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Name	Size	Mode	Actions
concept/	-	0755	rm
core/	-	0755	rm
detail/	-	0755	rm
experimental/	-	0755	rm
ext/	-	0755	rm
functional/	-	0755	rm
fwd/	-	0755	rm
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Edit: /usr/include/boost/hana/lazy.hpp (7947B)

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

@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_LAZY_HPP
#define BOOST_HANA_LAZY_HPP

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

#include <boost/hana/basic_tuple.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/core/make.hpp>
#include <boost/hana/detail/decay.hpp>
#include <boost/hana/detail/operators/adl.hpp>
#include <boost/hana/detail/operators/monad.hpp>
#include <boost/hana/functional/apply.hpp>
#include <boost/hana/functional/compose.hpp>
#include <boost/hana/functional/on.hpp>
#include <boost/hana/fwd/ap.hpp>
#include <boost/hana/fwd/duplicate.hpp>
#include <boost/hana/fwd/eval.hpp>
#include <boost/hana/fwd/extend.hpp>
#include <boost/hana/fwd/extract.hpp>
#include <boost/hana/fwd/flatten.hpp>
#include <boost/hana/fwd/lift.hpp>
#include <boost/hana/fwd/transform.hpp>

#include <cstddef>
#include <type_traits>
#include <utility>

BOOST_HANA_NAMESPACE_BEGIN
    //////////////////////////////////////////////////////////////////////////
    // lazy
    //////////////////////////////////////////////////////////////////////////
    template <typename Indices, typename F, typename ...Args>
    struct lazy_apply_t;

namespace detail { struct lazy_secret { }; }

template <std::size_t ...n, typename F, typename ...Args>
    struct lazy_apply_t<std::index_sequence<n...>, F, Args...>
        : detail::operators::adl<>
    {
        template <typename ...T>
        constexpr lazy_apply_t(detail::lazy_secret, T&& ...t)
            : storage_{static_cast<T&&>(t)...}
        { }

basic_tuple<F, Args...> storage_;
        using hana_tag = lazy_tag;
    };

template <typename X>
    struct lazy_value_t : detail::operators::adl<> {
        template <typename Y>
        constexpr lazy_value_t(detail::lazy_secret, Y&& y)
            : storage_{static_cast<Y&&>(y)}
        { }

basic_tuple<X> storage_;
        using hana_tag = lazy_tag;

// If this is called, we assume that `X` is in fact a function.
        template <typename ...Args>
        constexpr lazy_apply_t<
            std::make_index_sequence<sizeof...(Args)>,
            X, typename detail::decay<Args>::type...
        > operator()(Args&& ...args) const& {
            return {detail::lazy_secret{},
                    hana::at_c<0>(storage_), static_cast<Args&&>(args)...};
        }

template <typename ...Args>
        constexpr lazy_apply_t<
            std::make_index_sequence<sizeof...(Args)>,
            X, typename detail::decay<Args>::type...
        > operator()(Args&& ...args) && {
            return {detail::lazy_secret{},
                static_cast<X&&>(hana::at_c<0>(storage_)),
                static_cast<Args&&>(args)...
            };
        }
    };

//////////////////////////////////////////////////////////////////////////
    // make<lazy_tag>
    //////////////////////////////////////////////////////////////////////////
    template <>
    struct make_impl<lazy_tag> {
        template <typename X>
        static constexpr lazy_value_t<typename detail::decay<X>::type> apply(X&& x) {
            return {detail::lazy_secret{}, static_cast<X&&>(x)};
        }
    };

//////////////////////////////////////////////////////////////////////////
    // Operators
    //////////////////////////////////////////////////////////////////////////
    namespace detail {
        template <>
        struct monad_operators<lazy_tag> { static constexpr bool value = true; };
    }

//////////////////////////////////////////////////////////////////////////
    // eval for lazy_tag
    //////////////////////////////////////////////////////////////////////////
    template <>
    struct eval_impl<lazy_tag> {
        // lazy_apply_t
        template <std::size_t ...n, typename F, typename ...Args>
        static constexpr decltype(auto)
        apply(lazy_apply_t<std::index_sequence<n...>, F, Args...> const& expr) {
            return hana::at_c<0>(expr.storage_)(
                hana::at_c<n+1>(expr.storage_)...
            );
        }

template <std::size_t ...n, typename F, typename ...Args>
        static constexpr decltype(auto)
        apply(lazy_apply_t<std::index_sequence<n...>, F, Args...>& expr) {
            return hana::at_c<0>(expr.storage_)(
                hana::at_c<n+1>(expr.storage_)...
            );
        }

template <std::size_t ...n, typename F, typename ...Args>
        static constexpr decltype(auto)
        apply(lazy_apply_t<std::index_sequence<n...>, F, Args...>&& expr) {
            return static_cast<F&&>(hana::at_c<0>(expr.storage_))(
                static_cast<Args&&>(hana::at_c<n+1>(expr.storage_))...
            );
        }

// lazy_value_t
        template <typename X>
        static constexpr X const& apply(lazy_value_t<X> const& expr)
        { return hana::at_c<0>(expr.storage_); }

template <typename X>
        static constexpr X& apply(lazy_value_t<X>& expr)
        { return hana::at_c<0>(expr.storage_); }

template <typename X>
        static constexpr X apply(lazy_value_t<X>&& expr)
        { return static_cast<X&&>(hana::at_c<0>(expr.storage_)); }
    };

//////////////////////////////////////////////////////////////////////////
    // Functor
    //////////////////////////////////////////////////////////////////////////
    template <>
    struct transform_impl<lazy_tag> {
        template <typename Expr, typename F>
        static constexpr auto apply(Expr&& expr, F&& f) {
            return hana::make_lazy(hana::compose(static_cast<F&&>(f), hana::eval))(
                static_cast<Expr&&>(expr)
            );
        }
    };

//////////////////////////////////////////////////////////////////////////
    // Applicative
    //////////////////////////////////////////////////////////////////////////
    template <>
    struct lift_impl<lazy_tag> {
        template <typename X>
        static constexpr lazy_value_t<typename detail::decay<X>::type>
        apply(X&& x) {
            return {detail::lazy_secret{}, static_cast<X&&>(x)};
        }
    };

template <>
    struct ap_impl<lazy_tag> {
        template <typename F, typename X>
        static constexpr decltype(auto) apply(F&& f, X&& x) {
            return hana::make_lazy(hana::on(hana::apply, hana::eval))(
                static_cast<F&&>(f), static_cast<X&&>(x)
            );
        }
    };

//////////////////////////////////////////////////////////////////////////
    // Monad
    //////////////////////////////////////////////////////////////////////////
    template <>
    struct flatten_impl<lazy_tag> {
        template <typename Expr>
        static constexpr decltype(auto) apply(Expr&& expr) {
            return hana::make_lazy(hana::compose(hana::eval, hana::eval))(
                static_cast<Expr&&>(expr)
            );
        }
    };

//////////////////////////////////////////////////////////////////////////
    // Comonad
    //////////////////////////////////////////////////////////////////////////
    template <>
    struct extract_impl<lazy_tag> {
        template <typename Expr>
        static constexpr decltype(auto) apply(Expr&& expr)
        { return hana::eval(static_cast<Expr&&>(expr)); }
    };

template <>
    struct duplicate_impl<lazy_tag> {
        template <typename Expr>
        static constexpr decltype(auto) apply(Expr&& expr)
        { return hana::make_lazy(static_cast<Expr&&>(expr)); }
    };

template <>
    struct extend_impl<lazy_tag> {
        template <typename Expr, typename F>
        static constexpr decltype(auto) apply(Expr&& expr, F&& f) {
            return hana::make_lazy(static_cast<F&&>(f))(static_cast<Expr&&>(expr));
        }
    };
BOOST_HANA_NAMESPACE_END

#endif // !BOOST_HANA_LAZY_HPP

/*! @file Defines `boost::hana::lazy`. @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_LAZY_HPP #define BOOST_HANA_LAZY_HPP #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include BOOST_HANA_NAMESPACE_BEGIN ////////////////////////////////////////////////////////////////////////// // lazy ////////////////////////////////////////////////////////////////////////// template struct lazy_apply_t; namespace detail { struct lazy_secret { }; } template struct lazy_apply_t, F, Args...> : detail::operators::adl<> { template constexpr lazy_apply_t(detail::lazy_secret, T&& ...t) : storage_{static_cast(t)...} { } basic_tuple storage_; using hana_tag = lazy_tag; }; template struct lazy_value_t : detail::operators::adl<> { template constexpr lazy_value_t(detail::lazy_secret, Y&& y) : storage_{static_cast(y)} { } basic_tuple storage_; using hana_tag = lazy_tag; // If this is called, we assume that `X` is in fact a function. template constexpr lazy_apply_t< std::make_index_sequence, X, typename detail::decay::type... > operator()(Args&& ...args) const& { return {detail::lazy_secret{}, hana::at_c<0>(storage_), static_cast(args)...}; } template constexpr lazy_apply_t< std::make_index_sequence, X, typename detail::decay::type... > operator()(Args&& ...args) && { return {detail::lazy_secret{}, static_cast(hana::at_c<0>(storage_)), static_cast(args)... }; } }; ////////////////////////////////////////////////////////////////////////// // make ////////////////////////////////////////////////////////////////////////// template <> struct make_impl { template static constexpr lazy_value_t::type> apply(X&& x) { return {detail::lazy_secret{}, static_cast(x)}; } }; ////////////////////////////////////////////////////////////////////////// // Operators ////////////////////////////////////////////////////////////////////////// namespace detail { template <> struct monad_operators { static constexpr bool value = true; }; } ////////////////////////////////////////////////////////////////////////// // eval for lazy_tag ////////////////////////////////////////////////////////////////////////// template <> struct eval_impl { // lazy_apply_t template static constexpr decltype(auto) apply(lazy_apply_t, F, Args...> const& expr) { return hana::at_c<0>(expr.storage_)( hana::at_c(expr.storage_)... ); } template static constexpr decltype(auto) apply(lazy_apply_t, F, Args...>& expr) { return hana::at_c<0>(expr.storage_)( hana::at_c(expr.storage_)... ); } template static constexpr decltype(auto) apply(lazy_apply_t, F, Args...>&& expr) { return static_cast(hana::at_c<0>(expr.storage_))( static_cast(hana::at_c(expr.storage_))... ); } // lazy_value_t template static constexpr X const& apply(lazy_value_t const& expr) { return hana::at_c<0>(expr.storage_); } template static constexpr X& apply(lazy_value_t& expr) { return hana::at_c<0>(expr.storage_); } template static constexpr X apply(lazy_value_t&& expr) { return static_cast(hana::at_c<0>(expr.storage_)); } }; ////////////////////////////////////////////////////////////////////////// // Functor ////////////////////////////////////////////////////////////////////////// template <> struct transform_impl { template static constexpr auto apply(Expr&& expr, F&& f) { return hana::make_lazy(hana::compose(static_cast(f), hana::eval))( static_cast(expr) ); } }; ////////////////////////////////////////////////////////////////////////// // Applicative ////////////////////////////////////////////////////////////////////////// template <> struct lift_impl { template static constexpr lazy_value_t::type> apply(X&& x) { return {detail::lazy_secret{}, static_cast(x)}; } }; template <> struct ap_impl { template static constexpr decltype(auto) apply(F&& f, X&& x) { return hana::make_lazy(hana::on(hana::apply, hana::eval))( static_cast(f), static_cast(x) ); } }; ////////////////////////////////////////////////////////////////////////// // Monad ////////////////////////////////////////////////////////////////////////// template <> struct flatten_impl { template static constexpr decltype(auto) apply(Expr&& expr) { return hana::make_lazy(hana::compose(hana::eval, hana::eval))( static_cast(expr) ); } }; ////////////////////////////////////////////////////////////////////////// // Comonad ////////////////////////////////////////////////////////////////////////// template <> struct extract_impl { template static constexpr decltype(auto) apply(Expr&& expr) { return hana::eval(static_cast(expr)); } }; template <> struct duplicate_impl { template static constexpr decltype(auto) apply(Expr&& expr) { return hana::make_lazy(static_cast(expr)); } }; template <> struct extend_impl { template static constexpr decltype(auto) apply(Expr&& expr, F&& f) { return hana::make_lazy(static_cast(f))(static_cast(expr)); } }; BOOST_HANA_NAMESPACE_END #endif // !BOOST_HANA_LAZY_HPP