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/*!
@file
Defines `boost::hana::set`.
@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_SET_HPP
#define BOOST_HANA_SET_HPP
#include <boost/hana/fwd/set.hpp>
#include <boost/hana/at.hpp>
#include <boost/hana/bool.hpp>
#include <boost/hana/concept/comparable.hpp>
#include <boost/hana/concept/constant.hpp>
#include <boost/hana/concept/hashable.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/contains.hpp>
#include <boost/hana/core/make.hpp>
#include <boost/hana/core/to.hpp>
#include <boost/hana/detail/decay.hpp>
#include <boost/hana/detail/fast_and.hpp>
#include <boost/hana/detail/has_duplicates.hpp>
#include <boost/hana/detail/operators/adl.hpp>
#include <boost/hana/detail/operators/comparable.hpp>
#include <boost/hana/detail/operators/searchable.hpp>
#include <boost/hana/equal.hpp>
#include <boost/hana/erase_key.hpp>
#include <boost/hana/find_if.hpp>
#include <boost/hana/fold_left.hpp>
#include <boost/hana/fwd/any_of.hpp>
#include <boost/hana/fwd/core/to.hpp>
#include <boost/hana/fwd/difference.hpp>
#include <boost/hana/fwd/intersection.hpp>
#include <boost/hana/fwd/union.hpp>
#include <boost/hana/insert.hpp>
#include <boost/hana/is_subset.hpp>
#include <boost/hana/length.hpp>
#include <boost/hana/or.hpp>
#include <boost/hana/remove.hpp>
#include <boost/hana/tuple.hpp>
#include <boost/hana/unpack.hpp>
#include <boost/hana/value.hpp>
#include <cstddef>
#include <type_traits>
#include <utility>
BOOST_HANA_NAMESPACE_BEGIN
//////////////////////////////////////////////////////////////////////////
// set
//////////////////////////////////////////////////////////////////////////
//! @cond
template <typename ...Xs>
struct set
: detail::operators::adl<set<Xs...>>
, detail::searchable_operators<set<Xs...>>
{
tuple<Xs...> storage;
using hana_tag = set_tag;
static constexpr std::size_t size = sizeof...(Xs);
explicit constexpr set(tuple<Xs...> const& xs)
: storage(xs)
{ }
explicit constexpr set(tuple<Xs...>&& xs)
: storage(static_cast<tuple<Xs...>&&>(xs))
{ }
constexpr set() = default;
constexpr set(set const& other) = default;
constexpr set(set&& other) = default;
};
//! @endcond
//////////////////////////////////////////////////////////////////////////
// Operators
//////////////////////////////////////////////////////////////////////////
namespace detail {
template <>
struct comparable_operators<set_tag> {
static constexpr bool value = true;
};
}
//////////////////////////////////////////////////////////////////////////
// make<set_tag>
//////////////////////////////////////////////////////////////////////////
template <>
struct make_impl<set_tag> {
template <typename ...Xs>
static constexpr auto apply(Xs&& ...xs) {
#if defined(BOOST_HANA_CONFIG_ENABLE_DEBUG_MODE)
static_assert(detail::fast_and<hana::Comparable<Xs>::value...>::value,
"hana::make_set(xs...) requires all the 'xs' to be Comparable");
static_assert(detail::fast_and<hana::Hashable<Xs>::value...>::value,
"hana::make_set(xs...) requires all the 'xs' to be Hashable");
static_assert(detail::fast_and<
Constant<decltype(hana::equal(xs, xs))>::value...
>::value,
"hana::make_set(xs...) requires all the 'xs' to be "
"Comparable at compile-time");
static_assert(!detail::has_duplicates<Xs&&...>::value,
"hana::make_set(xs...) requires all the 'xs' to be unique");
#endif
return set<typename detail::decay<Xs>::type...>{
hana::make_tuple(static_cast<Xs&&>(xs)...)
};
}
};
//////////////////////////////////////////////////////////////////////////
// Comparable
//////////////////////////////////////////////////////////////////////////
template <>
struct equal_impl<set_tag, set_tag> {
template <typename S1, typename S2>
static constexpr auto equal_helper(S1 const& s1, S2 const& s2, hana::true_)
{ return hana::is_subset(s1, s2); }
template <typename S1, typename S2>
static constexpr auto equal_helper(S1 const&, S2 const&, hana::false_)
{ return hana::false_c; }
template <typename S1, typename S2>
static constexpr decltype(auto) apply(S1&& s1, S2&& s2) {
return equal_impl::equal_helper(s1, s2, hana::bool_c<
decltype(hana::length(s1.storage))::value ==
decltype(hana::length(s2.storage))::value
>);
}
};
//////////////////////////////////////////////////////////////////////////
// Foldable
//////////////////////////////////////////////////////////////////////////
template <>
struct unpack_impl<set_tag> {
template <typename Set, typename F>
static constexpr decltype(auto) apply(Set&& set, F&& f) {
return hana::unpack(static_cast<Set&&>(set).storage,
static_cast<F&&>(f));
}
};
//////////////////////////////////////////////////////////////////////////
// Searchable
//////////////////////////////////////////////////////////////////////////
template <>
struct find_if_impl<set_tag> {
template <typename Xs, typename Pred>
static constexpr auto apply(Xs&& xs, Pred&& pred) {
return hana::find_if(static_cast<Xs&&>(xs).storage, static_cast<Pred&&>(pred));
}
};
template <>
struct any_of_impl<set_tag> {
template <typename Pred>
struct any_of_helper {
Pred const& pred;
template <typename ...X>
constexpr auto operator()(X const& ...x) const {
return hana::or_(pred(x)...);
}
constexpr auto operator()() const {
return hana::false_c;
}
};
template <typename Xs, typename Pred>
static constexpr auto apply(Xs const& xs, Pred const& pred) {
return hana::unpack(xs.storage, any_of_helper<Pred>{pred});
}
};
template <>
struct is_subset_impl<set_tag, set_tag> {
template <typename Ys>
struct all_contained {
Ys const& ys;
template <typename ...X>
constexpr auto operator()(X const& ...x) const {
return hana::bool_c<detail::fast_and<
hana::value<decltype(hana::contains(ys, x))>()...
>::value>;
}
};
template <typename Xs, typename Ys>
static constexpr auto apply(Xs const& xs, Ys const& ys) {
return hana::unpack(xs, all_contained<Ys>{ys});
}
};
//////////////////////////////////////////////////////////////////////////
// Conversions
//////////////////////////////////////////////////////////////////////////
template <typename F>
struct to_impl<set_tag, F, when<hana::Foldable<F>::value>> {
template <typename Xs>
static constexpr decltype(auto) apply(Xs&& xs) {
return hana::fold_left(static_cast<Xs&&>(xs),
hana::make_set(),
hana::insert);
}
};
//////////////////////////////////////////////////////////////////////////
// insert
//////////////////////////////////////////////////////////////////////////
template <>
struct insert_impl<set_tag> {
template <typename Xs, typename X, typename Indices>
static constexpr auto
insert_helper(Xs&& xs, X&&, hana::true_, Indices) {
return static_cast<Xs&&>(xs);
}
template <typename Xs, typename X, std::size_t ...n>
static constexpr auto
insert_helper(Xs&& xs, X&& x, hana::false_, std::index_sequence<n...>) {
return hana::make_set(
hana::at_c<n>(static_cast<Xs&&>(xs).storage)..., static_cast<X&&>(x)
);
}
template <typename Xs, typename X>
static constexpr auto apply(Xs&& xs, X&& x) {
constexpr bool c = hana::value<decltype(hana::contains(xs, x))>();
constexpr std::size_t size = std::remove_reference<Xs>::type::size;
return insert_helper(static_cast<Xs&&>(xs), static_cast<X&&>(x),
hana::bool_c<c>, std::make_index_sequence<size>{});
}
};
//////////////////////////////////////////////////////////////////////////
// erase_key
//////////////////////////////////////////////////////////////////////////
template <>
struct erase_key_impl<set_tag> {
template <typename Xs, typename X>
static constexpr decltype(auto) apply(Xs&& xs, X&& x) {
return hana::unpack(
hana::remove(static_cast<Xs&&>(xs).storage,
static_cast<X&&>(x)),
hana::make_set
);
}
};
//////////////////////////////////////////////////////////////////////////
// intersection
//////////////////////////////////////////////////////////////////////////
namespace detail {
template <typename Ys>
struct set_insert_if_contains {
Ys const& ys;
template <typename Result, typename Key>
static constexpr auto helper(Result&& result, Key&& key, hana::true_) {
return hana::insert(static_cast<Result&&>(result), static_cast<Key&&>(key));
}
template <typename Result, typename Key>
static constexpr auto helper(Result&& result, Key&&, hana::false_) {
return static_cast<Result&&>(result);
}
template <typename Result, typename Key>
constexpr auto operator()(Result&& result, Key&& key) const {
constexpr bool keep = hana::value<decltype(hana::contains(ys, key))>();
return set_insert_if_contains::helper(static_cast<Result&&>(result),
static_cast<Key&&>(key),
hana::bool_c<keep>);
}
};
}
template <>
struct intersection_impl<set_tag> {
template <typename Xs, typename Ys>
static constexpr auto apply(Xs&& xs, Ys const& ys) {
return hana::fold_left(static_cast<Xs&&>(xs), hana::make_set(),
detail::set_insert_if_contains<Ys>{ys});
}
};
//////////////////////////////////////////////////////////////////////////
// union_
//////////////////////////////////////////////////////////////////////////
template <>
struct union_impl<set_tag> {
template <typename Xs, typename Ys>
static constexpr auto apply(Xs&& xs, Ys&& ys) {
return hana::fold_left(static_cast<Xs&&>(xs), static_cast<Ys&&>(ys),
hana::insert);
}
};
//////////////////////////////////////////////////////////////////////////
// difference
//////////////////////////////////////////////////////////////////////////
template <>
struct difference_impl<set_tag> {
template <typename Xs, typename Ys>
static constexpr auto apply(Xs&& xs, Ys&& ys) {
return hana::fold_left(static_cast<Ys&&>(ys), static_cast<Xs&&>(xs),
hana::erase_key);
}
};
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_SET_HPP
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