From 05ff115820656266b9fec1adbef2f005ef0b44a4 Mon Sep 17 00:00:00 2001
From: frostbane <frostbane@programmer.net>
Date: Sun, 30 Nov 2025 01:19:17 +0900
Subject: [PATCH 1/2] add default constructor for adding a base class returning
 a derived class

---
 src/injectpp/config.hpp | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/injectpp/config.hpp b/src/injectpp/config.hpp
index 68b5da5..9fa3ae3 100644
--- a/src/injectpp/config.hpp
+++ b/src/injectpp/config.hpp
@@ -7,6 +7,13 @@
 
 namespace nt { namespace ioc {
 
+template<class U, class T, class ...Deps>
+std::unique_ptr<U>
+default_factory_as(Deps*... deps)
+{
+    return std::make_unique<T>(deps...);
+}
+
 template<class T, class ...Deps>
 std::unique_ptr<T>
 default_factory(Deps*... deps)
@@ -17,6 +24,12 @@ default_factory(Deps*... deps)
 class Config
 {
 public:
+    template<class Base, class InstanceType, class ...Deps>
+    void add_as()
+    {
+        add(default_factory_as<Base, InstanceType, Deps...>);
+    }
+
     template<class InstanceType, class ...Deps>
     void add()
     {

From 5183cf44cb9e8c0b9843e53d3cce345b747dd0e3 Mon Sep 17 00:00:00 2001
From: frostbane <frostbane@programmer.net>
Date: Sun, 30 Nov 2025 12:48:43 +0900
Subject: [PATCH 2/2] refactor the default factory

---
 src/injectpp/config.hpp | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/src/injectpp/config.hpp b/src/injectpp/config.hpp
index 9fa3ae3..a2ca5cc 100644
--- a/src/injectpp/config.hpp
+++ b/src/injectpp/config.hpp
@@ -9,13 +9,6 @@ namespace nt { namespace ioc {
 
 template<class U, class T, class ...Deps>
 std::unique_ptr<U>
-default_factory_as(Deps*... deps)
-{
-    return std::make_unique<T>(deps...);
-}
-
-template<class T, class ...Deps>
-std::unique_ptr<T>
 default_factory(Deps*... deps)
 {
     return std::make_unique<T>(deps...);
@@ -27,13 +20,13 @@ class Config
     template<class Base, class InstanceType, class ...Deps>
     void add_as()
     {
-        add(default_factory_as<Base, InstanceType, Deps...>);
+        add(default_factory<Base, InstanceType, Deps...>);
     }
 
     template<class InstanceType, class ...Deps>
     void add()
     {
-        add(default_factory<InstanceType, Deps...>);
+        add(default_factory<InstanceType, InstanceType, Deps...>);
     }
 
     template<class InstanceType, class Deleter, class ...Deps>