summaryrefslogtreecommitdiff
path: root/boost/hana/erase_key.hpp
diff options
context:
space:
mode:
Diffstat (limited to 'boost/hana/erase_key.hpp')
-rw-r--r--boost/hana/erase_key.hpp37
1 files changed, 37 insertions, 0 deletions
diff --git a/boost/hana/erase_key.hpp b/boost/hana/erase_key.hpp
new file mode 100644
index 0000000000..20648f3c29
--- /dev/null
+++ b/boost/hana/erase_key.hpp
@@ -0,0 +1,37 @@
+/*!
+@file
+Defines `boost::hana::erase_key`.
+
+@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_ERASE_KEY_HPP
+#define BOOST_HANA_ERASE_KEY_HPP
+
+#include <boost/hana/fwd/erase_key.hpp>
+
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/dispatch.hpp>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+ //! @cond
+ template <typename Set, typename ...Args>
+ constexpr decltype(auto) erase_key_t::operator()(Set&& set, Args&& ...args) const {
+ return erase_key_impl<typename hana::tag_of<Set>::type>::apply(
+ static_cast<Set&&>(set),
+ static_cast<Args&&>(args)...
+ );
+ }
+ //! @endcond
+
+ template <typename T, bool condition>
+ struct erase_key_impl<T, when<condition>> : default_ {
+ template <typename ...Args>
+ static constexpr auto apply(Args&& ...) = delete;
+ };
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_ERASE_KEY_HPP