Document mp_plus

test/mp_plus.cpp

@@ -0,0 +1,32 @@
+
+// Copyright 2015-2017 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/function.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+#include <type_traits>
+
+template<class T, T N> using integral = std::integral_constant<T, N>;
+
+int main()
+{
+    using boost::mp11::mp_plus;
+
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_plus<>, integral<int, 0>>));
+
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_plus<integral<char, 1>>, integral<int, 1>>));
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_plus<integral<short, 2>>, integral<int, 2>>));
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_plus<integral<int, 3>>, integral<int, 3>>));
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_plus<integral<unsigned, 4>>, integral<unsigned, 4>>));
+
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_plus<integral<char, 1>, integral<char, 2>>, integral<int, 3>>));
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_plus<integral<short, 1>, integral<short, 2>, integral<short, 3>>, integral<int, 6>>));
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_plus<integral<int, 1>, integral<int, 2>, integral<int, 3>, integral<long, 4>>, integral<long, 10>>));
+
+    return boost::report_errors();
+}