1 files changed, 29 insertions, 24 deletions
diff --git a/include/yacppdic/factory.hpp b/include/yacppdic/factory.hpp
index 368175a..6de47d8 100644
--- a/include/yacppdic/factory.hpp
+++ b/include/yacppdic/factory.hpp
@@ -19,29 +19,7 @@ namespace yacppdic
 template <class>
 class Factory;
 
-template <class Return>
-// NOLINTNEXTLINE(readability-identifier-naming)
-struct maybe_derive_from_unary_function
-{
-};
-
-template <class Return, class Arg>
-struct maybe_derive_from_unary_function<Return(Arg)>
-	: public std::unary_function<Arg, Return>
-{
-};
-
-template <class Return>
-// NOLINTNEXTLINE(readability-identifier-naming)
-struct maybe_derive_from_binary_function
-{
-};
-
-template <class Return, class ArgOne, class ArgTwo>
-struct maybe_derive_from_binary_function<Return(ArgOne, ArgTwo)>
-	: public std::binary_function<ArgOne, ArgTwo, Return>
-{
-};
+}
 
 template <class Function>
 auto not_null(Function const & /*unused*/) -> bool
@@ -62,11 +40,38 @@ auto not_null(Return Class::*method_ptr) -> bool
 }
 
 template <class Function>
-auto not_null(Factory<Function> const &factory) -> bool
+auto not_null(yacppdic::Factory<Function> const &factory) -> bool
 {
 	return !!factory;
 }
 
+namespace yacppdic
+{
+
+template <class Return>
+// NOLINTNEXTLINE(readability-identifier-naming)
+struct maybe_derive_from_unary_function
+{
+};
+
+template <class Return, class Arg>
+struct maybe_derive_from_unary_function<Return(Arg)>
+	: public std::unary_function<Arg, Return>
+{
+};
+
+template <class Return>
+// NOLINTNEXTLINE(readability-identifier-naming)
+struct maybe_derive_from_binary_function
+{
+};
+
+template <class Return, class ArgOne, class ArgTwo>
+struct maybe_derive_from_binary_function<Return(ArgOne, ArgTwo)>
+	: public std::binary_function<ArgOne, ArgTwo, Return>
+{
+};
+
 template <typename Function, typename Return, typename... Args>
 concept Callable =
 	!std::is_same_v<