Add mp_min_element, mp_max_element

test/mp_max_element.cpp

@@ -0,0 +1,55 @@
+
+// Copyright 2017 Peter Dimov.
+//
+// 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/mp11/algorithm.hpp>
+#include <boost/mp11/list.hpp>
+#include <boost/mp11/integral.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+#include <type_traits>
+#include <tuple>
+
+using boost::mp11::mp_bool;
+
+template<class T, class U> using sizeof_less = mp_bool<(sizeof(T) < sizeof(U))>;
+
+int main()
+{
+    using boost::mp11::mp_list;
+    using boost::mp11::mp_max_element;
+
+    {
+        using L1 = mp_list<void>;
+
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_max_element<L1, sizeof_less>, void>));
+
+        using L2 = mp_list<char[2], char[4], char[3], char[1]>;
+
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_max_element<L2, sizeof_less>, char[4]>));
+
+        using L3 = mp_list<char[2], char[4], char[2], char[3], char[1], char[2], char[1]>;
+
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_max_element<L3, sizeof_less>, char[4]>));
+    }
+
+    {
+        using L1 = std::tuple<void>;
+
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_max_element<L1, sizeof_less>, void>));
+
+        using L2 = std::tuple<char[2], char[4], char[3], char[1]>;
+
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_max_element<L2, sizeof_less>, char[4]>));
+
+        using L3 = std::tuple<char[2], char[4], char[2], char[3], char[1], char[2], char[1]>;
+
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_max_element<L3, sizeof_less>, char[4]>));
+    }
+
+    return boost::report_errors();
+}