I have some c++ code with function return types declared as string^ or IEnumerable<String^>^, what does that mean?
edits: c#->c++/cli
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It doesn’t mean anything in C#. You’re looking at source code for C++/CLI, not C#.
See http://en.wikipedia.org/wiki/C%2B%2B/CLI for a brief introduction.
The carat symbol basically means “this is a GC-tracked reference”.