Add first cpp_type infrastructure

src/cpp_type.cpp

@@ -0,0 +1,15 @@
+// Copyright (C) 2017 Jonathan Müller <jonathanmueller.dev@gmail.com>
+// This file is subject to the license terms in the LICENSE file
+// found in the top-level directory of this distribution.
+
+#include <cppast/cpp_type.hpp>
+
+#include <cppast/cpp_entity.hpp>
+#include <cppast/cpp_entity_type.hpp>
+
+using namespace cppast;
+
+bool detail::cpp_type_ref_predicate::operator()(const cpp_entity& e)
+{
+    return is_type(e.type());
+}