Adding upstream version 14.2.21.upstream/14.2.21upstream

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

1 files changed, 18 insertions, 0 deletions

diff --git a/src/boost/libs/hana/example/functional/fix.cpp b/src/boost/libs/hana/example/functional/fix.cpp
new file mode 100644
index 00000000..62ad0374
--- /dev/null
+++ b/src/boost/libs/hana/example/functional/fix.cpp
@@ -0,0 +1,18 @@
+// 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/fix.hpp>
+namespace hana = boost::hana;
+
+
+BOOST_HANA_CONSTEXPR_STATELESS_LAMBDA auto factorial = hana::fix([](auto fact, auto n) -> int {
+    if (n == 0) return 1;
+    else        return n * fact(n - 1);
+});
+
+int main() {
+    BOOST_HANA_CONSTEXPR_CHECK(factorial(5) == 120);
+}