Parameters passing between C# and C++/CLI

In C#, parameters can be pass as "ref" or "out".
When writing a C++/CLI library, for the sake of interoperability, we might need to use these features in C++/CLI too.
Mapping:

C#	C++/CLI
ref x	x% // Managed type reference
out x	[System::Runtime::InteropServices::Out] x %