Add mp_value; enable mp_rename on value lists. Refs #53.

test/mp_value.cpp

@@ -0,0 +1,40 @@
+// Copyright 2023 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/mp11/integral.hpp>
+
+#if !defined(BOOST_MP11_HAS_TEMPLATE_AUTO)
+
+#pragma message("Test skipped because BOOST_MP11_HAS_TEMPLATE_AUTO is not defined")
+int main() {}
+
+#else
+
+#include <boost/core/lightweight_test_trait.hpp>
+#include <type_traits>
+#include <cstddef>
+
+int main()
+{
+    using boost::mp11::mp_value;
+
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_value<false>, std::integral_constant<bool, false>>));
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_value<true>, std::integral_constant<bool, true>>));
+
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_value<'a'>, std::integral_constant<char, 'a'>>));
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_value<'0'>, std::integral_constant<char, '0'>>));
+
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_value<0>, std::integral_constant<int, 0>>));
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_value<-1>, std::integral_constant<int, -1>>));
+
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_value<0L>, std::integral_constant<long, 0>>));
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_value<-1L>, std::integral_constant<long, -1>>));
+
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_value<0u>, std::integral_constant<unsigned, 0>>));
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_value<1u>, std::integral_constant<unsigned, 1>>));
+
+    return boost::report_errors();
+}
+
+#endif