Add mp_transform_if, mp_map_update

test/mp_transform_if.cpp

@@ -0,0 +1,46 @@
+
+//  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/algorithm.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>
+
+struct X1 {};
+struct X2 {};
+struct X3 {};
+struct X4 {};
+
+template<class T> using add_pointer = T*;
+template<class T> using is_not_ref = boost::mp_not<std::is_reference<T>>;
+
+int main()
+{
+    using boost::mp_list;
+    using boost::mp_transform_if;
+
+    using L1 = mp_list<X1, X2&, X3 const, X4 const&>;
+
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_transform_if<is_not_ref, add_pointer, L1>, mp_list<X1*, X2&, X3 const*, X4 const&>>));
+
+    using L2 = std::tuple<X1, X2&, X3 const, X4 const&>;
+
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_transform_if<is_not_ref, add_pointer, L2>, std::tuple<X1*, X2&, X3 const*, X4 const&>>));
+
+    using L3 = std::pair<X1 const, X2&>;
+
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_transform_if<is_not_ref, add_pointer, L3>, std::pair<X1 const*, X2&>>));
+
+    //
+
+    return boost::report_errors();
+}