1 files changed, 52 insertions, 0 deletions
diff --git a/boost/hana/remove_if.hpp b/boost/hana/remove_if.hpp
new file mode 100644
index 0000000000..fb85c3d424
--- /dev/null
+++ b/boost/hana/remove_if.hpp
@@ -0,0 +1,52 @@
+/*!
+@file
+Defines `boost::hana::remove_if`.
+
+@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_IF_HPP
+#define BOOST_HANA_REMOVE_IF_HPP
+
+#include <boost/hana/fwd/remove_if.hpp>
+
+#include <boost/hana/concept/monad_plus.hpp>
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/dispatch.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 Pred>
+    constexpr auto remove_if_t::operator()(Xs&& xs, Pred&& pred) const {
+        using M = typename hana::tag_of<Xs>::type;
+        using RemoveIf = BOOST_HANA_DISPATCH_IF(remove_if_impl<M>,
+            hana::MonadPlus<M>::value
+        );
+
+        #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
+            static_assert(hana::MonadPlus<M>::value,
+            "hana::remove_if(xs, predicate) requires 'xs' to be a MonadPlus");
+        #endif
+
+        return RemoveIf::apply(static_cast<Xs&&>(xs),
+                               static_cast<Pred&&>(pred));
+    }
+    //! @endcond
+
+    template <typename M, bool condition>
+    struct remove_if_impl<M, when<condition>> : default_ {
+        template <typename Xs, typename Pred>
+        static constexpr auto apply(Xs&& xs, Pred&& pred) {
+            return hana::filter(static_cast<Xs&&>(xs),
+                        hana::compose(hana::not_, static_cast<Pred&&>(pred)));
+        }
+    };
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_REMOVE_IF_HPP