FM / hana

/usr/include/boost/hana

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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integral_constant.hpp	389	0644	edit dl rm
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zip_with.hpp	2292	0644	edit dl rm

Edit: /usr/include/boost/hana/index_if.hpp (3485B)

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

@copyright Louis Dionne 2013-2017
@copyright Jason Rice 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_INDEX_IF_HPP
#define BOOST_HANA_INDEX_IF_HPP

#include <boost/hana/concept/foldable.hpp>
#include <boost/hana/concept/iterable.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/detail/decay.hpp>
#include <boost/hana/detail/index_if.hpp>
#include <boost/hana/fwd/at.hpp>
#include <boost/hana/fwd/basic_tuple.hpp>
#include <boost/hana/fwd/index_if.hpp>
#include <boost/hana/integral_constant.hpp>
#include <boost/hana/length.hpp>
#include <boost/hana/optional.hpp>

#include <cstddef>
#include <utility>

BOOST_HANA_NAMESPACE_BEGIN
    //! @cond
    template <typename Xs, typename Pred>
    constexpr auto index_if_t::operator()(Xs&& xs, Pred&& pred) const {
        using S = typename hana::tag_of<Xs>::type;
        using IndexIf = BOOST_HANA_DISPATCH_IF(index_if_impl<S>,
            hana::Iterable<S>::value
        );

#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
        static_assert(hana::Iterable<S>::value,
        "hana::index_if(xs, pred) requires 'xs' to be a Iterable");
    #endif

return IndexIf::apply(static_cast<Xs&&>(xs), static_cast<Pred&&>(pred));
    }
    //! @endcond

namespace detail {
        template <std::size_t i, std::size_t N, bool Done>
        struct iterate_while;

template <std::size_t i, std::size_t N>
        struct iterate_while<i, N, false> {
            template <typename Xs, typename Pred>
            using f = typename iterate_while<i + 1, N,
                static_cast<bool>(detail::decay<decltype(
                    std::declval<Pred>()(
                      hana::at(std::declval<Xs>(), hana::size_c<i>)))>::type::value)
            >::template f<Xs, Pred>;
        };

template <std::size_t N>
        struct iterate_while<N, N, false> {
            template <typename Xs, typename Pred>
            using f = hana::optional<>;
        };

template <std::size_t i, std::size_t N>
        struct iterate_while<i, N, true> {
            template <typename Xs, typename Pred>
            using f = hana::optional<hana::size_t<i - 1>>;
        };
    }

template <typename Tag>
    struct index_if_impl<Tag, when<Foldable<Tag>::value>> {
        template <typename Xs, typename Pred>
        static constexpr auto apply(Xs const& xs, Pred const&)
            -> typename detail::iterate_while<0,
                decltype(hana::length(xs))::value, false>
                    ::template f<Xs, Pred>
        { return {}; }
    };

template <typename It>
    struct index_if_impl<It, when<!Foldable<It>::value>> {
        template <typename Xs, typename Pred>
        static constexpr auto apply(Xs const&, Pred const&)
            -> typename detail::iterate_while<0,
                static_cast<std::size_t>(-1), false>
                    ::template f<Xs, Pred>
        { return {}; }
    };

// basic_tuple is implemented here to solve circular dependency issues.
    template <>
    struct index_if_impl<basic_tuple_tag> {
        template <typename ...Xs, typename Pred>
        static constexpr auto apply(basic_tuple<Xs...> const&, Pred const&)
            -> typename detail::index_if<Pred, Xs...>::type
        { return {}; }
    };
BOOST_HANA_NAMESPACE_END

#endif // !BOOST_HANA_INDEX_IF_HPP

/*! @file Defines `boost::hana::index_if`. @copyright Louis Dionne 2013-2017 @copyright Jason Rice 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_INDEX_IF_HPP #define BOOST_HANA_INDEX_IF_HPP #include #include #include #include #include #include #include #include #include #include #include #include #include BOOST_HANA_NAMESPACE_BEGIN //! @cond template constexpr auto index_if_t::operator()(Xs&& xs, Pred&& pred) const { using S = typename hana::tag_of::type; using IndexIf = BOOST_HANA_DISPATCH_IF(index_if_impl, hana::Iterable::value ); #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS static_assert(hana::Iterable::value, "hana::index_if(xs, pred) requires 'xs' to be a Iterable"); #endif return IndexIf::apply(static_cast(xs), static_cast(pred)); } //! @endcond namespace detail { template struct iterate_while; template struct iterate_while { template using f = typename iterate_while(detail::decay()( hana::at(std::declval(), hana::size_c)))>::type::value) >::template f; }; template struct iterate_while { template using f = hana::optional<>; }; template struct iterate_while { template using f = hana::optional>; }; } template struct index_if_impl::value>> { template static constexpr auto apply(Xs const& xs, Pred const&) -> typename detail::iterate_while<0, decltype(hana::length(xs))::value, false> ::template f { return {}; } }; template struct index_if_impl::value>> { template static constexpr auto apply(Xs const&, Pred const&) -> typename detail::iterate_while<0, static_cast(-1), false> ::template f { return {}; } }; // basic_tuple is implemented here to solve circular dependency issues. template <> struct index_if_impl { template static constexpr auto apply(basic_tuple const&, Pred const&) -> typename detail::index_if::type { return {}; } }; BOOST_HANA_NAMESPACE_END #endif // !BOOST_HANA_INDEX_IF_HPP