Rename Q::apply to Q::invoke, mp_unquote to mp_invoke.

test/mp_invoke.cpp

@@ -0,0 +1,56 @@
+
+//  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/utility.hpp>
+#include <boost/mp11/integral.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+#include <type_traits>
+
+using boost::mp11::mp_invoke;
+using boost::mp11::mp_size_t;
+
+struct Q1
+{
+    template<class...> using invoke = void;
+};
+
+struct Q2
+{
+    template<class...> class invoke;
+};
+
+struct Q3
+{
+    template<class... T> using invoke = mp_size_t<sizeof...(T)>;
+};
+
+struct Q4
+{
+    template<class T1, class... T> using invoke = T1;
+};
+
+int main()
+{
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_invoke<Q1>, void>));
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_invoke<Q1, int>, void>));
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_invoke<Q1, int[], char[]>, void>));
+
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_invoke<Q2>, Q2::invoke<>>));
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_invoke<Q2, int>, Q2::invoke<int>>));
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_invoke<Q2, int[], char[]>, Q2::invoke<int[], char[]>>));
+
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_invoke<Q3>, mp_size_t<0>>));
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_invoke<Q3, int>, mp_size_t<1>>));
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_invoke<Q3, int[], char[]>, mp_size_t<2>>));
+
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_invoke<Q4, int>, int>));
+    BOOST_TEST_TRAIT_TRUE((std::is_same<mp_invoke<Q4, int[], char[]>, int[]>));
+
+    return boost::report_errors();
+}