FM / functional

/usr/include/boost/hana/functional

Name	Size	Mode	Actions
always.hpp	1790	0644	edit dl rm
apply.hpp	2940	0644	edit dl rm
arg.hpp	5116	0644	edit dl rm
capture.hpp	3498	0644	edit dl rm
compose.hpp	3393	0644	edit dl rm
curry.hpp	5716	0644	edit dl rm
demux.hpp	9550	0644	edit dl rm
fix.hpp	2758	0644	edit dl rm
flip.hpp	2071	0644	edit dl rm
id.hpp	905	0644	edit dl rm
infix.hpp	6462	0644	edit dl rm
iterate.hpp	6254	0644	edit dl rm
lockstep.hpp	3610	0644	edit dl rm
on.hpp	2291	0644	edit dl rm
overload.hpp	2681	0644	edit dl rm
overload_linearly.hpp	3707	0644	edit dl rm
partial.hpp	3237	0644	edit dl rm
placeholder.hpp	12985	0644	edit dl rm
reverse_partial.hpp	3269	0644	edit dl rm

Edit: /usr/include/boost/hana/functional/lockstep.hpp (3610B)

/*!
@file
Defines `boost::hana::lockstep`.

@copyright Louis Dionne 2013-2017
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
 */

#ifndef BOOST_HANA_FUNCTIONAL_LOCKSTEP_HPP
#define BOOST_HANA_FUNCTIONAL_LOCKSTEP_HPP

#include <boost/hana/basic_tuple.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/detail/decay.hpp>

#include <cstddef>
#include <utility>

BOOST_HANA_NAMESPACE_BEGIN
    //! @ingroup group-functional
    //! Invoke a function with the result of invoking other functions on its
    //! arguments, in lockstep.
    //!
    //! Specifically, `lockstep(f)(g1, ..., gN)` is a function such that
    //! @code
    //!     lockstep(f)(g1, ..., gN)(x1, ..., xN) == f(g1(x1), ..., gN(xN))
    //! @endcode
    //!
    //! Since each `g` is invoked on its corresponding argument in lockstep,
    //! the number of arguments must match the number of `g`s.
    //!
    //!
    //! Example
    //! -------
    //! @include example/functional/lockstep.cpp
#ifdef BOOST_HANA_DOXYGEN_INVOKED
    constexpr auto lockstep = [](auto&& f, auto&& ...g) {
        return [perfect-capture](auto&& ...x) -> decltype(auto) {
            return forwarded(f)(forwarded(g)(forwarded(x))...);
        };
    };
#else
    template <typename Indices, typename F, typename ...G>
    struct lockstep_t;

template <typename F>
    struct pre_lockstep_t;

struct make_pre_lockstep_t {
        struct secret { };
        template <typename F>
        constexpr pre_lockstep_t<typename detail::decay<F>::type> operator()(F&& f) const {
            return {static_cast<F&&>(f)};
        }
    };

template <std::size_t ...n, typename F, typename ...G>
    struct lockstep_t<std::index_sequence<n...>, F, G...> {
        template <typename ...T>
        constexpr lockstep_t(make_pre_lockstep_t::secret, T&& ...t)
            : storage_{static_cast<T&&>(t)...}
        { }

basic_tuple<F, G...> storage_;

template <typename ...X>
        constexpr decltype(auto) operator()(X&& ...x) const& {
            return hana::at_c<0>(storage_)(
                hana::at_c<n+1>(storage_)(static_cast<X&&>(x))...
            );
        }

template <typename ...X>
        constexpr decltype(auto) operator()(X&& ...x) & {
            return hana::at_c<0>(storage_)(
                hana::at_c<n+1>(storage_)(static_cast<X&&>(x))...
            );
        }

template <typename ...X>
        constexpr decltype(auto) operator()(X&& ...x) && {
            return static_cast<F&&>(hana::at_c<0>(storage_))(
                static_cast<G&&>(hana::at_c<n+1>(storage_))(static_cast<X&&>(x))...
            );
        }
    };

template <typename F>
    struct pre_lockstep_t {
        F f;

template <typename ...G>
        constexpr lockstep_t<std::make_index_sequence<sizeof...(G)>, F,
                             typename detail::decay<G>::type...>
        operator()(G&& ...g) const& {
            return {make_pre_lockstep_t::secret{}, this->f, static_cast<G&&>(g)...};
        }

template <typename ...G>
        constexpr lockstep_t<std::make_index_sequence<sizeof...(G)>, F,
                             typename detail::decay<G>::type...>
        operator()(G&& ...g) && {
            return {make_pre_lockstep_t::secret{}, static_cast<F&&>(this->f),
                                                   static_cast<G&&>(g)...};
        }
    };

constexpr make_pre_lockstep_t lockstep{};
#endif
BOOST_HANA_NAMESPACE_END

#endif // !BOOST_HANA_FUNCTIONAL_LOCKSTEP_HPP

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