X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fbindable.h;h=bde5e85a11752b3a95a07de5187ad174b3c4a50a;hb=27fe0982fc18d1f5f9efe942e18c42f508268f34;hp=76c2fb528b7967839fa606a6c8a076ce190ee525;hpb=904de4f7fd994886adbd3a6c03bc1b7c14ebc562;p=libs%2Fgl.git

diff --git a/source/bindable.h b/source/bindable.h
index 76c2fb52..bde5e85a 100644
--- a/source/bindable.h
+++ b/source/bindable.h
@@ -33,6 +33,36 @@ template<typename T>
 const T *Bindable<T>::cur_obj;
 
 
+/**
+A helper class for Bindables that revert to a default object on unbind.
+*/
+template<typename T>
+class BindableWithDefault: protected Bindable<T>
+{
+protected:
+	BindableWithDefault() { }
+
+public:
+	static const T *current()
+	{
+		if(!Bindable<T>::cur_obj)
+			Bindable<T>::cur_obj = &default_object();
+		return Bindable<T>::cur_obj;
+	}
+
+	static void unbind()
+	{
+		default_object().bind();
+	}
+
+	static const T &default_object()
+	{
+		static T obj;
+		return obj;
+	}
+};
+
+
 /**
 RAII class for binding things.  Binds the thing upon construction and unbinds
 it upon destruction.  If a null pointer is given, unbinds upon construction and