diff --git a/IOStreams/StackableStreambuf.cc b/IOStreams/StackableStreambuf.cc
index 809bbb3..fe91023 100644
--- a/IOStreams/StackableStreambuf.cc
+++ b/IOStreams/StackableStreambuf.cc
@@ -93,6 +93,12 @@ namespace Alepha::Hydrogen::IOStreams::detail::StackableStreambuf_m
 		}
 	}
 
+	std::size_t
+	exports::stackDepth( std::ios &ios )
+	{
+		return getStack( ios ).size();
+	}
+
 	std::ostream &
 	impl::operator << ( std::ostream &os, PopStack )
 	{
diff --git a/IOStreams/StackableStreambuf.h b/IOStreams/StackableStreambuf.h
index a1eb219..8f4a4cd 100644
--- a/IOStreams/StackableStreambuf.h
+++ b/IOStreams/StackableStreambuf.h
@@ -21,6 +21,8 @@ namespace Alepha::Hydrogen::IOStreams  ::detail::  StackableStreambuf_m
 		template< typename > struct PushStack;
 
 		struct PopStack{};
+
+		std::size_t stackDepth( std::ios & );
 	}
 
 	struct StackableStreambufUnderlyingShim