updated boost on windows
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@@ -3,6 +3,7 @@
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Defines `boost::hana::find_if`.
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@copyright Louis Dionne 2013-2017
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@copyright Jason Rice 2017
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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*/
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@@ -17,19 +18,12 @@ Distributed under the Boost Software License, Version 1.0.
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#include <boost/hana/bool.hpp>
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#include <boost/hana/concept/iterable.hpp>
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#include <boost/hana/concept/searchable.hpp>
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#include <boost/hana/concept/sequence.hpp>
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#include <boost/hana/concept/struct.hpp>
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#include <boost/hana/config.hpp>
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#include <boost/hana/core/dispatch.hpp>
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#include <boost/hana/detail/decay.hpp>
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#include <boost/hana/drop_while.hpp>
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#include <boost/hana/first.hpp>
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#include <boost/hana/front.hpp>
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#include <boost/hana/functional/compose.hpp>
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#include <boost/hana/is_empty.hpp>
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#include <boost/hana/length.hpp>
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#include <boost/hana/not.hpp>
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#include <boost/hana/optional.hpp>
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#include <boost/hana/index_if.hpp>
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#include <boost/hana/second.hpp>
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#include <boost/hana/transform.hpp>
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@@ -62,68 +56,26 @@ BOOST_HANA_NAMESPACE_BEGIN
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};
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namespace detail {
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template <typename Xs, typename Pred, std::size_t i, std::size_t N, bool Done>
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struct advance_until;
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template <typename Xs>
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struct partial_at {
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Xs const& xs;
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template <typename Xs, typename Pred, std::size_t i, std::size_t N>
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struct advance_until<Xs, Pred, i, N, false>
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: advance_until<Xs, Pred, i + 1, N, static_cast<bool>(detail::decay<decltype(
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std::declval<Pred>()(hana::at_c<i>(std::declval<Xs>()))
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)>::type::value)>
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{ };
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template <typename Xs, typename Pred, std::size_t N>
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struct advance_until<Xs, Pred, N, N, false> {
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template <typename Ys>
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static constexpr auto apply(Ys&&) {
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return hana::nothing;
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}
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};
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template <typename Xs, typename Pred, std::size_t i, std::size_t N>
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struct advance_until<Xs, Pred, i, N, true> {
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template <typename Ys>
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static constexpr auto apply(Ys&& ys) {
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return hana::just(hana::at_c<i - 1>(static_cast<Ys&&>(ys)));
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template <typename I>
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constexpr decltype(auto) operator()(I i) const {
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return hana::at(xs, i);
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}
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};
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}
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template <typename S>
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struct find_if_impl<S, when<Sequence<S>::value>> {
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template <typename Xs, typename Pred>
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static constexpr auto apply(Xs&& xs, Pred&&) {
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constexpr std::size_t N = decltype(hana::length(xs))::value;
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return detail::advance_until<Xs&&, Pred&&, 0, N, false>::apply(
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static_cast<Xs&&>(xs)
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);
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}
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};
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template <typename It>
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struct find_if_impl<It, when<hana::Iterable<It>::value && !Sequence<It>::value>> {
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template <typename Xs, typename Pred>
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static constexpr auto find_if_helper(Xs&& xs, Pred&& pred, hana::true_) {
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return hana::just(hana::front(
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hana::drop_while(static_cast<Xs&&>(xs),
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hana::compose(hana::not_, static_cast<Pred&&>(pred)))
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));
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}
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template <typename Xs, typename Pred>
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static constexpr auto find_if_helper(Xs&&, Pred&&, hana::false_) {
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return hana::nothing;
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}
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template <typename Tag>
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struct find_if_impl<Tag, when<Iterable<Tag>::value>> {
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template <typename Xs, typename Pred>
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static constexpr auto apply(Xs&& xs, Pred&& pred) {
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constexpr bool found = !decltype(
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hana::is_empty(hana::drop_while(static_cast<Xs&&>(xs),
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hana::compose(hana::not_, static_cast<Pred&&>(pred))))
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)::value;
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return find_if_impl::find_if_helper(static_cast<Xs&&>(xs),
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static_cast<Pred&&>(pred),
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hana::bool_<found>{});
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using Result = decltype(hana::index_if(
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static_cast<Xs&&>(xs), static_cast<Pred&&>(pred)));
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return hana::transform(Result{},
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detail::partial_at<std::decay_t<Xs>>{static_cast<Xs&&>(xs)});
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}
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};
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