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
accessors.hpp	1513	0644	edit dl rm
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at.hpp	1659	0644	edit dl rm
at_key.hpp	3009	0644	edit dl rm
back.hpp	1534	0644	edit dl rm
basic_tuple.hpp	9455	0644	edit dl rm
bool.hpp	9747	0644	edit dl rm
cartesian_product.hpp	3860	0644	edit dl rm
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integral_constant.hpp	389	0644	edit dl rm
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keys.hpp	1307	0644	edit dl rm
lazy.hpp	7947	0644	edit dl rm
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zip_with.hpp	2292	0644	edit dl rm

Edit: /usr/include/boost/hana/at_key.hpp (3009B)

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

@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_AT_KEY_HPP
#define BOOST_HANA_AT_KEY_HPP

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

#include <boost/hana/accessors.hpp>
#include <boost/hana/at.hpp>
#include <boost/hana/concept/searchable.hpp>
#include <boost/hana/concept/struct.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/core/dispatch.hpp>
#include <boost/hana/detail/decay.hpp>
#include <boost/hana/equal.hpp>
#include <boost/hana/find.hpp>
#include <boost/hana/find_if.hpp>
#include <boost/hana/first.hpp>
#include <boost/hana/functional/on.hpp>
#include <boost/hana/index_if.hpp>
#include <boost/hana/length.hpp>
#include <boost/hana/optional.hpp>
#include <boost/hana/second.hpp>

#include <cstddef>
#include <utility>

BOOST_HANA_NAMESPACE_BEGIN
    //! @cond
    template <typename Xs, typename Key>
    constexpr decltype(auto) at_key_t::operator()(Xs&& xs, Key const& key) const {
        using S = typename hana::tag_of<Xs>::type;
        using AtKey = BOOST_HANA_DISPATCH_IF(at_key_impl<S>,
            hana::Searchable<S>::value
        );

#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
        static_assert(hana::Searchable<S>::value,
        "hana::at_key(xs, key) requires 'xs' to be Searchable");
    #endif

return AtKey::apply(static_cast<Xs&&>(xs), key);
    }
    //! @endcond

template <typename S, bool condition>
    struct at_key_impl<S, when<condition>> : default_ {
        template <typename Xs, typename Key>
        static constexpr auto apply(Xs&& xs, Key const& key) {
            return hana::find(static_cast<Xs&&>(xs), key).value();
        }
    };

namespace at_key_detail {
        template <typename T>
        struct equal_to {
            T const& t;
            template <typename U>
            constexpr auto operator()(U const& u) const {
                return hana::equal(t, u);
            }
        };
    }

template <typename S>
    struct at_key_impl<S, when<hana::Sequence<S>::value>> {
        template <typename Xs, typename Key>
        static constexpr decltype(auto) apply(Xs&& xs, Key const& key) {
            using Result = decltype(hana::index_if(
                static_cast<Xs&&>(xs), at_key_detail::equal_to<Key>{key}));

return hana::at(static_cast<Xs&&>(xs), Result{}.value());
        }
    };

template <typename S>
    struct at_key_impl<S, when<hana::Struct<S>::value>> {
        template <typename X, typename Key>
        static constexpr decltype(auto) apply(X&& x, Key const& key) {
            auto accessor = hana::second(*hana::find_if(hana::accessors<S>(),
                hana::equal.to(key) ^hana::on^ hana::first
            ));
            return accessor(static_cast<X&&>(x));
        }
    };
BOOST_HANA_NAMESPACE_END

#endif // !BOOST_HANA_AT_KEY_HPP

/*! @file Defines `boost::hana::at_key`. @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_AT_KEY_HPP #define BOOST_HANA_AT_KEY_HPP #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include BOOST_HANA_NAMESPACE_BEGIN //! @cond template constexpr decltype(auto) at_key_t::operator()(Xs&& xs, Key const& key) const { using S = typename hana::tag_of::type; using AtKey = BOOST_HANA_DISPATCH_IF(at_key_impl, hana::Searchable::value ); #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS static_assert(hana::Searchable::value, "hana::at_key(xs, key) requires 'xs' to be Searchable"); #endif return AtKey::apply(static_cast(xs), key); } //! @endcond template struct at_key_impl> : default_ { template static constexpr auto apply(Xs&& xs, Key const& key) { return hana::find(static_cast(xs), key).value(); } }; namespace at_key_detail { template struct equal_to { T const& t; template constexpr auto operator()(U const& u) const { return hana::equal(t, u); } }; } template struct at_key_impl::value>> { template static constexpr decltype(auto) apply(Xs&& xs, Key const& key) { using Result = decltype(hana::index_if( static_cast(xs), at_key_detail::equal_to{key})); return hana::at(static_cast(xs), Result{}.value()); } }; template struct at_key_impl::value>> { template static constexpr decltype(auto) apply(X&& x, Key const& key) { auto accessor = hana::second(*hana::find_if(hana::accessors~~(), hana::equal.to(key) ^hana::on^ hana::first )); return accessor(static_cast(x)); } }; BOOST_HANA_NAMESPACE_END #endif // !BOOST_HANA_AT_KEY_HPP~~