Generalize basic_cpp_entity_ref to use predicate

src/cpp_namespace.cpp

@@ -0,0 +1,34 @@
+// 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_namespace.hpp>
+
+#include <cppast/cpp_entity_type.hpp>
+
+using namespace cppast;
+
+cpp_entity_type cpp_namespace::do_get_entity_type() const noexcept
+{
+    return cpp_entity_type::namespace_t;
+}
+
+bool detail::cpp_namespace_ref_predicate::operator()(const cpp_entity& e)
+{
+    return e.type() == cpp_entity_type::namespace_t;
+}
+
+cpp_entity_type cpp_namespace_alias::do_get_entity_type() const noexcept
+{
+    return cpp_entity_type::namespace_alias_t;
+}
+
+cpp_entity_type cpp_using_directive::do_get_entity_type() const noexcept
+{
+    return cpp_entity_type::using_directive_t;
+}
+
+cpp_entity_type cpp_using_declaration::do_get_entity_type() const noexcept
+{
+    return cpp_entity_type::using_declaration_t;
+}