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core/	-	0755	rm
detail/	-	0755	rm
experimental/	-	0755	rm
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functional/	-	0755	rm
fwd/	-	0755	rm
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Edit: /usr/include/boost/hana/monadic_fold_left.hpp (4862B)

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

@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_MONADIC_FOLD_LEFT_HPP
#define BOOST_HANA_MONADIC_FOLD_LEFT_HPP

#include <boost/hana/fwd/monadic_fold_left.hpp>

#include <boost/hana/chain.hpp>
#include <boost/hana/concept/foldable.hpp>
#include <boost/hana/concept/monad.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/core/dispatch.hpp>
#include <boost/hana/detail/decay.hpp>
#include <boost/hana/fold_right.hpp>
#include <boost/hana/functional/curry.hpp>
#include <boost/hana/functional/partial.hpp>
#include <boost/hana/lift.hpp>

#include <type_traits>

BOOST_HANA_NAMESPACE_BEGIN
    //! @cond
    template <typename M>
    template <typename Xs, typename State, typename F>
    constexpr decltype(auto) monadic_fold_left_t<M>::operator()(Xs&& xs, State&& state, F&& f) const {
        using S = typename hana::tag_of<Xs>::type;
        using MonadicFoldLeft = BOOST_HANA_DISPATCH_IF(monadic_fold_left_impl<S>,
            hana::Foldable<S>::value
        );

#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
        static_assert(hana::Monad<M>::value,
        "hana::monadic_fold_left<M> requires 'M' to be a Monad");

static_assert(hana::Foldable<S>::value,
        "hana::monadic_fold_left<M>(xs, state, f) requires 'xs' to be Foldable");
    #endif

return MonadicFoldLeft::template apply<M>(static_cast<Xs&&>(xs),
                                                  static_cast<State&&>(state),
                                                  static_cast<F&&>(f));
    }
    //! @endcond

//! @cond
    template <typename M>
    template <typename Xs, typename F>
    constexpr decltype(auto) monadic_fold_left_t<M>::operator()(Xs&& xs, F&& f) const {
        using S = typename hana::tag_of<Xs>::type;
        using MonadicFoldLeft = BOOST_HANA_DISPATCH_IF(monadic_fold_left_impl<S>,
            hana::Foldable<S>::value
        );

#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
        static_assert(hana::Monad<M>::value,
        "hana::monadic_fold_left<M> requires 'M' to be a Monad");

static_assert(hana::Foldable<S>::value,
        "hana::monadic_fold_left<M>(xs, f) requires 'xs' to be Foldable");
    #endif

return MonadicFoldLeft::template apply<M>(static_cast<Xs&&>(xs),
                                                  static_cast<F&&>(f));
    }
    //! @endcond

namespace detail {
        struct foldlM_helper {
            template <typename F, typename X, typename K, typename Z>
            constexpr decltype(auto) operator()(F&& f, X&& x, K&& k, Z&& z) const {
                return hana::chain(
                    static_cast<F&&>(f)(
                        static_cast<Z&&>(z),
                        static_cast<X&&>(x)
                    ),
                    static_cast<K&&>(k)
                );
            }
        };

template <typename End, typename M, typename F>
        struct monadic_foldl1_helper {
            F f;
            template <typename X, typename Y>
            constexpr decltype(auto) operator()(X&& x, Y&& y) const
            { return f(static_cast<X&&>(x), static_cast<Y&&>(y)); }
            template <typename Y>
            constexpr decltype(auto) operator()(End, Y&& y) const
            { return hana::lift<M>(static_cast<Y&&>(y)); }
        };
    }

template <typename T, bool condition>
    struct monadic_fold_left_impl<T, when<condition>> : default_ {
        // with state
        template <typename M, typename Xs, typename S, typename F>
        static constexpr decltype(auto) apply(Xs&& xs, S&& s, F&& f) {
            return hana::fold_right(
                static_cast<Xs&&>(xs),
                hana::lift<M>,
                hana::curry<3>(hana::partial(
                    detail::foldlM_helper{}, static_cast<F&&>(f)
                ))
            )(static_cast<S&&>(s));
        }

// without state
        template <typename M, typename Xs, typename F>
        static constexpr decltype(auto) apply(Xs&& xs, F&& f) {
            struct end { };
            using G = detail::monadic_foldl1_helper<end, M, typename detail::decay<F>::type>;
            decltype(auto) result = hana::monadic_fold_left<M>(
                static_cast<Xs&&>(xs),
                end{},
                G{static_cast<F&&>(f)}
            );

static_assert(!std::is_same<
                std::remove_reference_t<decltype(result)>,
                decltype(hana::lift<M>(end{}))
            >{},
            "hana::monadic_fold_left<M>(xs, f) requires 'xs' to be non-empty");
            return result;
        }
    };
BOOST_HANA_NAMESPACE_END

#endif // !BOOST_HANA_MONADIC_FOLD_LEFT_HPP

/*! @file Defines `boost::hana::monadic_fold_left`. @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_MONADIC_FOLD_LEFT_HPP #define BOOST_HANA_MONADIC_FOLD_LEFT_HPP #include #include #include #include #include #include #include #include #include #include #include #include BOOST_HANA_NAMESPACE_BEGIN //! @cond template template constexpr decltype(auto) monadic_fold_left_t::operator()(Xs&& xs, State&& state, F&& f) const { using S = typename hana::tag_of::type; using MonadicFoldLeft = BOOST_HANA_DISPATCH_IF(monadic_fold_left_impl, hana::Foldable::value ); #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS static_assert(hana::Monad::value, "hana::monadic_fold_left requires 'M' to be a Monad"); static_assert(hana::Foldable::value, "hana::monadic_fold_left(xs, state, f) requires 'xs' to be Foldable"); #endif return MonadicFoldLeft::template apply(static_cast(xs), static_cast(state), static_cast(f)); } //! @endcond //! @cond template template constexpr decltype(auto) monadic_fold_left_t::operator()(Xs&& xs, F&& f) const { using S = typename hana::tag_of::type; using MonadicFoldLeft = BOOST_HANA_DISPATCH_IF(monadic_fold_left_impl, hana::Foldable::value ); #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS static_assert(hana::Monad::value, "hana::monadic_fold_left requires 'M' to be a Monad"); static_assert(hana::Foldable::value, "hana::monadic_fold_left(xs, f) requires 'xs' to be Foldable"); #endif return MonadicFoldLeft::template apply(static_cast(xs), static_cast(f)); } //! @endcond namespace detail { struct foldlM_helper { template constexpr decltype(auto) operator()(F&& f, X&& x, K&& k, Z&& z) const { return hana::chain( static_cast(f)( static_cast(z), static_cast(x) ), static_cast(k) ); } }; template struct monadic_foldl1_helper { F f; template constexpr decltype(auto) operator()(X&& x, Y&& y) const { return f(static_cast(x), static_cast(y)); } template constexpr decltype(auto) operator()(End, Y&& y) const { return hana::lift(static_cast(y)); } }; } template struct monadic_fold_left_impl> : default_ { // with state template static constexpr decltype(auto) apply(Xs&& xs, S&& s, F&& f) { return hana::fold_right( static_cast(xs), hana::lift, hana::curry<3>(hana::partial( detail::foldlM_helper{}, static_cast(f) )) )(static_cast(s)); } // without state template static constexpr decltype(auto) apply(Xs&& xs, F&& f) { struct end { }; using G = detail::monadic_foldl1_helper::type>; decltype(auto) result = hana::monadic_fold_left( static_cast(xs), end{}, G{static_cast(f)} ); static_assert(!std::is_same< std::remove_reference_t, decltype(hana::lift(end{})) >{}, "hana::monadic_fold_left(xs, f) requires 'xs' to be non-empty"); return result; } }; BOOST_HANA_NAMESPACE_END #endif // !BOOST_HANA_MONADIC_FOLD_LEFT_HPP