From b6ea30f9c180d69520ac0ee6a3b565956553a618 Mon Sep 17 00:00:00 2001
From: Lynix <lynix680@gmail.com>
Date: Wed, 30 Mar 2016 18:15:17 +0200
Subject: [PATCH] Lua/LuaClass: Add a default ToString implementation

Former-commit-id: ff6c9cf1d18d34ad8fd7b03c970eec2da5ba0947
---
 include/Nazara/Lua/LuaClass.hpp |  1 +
 include/Nazara/Lua/LuaClass.inl | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/include/Nazara/Lua/LuaClass.hpp b/include/Nazara/Lua/LuaClass.hpp
index b4aa9d87b..130ac2904 100644
--- a/include/Nazara/Lua/LuaClass.hpp
+++ b/include/Nazara/Lua/LuaClass.hpp
@@ -86,6 +86,7 @@ namespace Nz
 			static int StaticGetterProxy(lua_State* state);
 			static int StaticMethodProxy(lua_State* state);
 			static int StaticSetterProxy(lua_State* state);
+			static int ToStringProxy(lua_State* state);
 
 			std::map<String, ClassFunc> m_methods;
 			std::map<String, StaticFunc> m_staticMethods;
diff --git a/include/Nazara/Lua/LuaClass.inl b/include/Nazara/Lua/LuaClass.inl
index b2bbdbc3e..393225399 100644
--- a/include/Nazara/Lua/LuaClass.inl
+++ b/include/Nazara/Lua/LuaClass.inl
@@ -64,6 +64,15 @@ namespace Nz
 			lua.PushString(m_info->name);
 			lua.SetField("__type");
 
+			// In case a __tostring method is missing, add a default implementation returning the type
+			if (m_methods.find("__tostring") == m_methods.end())
+			{
+				// Define the Finalizer
+				lua.PushValue(1); // shared_ptr on UserData
+				lua.PushCFunction(ToStringProxy, 1);
+				lua.SetField("__tostring");
+			}
+
 			// Define the Finalizer
 			lua.PushValue(1);
 			lua.PushCFunction(FinalizerProxy, 1);
@@ -486,6 +495,17 @@ namespace Nz
 
 		return 1;
 	}
+
+	template<class T>
+	int LuaClass<T>::ToStringProxy(lua_State* state)
+	{
+		LuaInstance& lua = *LuaInstance::GetInstance(state);
+
+		std::shared_ptr<ClassInfo>& info = *static_cast<std::shared_ptr<ClassInfo>*>(lua.ToUserdata(lua.GetIndexOfUpValue(1)));
+
+		lua.PushString(info->name);
+		return 1;
+	}
 }
 
 #include <Nazara/Lua/DebugOff.hpp>