add subtree-ish sources for 12.0.3

[ceph.git] / ceph / src / boost / libs / hana / example / filter.cpp

diff --git a/ceph/src/boost/libs/hana/example/filter.cpp b/ceph/src/boost/libs/hana/example/filter.cpp
new file mode 100644 (file)
index 0000000..e5d085f
--- /dev/null
+++ b/ceph/src/boost/libs/hana/example/filter.cpp
@@ -0,0 +1,25 @@
+// 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)
+
+#include <boost/hana/assert.hpp>
+#include <boost/hana/equal.hpp>
+#include <boost/hana/ext/std/integral_constant.hpp>
+#include <boost/hana/filter.hpp>
+#include <boost/hana/functional/compose.hpp>
+#include <boost/hana/optional.hpp>
+#include <boost/hana/tuple.hpp>
+#include <boost/hana/type.hpp>
+
+#include <type_traits>
+namespace hana = boost::hana;
+
+
+// First take the type of an object, and then tell whether it's integral
+constexpr auto is_integral = hana::compose(hana::trait<std::is_integral>, hana::typeid_);
+
+static_assert(hana::filter(hana::make_tuple(1, 2.0, 3, 4.0), is_integral) == hana::make_tuple(1, 3), "");
+static_assert(hana::filter(hana::just(3), is_integral) == hana::just(3), "");
+BOOST_HANA_CONSTANT_CHECK(hana::filter(hana::just(3.0), is_integral) == hana::nothing);
+
+int main() { }