Adding upstream version 14.2.21.upstream/14.2.21upstream

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

1 files changed, 21 insertions, 0 deletions

diff --git a/src/boost/libs/hana/example/functional/flip.cpp b/src/boost/libs/hana/example/functional/flip.cpp
new file mode 100644
index 00000000..9afb2bca
--- /dev/null
+++ b/src/boost/libs/hana/example/functional/flip.cpp
@@ -0,0 +1,21 @@
+// 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/config.hpp>
+#include <boost/hana/functional/flip.hpp>
+namespace hana = boost::hana;
+
+
+BOOST_HANA_CONSTEXPR_LAMBDA auto minus = [](int x, int y, int z = 0) {
+    return x - y - z;
+};
+
+int main() {
+    BOOST_HANA_CONSTEXPR_CHECK(minus(3, 0) == 3 - 0);
+    BOOST_HANA_CONSTEXPR_CHECK(hana::flip(minus)(3, 0) == 0 - 3);
+
+    BOOST_HANA_CONSTEXPR_CHECK(minus(3, 0, 1) == 3 - 0 - 1);
+    BOOST_HANA_CONSTEXPR_CHECK(hana::flip(minus)(3, 0, 1) == 0 - 3 - 1);
+}