1 files changed, 93 insertions, 0 deletions
diff --git a/src/boost/libs/hof/test/reverse_fold.cpp b/src/boost/libs/hof/test/reverse_fold.cpp
new file mode 100644
index 00000000..9238e433
--- /dev/null
+++ b/src/boost/libs/hof/test/reverse_fold.cpp
@@ -0,0 +1,93 @@
+/*=============================================================================
+    Copyright (c) 2017 Paul Fultz II
+    reverse_fold.cpp
+    Distributed under the Boost Software License, Version 1.0. (See accompanying
+    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+==============================================================================*/
+#include <boost/hof/reverse_fold.hpp>
+#include "test.hpp"
+
+struct max_f
+{
+    template<class T, class U>
+    constexpr T operator()(T x, U y) const noexcept
+    {
+        return x > y ? x : y;
+    }
+};
+
+struct sum_f
+{
+    template<class T, class U>
+    constexpr T operator()(T x, U y) const BOOST_HOF_RETURNS_DEDUCE_NOEXCEPT(x+y)
+    {
+        return x + y;
+    }
+};
+
+#if BOOST_HOF_HAS_NOEXCEPT_DEDUCTION
+BOOST_HOF_TEST_CASE()
+{
+    static_assert(noexcept(boost::hof::reverse_fold(max_f(), 0)(2, 3, 4, 5)), "noexcept reverse_fold");
+    static_assert(noexcept(boost::hof::reverse_fold(sum_f(), 0)(2, 3, 4, 5)), "noexcept reverse_fold");
+    static_assert(!noexcept(boost::hof::reverse_fold(sum_f(), std::string())("hello", "-", "world")), "noexcept reverse_fold");
+}
+#endif
+
+BOOST_HOF_TEST_CASE()
+{
+    BOOST_HOF_TEST_CHECK(boost::hof::reverse_fold(max_f(), 0)(2, 3, 4, 5) == 5);
+    BOOST_HOF_TEST_CHECK(boost::hof::reverse_fold(max_f(), 0)(5, 4, 3, 2) == 5);
+    BOOST_HOF_TEST_CHECK(boost::hof::reverse_fold(max_f(), 0)(2, 3, 5, 4) == 5);
+
+    BOOST_HOF_STATIC_TEST_CHECK(boost::hof::reverse_fold(max_f(), 0)(2, 3, 4, 5) == 5);
+    BOOST_HOF_STATIC_TEST_CHECK(boost::hof::reverse_fold(max_f(), 0)(5, 4, 3, 2) == 5);
+    BOOST_HOF_STATIC_TEST_CHECK(boost::hof::reverse_fold(max_f(), 0)(2, 3, 5, 4) == 5);
+}
+
+BOOST_HOF_TEST_CASE()
+{
+    BOOST_HOF_TEST_CHECK(boost::hof::reverse_fold(max_f(), 0)() == 0);
+    BOOST_HOF_TEST_CHECK(boost::hof::reverse_fold(max_f(), 0)(5) == 5);
+
+    BOOST_HOF_STATIC_TEST_CHECK(boost::hof::reverse_fold(max_f(), 0)() == 0);
+    BOOST_HOF_STATIC_TEST_CHECK(boost::hof::reverse_fold(max_f(), 0)(5) == 5);
+}
+
+template<class... Ts>
+constexpr auto find_positive_max(Ts... xs) BOOST_HOF_RETURNS
+(
+    boost::hof::reverse_fold(max_f(), 0)(xs...)
+);
+
+BOOST_HOF_TEST_CASE()
+{
+    BOOST_HOF_TEST_CHECK(find_positive_max() == 0);
+    BOOST_HOF_TEST_CHECK(find_positive_max(5) == 5);
+
+    BOOST_HOF_STATIC_TEST_CHECK(find_positive_max() == 0);
+    BOOST_HOF_STATIC_TEST_CHECK(find_positive_max(5) == 5);
+}
+
+BOOST_HOF_TEST_CASE()
+{
+    BOOST_HOF_TEST_CHECK(boost::hof::reverse_fold(max_f())(5) == 5);
+
+    BOOST_HOF_STATIC_TEST_CHECK(boost::hof::reverse_fold(max_f())(5) == 5);
+}
+
+BOOST_HOF_TEST_CASE()
+{
+    BOOST_HOF_TEST_CHECK(boost::hof::reverse_fold(max_f())(2, 3, 4, 5) == 5);
+    BOOST_HOF_TEST_CHECK(boost::hof::reverse_fold(max_f())(5, 4, 3, 2) == 5);
+    BOOST_HOF_TEST_CHECK(boost::hof::reverse_fold(max_f())(2, 3, 5, 4) == 5);
+
+    BOOST_HOF_STATIC_TEST_CHECK(boost::hof::reverse_fold(max_f())(2, 3, 4, 5) == 5);
+    BOOST_HOF_STATIC_TEST_CHECK(boost::hof::reverse_fold(max_f())(5, 4, 3, 2) == 5);
+    BOOST_HOF_STATIC_TEST_CHECK(boost::hof::reverse_fold(max_f())(2, 3, 5, 4) == 5);
+}
+
+BOOST_HOF_TEST_CASE()
+{
+    BOOST_HOF_TEST_CHECK(boost::hof::reverse_fold(sum_f(), std::string())("hello", "-", "world") == "world-hello");
+}