Add mp_count_if_q

test/Jamfile

@@ -44,6 +44,7 @@ run mp_transform_if_q.cpp ;
 run mp_fill.cpp ;
 run mp_count.cpp ;
 run mp_count_if.cpp ;
+run mp_count_if_q.cpp ;
 run mp_contains.cpp ;
 run mp_repeat.cpp ;
 run mp_product.cpp ;

test/mp_count_if_q.cpp

@@ -0,0 +1,61 @@
+
+// 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/mp11/utility.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+#include <type_traits>
+#include <tuple>
+#include <utility>
+
+struct X1 {};
+
+int main()
+{
+    using boost::mp11::mp_list;
+    using boost::mp11::mp_count_if_q;
+    using boost::mp11::mp_size_t;
+    using boost::mp11::mp_quote;
+
+    {
+        using L1 = mp_list<>;
+
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_count_if_q<L1, mp_quote<std::is_const>>, mp_size_t<0>>));
+
+        using L2 = mp_list<X1, X1 const, X1*, X1 const, X1*, X1*>;
+
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_count_if_q<L2, mp_quote<std::is_volatile>>, mp_size_t<0>>));
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_count_if_q<L2, mp_quote<std::is_const>>, mp_size_t<2>>));
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_count_if_q<L2, mp_quote<std::is_pointer>>, mp_size_t<3>>));
+    }
+
+    {
+        using L1 = std::tuple<>;
+
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_count_if_q<L1, mp_quote<std::is_const>>, mp_size_t<0>>));
+
+        using L2 = std::tuple<X1, X1 const, X1*, X1 const, X1*, X1*>;
+
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_count_if_q<L2, mp_quote<std::is_volatile>>, mp_size_t<0>>));
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_count_if_q<L2, mp_quote<std::is_const>>, mp_size_t<2>>));
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_count_if_q<L2, mp_quote<std::is_pointer>>, mp_size_t<3>>));
+    }
+
+    {
+        using L2 = std::pair<X1 const, X1*>;
+
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_count_if_q<L2, mp_quote<std::is_volatile>>, mp_size_t<0>>));
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_count_if_q<L2, mp_quote<std::is_const>>, mp_size_t<1>>));
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_count_if_q<L2, mp_quote<std::is_pointer>>, mp_size_t<1>>));
+    }
+
+    return boost::report_errors();
+}