early-access version 3088

externals/vcpkg/buildtrees/boost-mp11/src/ost-1.79.0-98abe5fba3.clean/test/mp_at.cpp

@@ -0,0 +1,74 @@
+
+//  Copyright 2015 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 {};
+struct X5 {};
+
+int main()
+{
+    using boost::mp11::mp_list;
+    using boost::mp11::mp_at;
+    using boost::mp11::mp_at_c;
+    using boost::mp11::mp_size_t;
+
+    {
+        using L1 = mp_list<X1, X2, X3, X4, X5>;
+
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_at_c<L1, 0>, X1>));
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_at_c<L1, 1>, X2>));
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_at_c<L1, 2>, X3>));
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_at_c<L1, 3>, X4>));
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_at_c<L1, 4>, X5>));
+
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_at<L1, mp_size_t<0>>, X1>));
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_at<L1, mp_size_t<1>>, X2>));
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_at<L1, mp_size_t<2>>, X3>));
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_at<L1, mp_size_t<3>>, X4>));
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_at<L1, mp_size_t<4>>, X5>));
+    }
+
+    {
+        using L1 = std::tuple<X1, X2, X3, X4, X5>;
+
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_at_c<L1, 0>, X1>));
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_at_c<L1, 1>, X2>));
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_at_c<L1, 2>, X3>));
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_at_c<L1, 3>, X4>));
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_at_c<L1, 4>, X5>));
+
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_at<L1, mp_size_t<0>>, X1>));
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_at<L1, mp_size_t<1>>, X2>));
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_at<L1, mp_size_t<2>>, X3>));
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_at<L1, mp_size_t<3>>, X4>));
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_at<L1, mp_size_t<4>>, X5>));
+    }
+
+    {
+        using L1 = std::pair<X1, X2>;
+
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_at_c<L1, 0>, X1>));
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_at_c<L1, 1>, X2>));
+
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_at<L1, mp_size_t<0>>, X1>));
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_at<L1, mp_size_t<1>>, X2>));
+    }
+
+    return boost::report_errors();
+}