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1 /*!
2 @file
3 Defines `boost::hana::remove`.
4
5 @copyright Louis Dionne 2013-2017
6 Distributed under the Boost Software License, Version 1.0.
7 (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
8 */
9
10 #ifndef BOOST_HANA_REMOVE_HPP
11 #define BOOST_HANA_REMOVE_HPP
12
13 #include <boost/hana/fwd/remove.hpp>
14
15 #include <boost/hana/concept/monad_plus.hpp>
16 #include <boost/hana/config.hpp>
17 #include <boost/hana/core/dispatch.hpp>
18 #include <boost/hana/equal.hpp>
19 #include <boost/hana/filter.hpp>
20 #include <boost/hana/functional/compose.hpp>
21 #include <boost/hana/not.hpp>
22
23
24 BOOST_HANA_NAMESPACE_BEGIN
25 //! @cond
26 template <typename Xs, typename Value>
27 constexpr auto remove_t::operator()(Xs&& xs, Value&& value) const {
28 using M = typename hana::tag_of<Xs>::type;
29 using Remove = BOOST_HANA_DISPATCH_IF(remove_impl<M>,
30 hana::MonadPlus<M>::value
31 );
32
33 #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
34 static_assert(hana::MonadPlus<M>::value,
35 "hana::remove(xs, value) requires 'xs' to be a MonadPlus");
36 #endif
37
38 return Remove::apply(static_cast<Xs&&>(xs),
39 static_cast<Value&&>(value));
40 }
41 //! @endcond
42
43 template <typename M, bool condition>
44 struct remove_impl<M, when<condition>> : default_ {
45 template <typename Xs, typename Value>
46 static constexpr auto apply(Xs&& xs, Value&& value) {
47 return hana::filter(static_cast<Xs&&>(xs),
48 hana::compose(hana::not_,
49 hana::equal.to(static_cast<Value&&>(value))));
50 }
51 };
52 BOOST_HANA_NAMESPACE_END
53
54 #endif // !BOOST_HANA_REMOVE_HPP