Adding upstream version 16.2.11+ds.upstream/16.2.11+dsupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 28 insertions, 0 deletions

diff --git a/src/boost/libs/hana/example/unfold_left.cpp b/src/boost/libs/hana/example/unfold_left.cpp
new file mode 100644
index 000000000..4d77d01cf
--- /dev/null
+++ b/src/boost/libs/hana/example/unfold_left.cpp
@@ -0,0 +1,28 @@
+// Copyright Louis Dionne 2013-2017
+// 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/if.hpp>
+#include <boost/hana/integral_constant.hpp>
+#include <boost/hana/minus.hpp>
+#include <boost/hana/optional.hpp>
+#include <boost/hana/pair.hpp>
+#include <boost/hana/tuple.hpp>
+#include <boost/hana/unfold_left.hpp>
+namespace hana = boost::hana;
+
+
+BOOST_HANA_CONSTANT_CHECK(
+    hana::unfold_left<hana::tuple_tag>(hana::int_c<10>, [](auto x) {
+        return hana::if_(x == hana::int_c<0>,
+            hana::nothing,
+            hana::just(hana::make_pair(x - hana::int_c<1>, x))
+        );
+    })
+    ==
+    hana::tuple_c<int, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10>
+);
+
+int main() { }