diff options
author | DongHun Kwak <dh0128.kwak@samsung.com> | 2016-10-06 10:38:45 +0900 |
---|---|---|
committer | DongHun Kwak <dh0128.kwak@samsung.com> | 2016-10-06 10:39:52 +0900 |
commit | 5cde13f21d36c7224b0e13d11c4b49379ae5210d (patch) | |
tree | e8269ac85a4b0f7d416e2565fa4f451b5cb41351 /boost/hana/remove.hpp | |
parent | d9ec475d945d3035377a0d89ed42e382d8988891 (diff) | |
download | boost-5cde13f21d36c7224b0e13d11c4b49379ae5210d.tar.gz boost-5cde13f21d36c7224b0e13d11c4b49379ae5210d.tar.bz2 boost-5cde13f21d36c7224b0e13d11c4b49379ae5210d.zip |
Imported Upstream version 1.61.0
Change-Id: I96a1f878d1e6164f01e9aadd5147f38fca448d90
Signed-off-by: DongHun Kwak <dh0128.kwak@samsung.com>
Diffstat (limited to 'boost/hana/remove.hpp')
-rw-r--r-- | boost/hana/remove.hpp | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/boost/hana/remove.hpp b/boost/hana/remove.hpp new file mode 100644 index 0000000000..8472eb3c48 --- /dev/null +++ b/boost/hana/remove.hpp @@ -0,0 +1,54 @@ +/*! +@file +Defines `boost::hana::remove`. + +@copyright Louis Dionne 2013-2016 +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_REMOVE_HPP +#define BOOST_HANA_REMOVE_HPP + +#include <boost/hana/fwd/remove.hpp> + +#include <boost/hana/concept/monad_plus.hpp> +#include <boost/hana/config.hpp> +#include <boost/hana/core/dispatch.hpp> +#include <boost/hana/equal.hpp> +#include <boost/hana/filter.hpp> +#include <boost/hana/functional/compose.hpp> +#include <boost/hana/not.hpp> + + +BOOST_HANA_NAMESPACE_BEGIN + //! @cond + template <typename Xs, typename Value> + constexpr auto remove_t::operator()(Xs&& xs, Value&& value) const { + using M = typename hana::tag_of<Xs>::type; + using Remove = BOOST_HANA_DISPATCH_IF(remove_impl<M>, + hana::MonadPlus<M>::value + ); + + #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS + static_assert(hana::MonadPlus<M>::value, + "hana::remove(xs, value) requires 'xs' to be a MonadPlus"); + #endif + + return Remove::apply(static_cast<Xs&&>(xs), + static_cast<Value&&>(value)); + } + //! @endcond + + template <typename M, bool condition> + struct remove_impl<M, when<condition>> : default_ { + template <typename Xs, typename Value> + static constexpr auto apply(Xs&& xs, Value&& value) { + return hana::filter(static_cast<Xs&&>(xs), + hana::compose(hana::not_, + hana::equal.to(static_cast<Value&&>(value)))); + } + }; +BOOST_HANA_NAMESPACE_END + +#endif // !BOOST_HANA_REMOVE_HPP |