Add mp_map_update_q

test/mp_map_update_q.cpp

@@ -0,0 +1,51 @@
+
+// Copyright 2016, 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/map.hpp>
+#include <boost/mp11/list.hpp>
+#include <boost/mp11/integral.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+#include <type_traits>
+#include <tuple>
+#include <utility>
+
+using boost::mp11::mp_int;
+
+struct Q_inc
+{
+    template<class T, class U> using fn = mp_int<U::value + 1>;
+};
+
+int main()
+{
+    using boost::mp11::mp_map_update_q;
+    using boost::mp11::mp_list;
+
+    using M1 = mp_list<>;
+
+    using M2 = mp_map_update_q<M1, std::pair<char, mp_int<0>>, Q_inc>;
+    BOOST_TEST_TRAIT_TRUE((std::is_same<M2, mp_list<std::pair<char, mp_int<0>>>>));
+
+    using M3 = mp_map_update_q<M2, std::pair<char, mp_int<0>>, Q_inc>;
+    BOOST_TEST_TRAIT_TRUE((std::is_same<M3, mp_list<std::pair<char, mp_int<1>>>>));
+
+    using M4 = mp_map_update_q<M3, std::pair<int, mp_int<0>>, Q_inc>;
+    BOOST_TEST_TRAIT_TRUE((std::is_same<M4, mp_list<std::pair<char, mp_int<1>>, std::pair<int, mp_int<0>>>>));
+
+    using M5 = mp_map_update_q<M4, std::pair<long, mp_int<0>>, Q_inc>;
+    BOOST_TEST_TRAIT_TRUE((std::is_same<M5, mp_list<std::pair<char, mp_int<1>>, std::pair<int, mp_int<0>>, std::pair<long, mp_int<0>>>>));
+
+    using M6 = mp_map_update_q<M5, std::pair<long, mp_int<0>>, Q_inc>;
+    BOOST_TEST_TRAIT_TRUE((std::is_same<M6, mp_list<std::pair<char, mp_int<1>>, std::pair<int, mp_int<0>>, std::pair<long, mp_int<1>>>>));
+
+    using M7 = mp_map_update_q<M6, std::pair<char, mp_int<0>>, Q_inc>;
+    BOOST_TEST_TRAIT_TRUE((std::is_same<M7, mp_list<std::pair<char, mp_int<2>>, std::pair<int, mp_int<0>>, std::pair<long, mp_int<1>>>>));
+
+    return boost::report_errors();
+}