010 Eric Niebler. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_PROTO_FUNCTIONAL_FUSION_POP_BACK_HPP_EAN_11_27_2010
#define BOOST_PROTO_FUNCTIONAL_FUSION_POP_BACK_HPP_EAN_11_27_2010
#include <boost/fusion/include/begin.hpp>
#include <boost/fusion/include/end.hpp>
#include <boost/fusion/include/prior.hpp>
#include <boost/fusion/include/pop_back.hpp>
#include <boost/proto/proto_fwd.hpp>
namespace boost { namespace proto { namespace functional
{
/// \brief A PolymorphicFunctionObject type that invokes the
/// \c fusion::pop_back() algorithm on its argument.
///
/// A PolymorphicFunctionObject type that invokes the
/// \c fusion::pop_back() algorithm on its argument.
struct pop_back
{
BOOST_PROTO_CALLABLE()
template<typename Sig>
struct result;
template<typename This, typename Seq>
struct result<This(Seq)>
: result<This(Seq const &)>
{};
template<typename This, typename Seq>
struct result<This(Seq &)>
: fusion::result_of::pop_back<Seq>
{};
template<typename Seq>
typename fusion::result_of::pop_back<Seq>::type
operator ()(Seq &seq) const
{
// Work around a const-correctness issue in Fusion
typedef typename fusion::result_of::pop_back<Seq>::type result_type;
return result_type(fusion::begin(seq), fusion::prior(fusion::end(seq)));
}
template<typename Seq>
typename fusion::result_of::pop_back<Seq const>::type
operator ()(Seq const &seq) const
{
return fusion::pop_back(seq);
}
};
}}}
#endif

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///////////////////////////////////////////////////////////////////////////////
/// \file pop_front.hpp
/// Proto callables Fusion pop_front
//
// Copyright 2010 Eric Niebler. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_PROTO_FUNCTIONAL_FUSION_POP_FRONT_HPP_EAN_11_27_2010
#define BOOST_PROTO_FUNCTIONAL_FUSION_POP_FRONT_HPP_EAN_11_27_2010
#include <boost/fusion/include/begin.hpp>
#include <boost/fusion/include/end.hpp>
#include <boost/fusion/include/next.hpp>
#include <boost/fusion/include/pop_front.hpp>
#include <boost/proto/proto_fwd.hpp>
namespace boost { namespace proto { namespace functional
{
/// \brief A PolymorphicFunctionObject type that invokes the
/// \c fusion::pop_front() algorithm on its argument.
///
/// A PolymorphicFunctionObject type that invokes the
/// \c fusion::pop_front() algorithm on its argument. This is
/// useful for defining a CallableTransform like \c pop_front(_)
/// which removes the first child from a Proto expression node.
/// Such a transform might be used as the first argument to the
/// \c proto::fold\<\> transform; that is, fold all but
/// the first child.
struct pop_front
{
BOOST_PROTO_CALLABLE()
template<typename Sig>
struct result;
template<typename This, typename Seq>
struct result<This(Seq)>
: result<This(Seq const &)>
{};
template<typename This, typename Seq>
struct result<This(Seq &)>
: fusion::result_of::pop_front<Seq>
{};
template<typename Seq>
typename fusion::result_of::pop_front<Seq>::type
operator ()(Seq &seq) const
{
// Work around a const-correctness issue in Fusion
typedef typename fusion::result_of::pop_front<Seq>::type result_type;
return result_type(fusion::next(fusion::begin(seq)), fusion::end(seq));
}
template<typename Seq>
typename fusion::result_of::pop_front<Seq const>::type
operator ()(Seq const &seq) const
{
return fusion::pop_front(seq);
}
};
}}}
#endif

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///////////////////////////////////////////////////////////////////////////////
/// \file push_back.hpp
/// Proto callables Fusion push_back
//
// Copyright 2010 Eric Niebler. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_PROTO_FUNCTIONAL_FUSION_PUSH_BACK_HPP_EAN_11_27_2010
#define BOOST_PROTO_FUNCTIONAL_FUSION_PUSH_BACK_HPP_EAN_11_27_2010
#include <boost/type_traits/add_const.hpp>
#include <boost/type_traits/remove_const.hpp>
#include <boost/type_traits/remove_reference.hpp>
#include <boost/fusion/include/push_back.hpp>
#include <boost/proto/proto_fwd.hpp>
namespace boost { namespace proto { namespace functional
{
/// \brief A PolymorphicFunctionObject type that invokes the
/// \c fusion::push_back() algorithm on its argument.
///
/// A PolymorphicFunctionObject type that invokes the
/// \c fusion::push_back() algorithm on its argument.
struct push_back
{
BOOST_PROTO_CALLABLE()
template<typename Sig>
struct result;
template<typename This, typename Seq, typename T>
struct result<This(Seq, T)>
: fusion::result_of::push_back<
typename boost::add_const<typename boost::remove_reference<Seq>::type>::type
, typename boost::remove_const<typename boost::remove_reference<T>::type>::type
>
{};
template<typename Seq, typename T>
typename fusion::result_of::push_back<Seq const, T>::type
operator ()(Seq const &seq, T const &t) const
{
return fusion::push_back(seq, t);
}
};
}}}
#endif

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///////////////////////////////////////////////////////////////////////////////
/// \file push_front.hpp
/// Proto callables Fusion push_front
//
// Copyright 2010 Eric Niebler. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_PROTO_FUNCTIONAL_FUSION_PUSH_FRONT_HPP_EAN_11_27_2010
#define BOOST_PROTO_FUNCTIONAL_FUSION_PUSH_FRONT_HPP_EAN_11_27_2010
#include <boost/type_traits/add_const.hpp>
#include <boost/type_traits/remove_const.hpp>
#include <boost/type_traits/remove_reference.hpp>
#include <boost/fusion/include/push_front.hpp>
#include <boost/proto/proto_fwd.hpp>
namespace boost { namespace proto { namespace functional
{
/// \brief A PolymorphicFunctionObject type that invokes the
/// \c fusion::push_front() algorithm on its argument.
///
/// A PolymorphicFunctionObject type that invokes the
/// \c fusion::push_front() algorithm on its argument.
struct push_front
{
BOOST_PROTO_CALLABLE()
template<typename Sig>
struct result;
template<typename This, typename Seq, typename T>
struct result<This(Seq, T)>
: fusion::result_of::push_front<
typename boost::add_const<typename boost::remove_reference<Seq>::type>::type
, typename boost::remove_const<typename boost::remove_reference<T>::type>::type
>
{};
template<typename Seq, typename T>
typename fusion::result_of::push_front<Seq const, T>::type
operator ()(Seq const &seq, T const &t) const
{
return fusion::push_front(seq, t);
}
};
}}}
#endif

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///////////////////////////////////////////////////////////////////////////////
/// \file reverse.hpp
/// Proto callables Fusion reverse
//
// Copyright 2010 Eric Niebler. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_PROTO_FUNCTIONAL_FUSION_REVERSE_HPP_EAN_11_27_2010
#define BOOST_PROTO_FUNCTIONAL_FUSION_REVERSE_HPP_EAN_11_27_2010
#include <boost/fusion/include/reverse.hpp>
#include <boost/proto/proto_fwd.hpp>
namespace boost { namespace proto { namespace functional
{
/// \brief A PolymorphicFunctionObject type that invokes the
/// \c fusion::reverse() algorithm on its argument.
///
/// A PolymorphicFunctionObject type that invokes the
/// \c fusion::reverse() algorithm on its argument. This is
/// useful for defining a CallableTransform like \c reverse(_)
/// which reverses the order of the children of a Proto
/// expression node.
struct reverse
{
BOOST_PROTO_CALLABLE()
template<typename Sig>
struct result;
template<typename This, typename Seq>
struct result<This(Seq)>
: result<This(Seq const &)>
{};
template<typename This, typename Seq>
struct result<This(Seq &)>
: fusion::result_of::reverse<Seq>
{};
template<typename Seq>
typename fusion::result_of::reverse<Seq>::type
operator ()(Seq &seq) const
{
// Work around a const-correctness issue in Fusion
typedef typename fusion::result_of::reverse<Seq>::type result_type;
return result_type(seq);
}
template<typename Seq>
typename fusion::result_of::reverse<Seq const>::type
operator ()(Seq const &seq) const
{
return fusion::reverse(seq);
}
};
}}}
#endif

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///////////////////////////////////////////////////////////////////////////////
/// \file range.hpp
/// Proto callables for things found in the boost range library
//
// Copyright 2012 Eric Niebler. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_PROTO_FUNCTIONAL_RANGE_HPP_EAN_27_08_2012
#define BOOST_PROTO_FUNCTIONAL_RANGE_HPP_EAN_27_08_2012
#include <boost/proto/functional/range/begin.hpp>
#include <boost/proto/functional/range/empty.hpp>
#include <boost/proto/functional/range/end.hpp>
#include <boost/proto/functional/range/rbegin.hpp>
#include <boost/proto/functional/range/rend.hpp>
#include <boost/proto/functional/range/size.hpp>
#endif

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///////////////////////////////////////////////////////////////////////////////
/// \file begin.hpp
/// Proto callables for boost::begin()
//
// Copyright 2012 Eric Niebler. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_PROTO_FUNCTIONAL_RANGE_BEGIN_HPP_EAN_27_08_2012
#define BOOST_PROTO_FUNCTIONAL_RANGE_BEGIN_HPP_EAN_27_08_2012
#include <boost/range/begin.hpp>
#include <boost/proto/proto_fwd.hpp>
namespace boost { namespace proto { namespace functional
{
// A PolymorphicFunctionObject that wraps boost::begin()
struct begin
{
BOOST_PROTO_CALLABLE()
template<typename Sig>
struct result;
template<typename This, typename Rng>
struct result<This(Rng)>
: boost::range_iterator<Rng const>
{};
template<typename This, typename Rng>
struct result<This(Rng &)>
: boost::range_iterator<Rng>
{};
template<typename Rng>
typename boost::range_iterator<Rng>::type operator()(Rng &rng) const
{
return boost::begin(rng);
}
template<typename Rng>
typename boost::range_iterator<Rng const>::type operator()(Rng const &rng) const
{
return boost::begin(rng);
}
};
}}}
#endif

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///////////////////////////////////////////////////////////////////////////////
/// \file empty.hpp
/// Proto callables for boost::empty()
//
// Copyright 2012 Eric Niebler. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_PROTO_FUNCTIONAL_RANGE_EMPTY_HPP_EAN_27_08_2012
#define BOOST_PROTO_FUNCTIONAL_RANGE_EMPTY_HPP_EAN_27_08_2012
#include <boost/range/empty.hpp>
#include <boost/proto/proto_fwd.hpp>
namespace boost { namespace proto { namespace functional
{
// A PolymorphicFunctionObject that wraps boost::empty()
struct empty
{
BOOST_PROTO_CALLABLE()
typedef bool result_type;
template<typename Rng>
bool operator()(Rng const &rng) const
{
return boost::empty(rng);
}
};
}}}
#endif

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///////////////////////////////////////////////////////////////////////////////
/// \file end.hpp
/// Proto callables for boost::end()
//
// Copyright 2012 Eric Niebler. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_PROTO_FUNCTIONAL_RANGE_END_HPP_EAN_27_08_2012
#define BOOST_PROTO_FUNCTIONAL_RANGE_END_HPP_EAN_27_08_2012
#include <boost/range/end.hpp>
#include <boost/proto/proto_fwd.hpp>
namespace boost { namespace proto { namespace functional
{
// A PolymorphicFunctionObject that wraps boost::end()
struct end
{
BOOST_PROTO_CALLABLE()
template<typename Sig>
struct result;
template<typename This, typename Rng>
struct result<This(Rng)>
: boost::range_iterator<Rng const>
{};
template<typename This, typename Rng>
struct result<This(Rng &)>
: boost::range_iterator<Rng>
{};
template<typename Rng>
typename boost::range_iterator<Rng>::type operator()(Rng &rng) const
{
return boost::end(rng);
}
template<typename Rng>
typename boost::range_iterator<Rng const>::type operator()(Rng const &rng) const
{
return boost::end(rng);
}
};
}}}
#endif

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///////////////////////////////////////////////////////////////////////////////
/// \file rbegin.hpp
/// Proto callables for boost::rbegin()
//
// Copyright 2012 Eric Niebler. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_PROTO_FUNCTIONAL_RANGE_RBEGIN_HPP_EAN_27_08_2012
#define BOOST_PROTO_FUNCTIONAL_RANGE_RBEGIN_HPP_EAN_27_08_2012
#include <boost/range/rbegin.hpp>
#include <boost/proto/proto_fwd.hpp>
namespace boost { namespace proto { namespace functional
{
// A PolymorphicFunctionObject that wraps boost::rbegin()
struct rbegin
{
BOOST_PROTO_CALLABLE()
template<typename Sig>
struct result;
template<typename This, typename Rng>
struct result<This(Rng)>
: boost::range_reverse_iterator<Rng const>
{};
template<typename This, typename Rng>
struct result<This(Rng &)>
: boost::range_reverse_iterator<Rng>
{};
template<typename Rng>
typename boost::range_reverse_iterator<Rng>::type operator()(Rng &rng) const
{
return boost::rbegin(rng);
}
template<typename Rng>
typename boost::range_reverse_iterator<Rng const>::type operator()(Rng const &rng) const
{
return boost::rbegin(rng);
}
};
}}}
#endif

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///////////////////////////////////////////////////////////////////////////////
/// \file rend.hpp
/// Proto callables for boost::rend()
//
// Copyright 2012 Eric Niebler. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_PROTO_FUNCTIONAL_RANGE_REND_HPP_EAN_27_08_2012
#define BOOST_PROTO_FUNCTIONAL_RANGE_REND_HPP_EAN_27_08_2012
#include <boost/range/rend.hpp>
#include <boost/proto/proto_fwd.hpp>
namespace boost { namespace proto { namespace functional
{
// A PolymorphicFunctionObject that wraps boost::rend()
struct rend
{
BOOST_PROTO_CALLABLE()
template<typename Sig>
struct result;
template<typename This, typename Rng>
struct result<This(Rng)>
: boost::range_reverse_iterator<Rng const>
{};
template<typename This, typename Rng>
struct result<This(Rng &)>
: boost::range_reverse_iterator<Rng>
{};
template<typename Rng>
typename boost::range_reverse_iterator<Rng>::type operator()(Rng &rng) const
{
return boost::rend(rng);
}
template<typename Rng>
typename boost::range_reverse_iterator<Rng const>::type operator()(Rng const &rng) const
{
return boost::rend(rng);
}
};
}}}
#endif

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///////////////////////////////////////////////////////////////////////////////
/// \file size.hpp
/// Proto callables for boost::size()
//
// Copyright 2012 Eric Niebler. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_PROTO_FUNCTIONAL_RANGE_SIZE_HPP_EAN_27_08_2012
#define BOOST_PROTO_FUNCTIONAL_RANGE_SIZE_HPP_EAN_27_08_2012
#include <boost/range/size.hpp>
#include <boost/proto/proto_fwd.hpp>
namespace boost { namespace proto { namespace functional
{
// A PolymorphicFunctionObject that wraps boost::size()
struct size
{
BOOST_PROTO_CALLABLE()
template<typename Sig>
struct result;
template<typename This, typename Rng>
struct result<This(Rng)>
: boost::range_size<Rng>
{};
template<typename This, typename Rng>
struct result<This(Rng &)>
: boost::range_size<Rng>
{};
template<typename Rng>
typename boost::range_size<Rng>::type operator()(Rng const &rng) const
{
return boost::size(rng);
}
};
}}}
#endif

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///////////////////////////////////////////////////////////////////////////////
/// \file std.hpp
/// Proto callables for things found in the std library
//
// Copyright 2010 Eric Niebler. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_PROTO_FUNCTIONAL_STD_HPP_EAN_11_27_2010
#define BOOST_PROTO_FUNCTIONAL_STD_HPP_EAN_11_27_2010
#include <boost/proto/functional/std/utility.hpp>
#include <boost/proto/functional/std/iterator.hpp>
#endif

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///////////////////////////////////////////////////////////////////////////////
/// \file iterator.hpp
/// Proto callables for std functions found in \<iterator\>
//
// Copyright 2012 Eric Niebler. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_PROTO_FUNCTIONAL_STD_ITERATOR_HPP_EAN_27_08_2012
#define BOOST_PROTO_FUNCTIONAL_STD_ITERATOR_HPP_EAN_27_08_2012
#include <iterator>
#include <boost/type_traits/remove_const.hpp>
#include <boost/type_traits/remove_reference.hpp>
#include <boost/proto/proto_fwd.hpp>
namespace boost { namespace proto { namespace functional
{
// A PolymorphicFunctionObject wrapping std::advance
struct advance
{
BOOST_PROTO_CALLABLE()
typedef void result_type;
template<typename InputIterator, typename Distance>
void operator()(InputIterator &x, Distance n) const
{
std::advance(x, n);
}
};
// A PolymorphicFunctionObject wrapping std::distance
struct distance
{
BOOST_PROTO_CALLABLE()
template<typename Sig>
struct result;
template<typename This, typename InputIter1, typename InputIter2>
struct result<This(InputIter1, InputIter2)>
{
typedef
typename std::iterator_traits<
typename boost::remove_const<
typename boost::remove_reference<InputIter1>::type
>::type
>::difference_type
type;
};
template<typename InputIterator>
typename std::iterator_traits<InputIterator>::difference_type
operator()(InputIterator first, InputIterator last) const
{
return std::distance(first, last);
}
};
// A PolymorphicFunctionObject wrapping std::next
struct next
{
BOOST_PROTO_CALLABLE()
template<typename Sig>
struct result;
template<typename This, typename ForwardIterator>
struct result<This(ForwardIterator)>
{
typedef
typename boost::remove_const<
typename boost::remove_reference<ForwardIterator>::type
>::type
type;
};
template<typename This, typename ForwardIterator, typename Distance>
struct result<This(ForwardIterator, Distance)>
{
typedef
typename boost::remove_const<
typename boost::remove_reference<ForwardIterator>::type
>::type
type;
};
template<typename ForwardIterator>
ForwardIterator operator()(ForwardIterator x) const
{
return std::advance(
x
, static_cast<typename std::iterator_traits<ForwardIterator>::difference_type>(1)
);
}
template<typename ForwardIterator>
ForwardIterator operator()(
ForwardIterator x
, typename std::iterator_traits<ForwardIterator>::difference_type n
) const
{
return std::advance(x, n);
}
};
// A PolymorphicFunctionObject wrapping std::prior
struct prior
{
BOOST_PROTO_CALLABLE()
template<typename Sig>
struct result;
template<typename This, typename BidirectionalIterator>
struct result<This(BidirectionalIterator)>
{
typedef
typename boost::remove_const<
typename boost::remove_reference<BidirectionalIterator>::type
>::type
type;
};
template<typename This, typename BidirectionalIterator, typename Distance>
struct result<This(BidirectionalIterator, Distance)>
{
typedef
typename boost::remove_const<
typename boost::remove_reference<BidirectionalIterator>::type
>::type
type;
};
template<typename BidirectionalIterator>
BidirectionalIterator operator()(BidirectionalIterator x) const
{
return std::advance(
x
, -static_cast<typename std::iterator_traits<BidirectionalIterator>::difference_type>(1)
);
}
template<typename BidirectionalIterator>
BidirectionalIterator operator()(
BidirectionalIterator x
, typename std::iterator_traits<BidirectionalIterator>::difference_type n
) const
{
return std::advance(x, -n);
}
};
}}}
#endif

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///////////////////////////////////////////////////////////////////////////////
/// \file utility.hpp
/// Proto callables for things found in the std \<utility\> header
//
// Copyright 2010 Eric Niebler. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_PROTO_FUNCTIONAL_STD_UTILITY_HPP_EAN_11_27_2010
#define BOOST_PROTO_FUNCTIONAL_STD_UTILITY_HPP_EAN_11_27_2010
#include <utility>
#include <boost/type_traits/remove_const.hpp>
#include <boost/type_traits/remove_reference.hpp>
#include <boost/proto/proto_fwd.hpp>
namespace boost { namespace proto { namespace functional
{
/// \brief A PolymorphicFunctionObject type that invokes the
/// \c std::make_pair() algorithm on its arguments.
///
/// A PolymorphicFunctionObject type that invokes the
/// \c std::make_pair() algorithm on its arguments.
struct make_pair
{
BOOST_PROTO_CALLABLE()
template<typename Sig>
struct result;
template<typename This, typename First, typename Second>
struct result<This(First, Second)>
{
typedef
std::pair<
typename remove_const<typename remove_reference<First>::type>::type
, typename remove_const<typename remove_reference<Second>::type>::type
>
type;
};
template<typename First, typename Second>
std::pair<First, Second> operator()(First const &first, Second const &second) const
{
return std::make_pair(first, second);
}
};
/// \brief A PolymorphicFunctionObject type that returns
/// the first element of a std::pair.
///
/// A PolymorphicFunctionObject type that returns
/// the first element of a std::pair..
struct first
{
BOOST_PROTO_CALLABLE()
template<typename Sig>
struct result;
template<typename This, typename Pair>
struct result<This(Pair)>
{
typedef typename Pair::first_type type;
};
template<typename This, typename Pair>
struct result<This(Pair &)>
{
typedef typename Pair::first_type &type;
};
template<typename This, typename Pair>
struct result<This(Pair const &)>
{
typedef typename Pair::first_type const &type;
};
template<typename Pair>
typename Pair::first_type &operator()(Pair &pair) const
{
return pair.first;
}
template<typename Pair>
typename Pair::first_type const &operator()(Pair const &pair) const
{
return pair.first;
}
};
/// \brief A PolymorphicFunctionObject type that returns
/// the second element of a std::pair.
///
/// A PolymorphicFunctionObject type that returns
/// the second element of a std::pair..
struct second
{
BOOST_PROTO_CALLABLE()
template<typename Sig>
struct result;
template<typename This, typename Pair>
struct result<This(Pair)>
{
typedef typename Pair::second_type type;
};
template<typename This, typename Pair>
struct result<This(Pair &)>
{
typedef typename Pair::second_type &type;
};
template<typename This, typename Pair>
struct result<This(Pair const &)>
{
typedef typename Pair::second_type const &type;
};
template<typename Pair>
typename Pair::second_type &operator()(Pair &pair) const
{
return pair.second;
}
template<typename Pair>
typename Pair::second_type const &operator()(Pair const &pair) const
{
return pair.second;
}
};
}}}
#endif