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How do I marshal a unmanaged C++ map<> to be consumed by a .Net C# client?

jxbma asked
Last Modified: 2015-03-24

I'm building a CLI/CPP layer to communicate between a native C++ library and a .Net (C#) client.

I have a map defined as the following in native C++
class FooClass;
std::map<int, FooClass> aMap;
SomeMethod(std::map<int, FooClass>);

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I assumed that to call C# from my CLI/CPP layer, I would use a Dictionary<int, SomeFooClass>
When I attempt to do so, I get the following error:
Cannot marshal 'parameter #1': Generic types cannot be marshaled.

What is the best strategy for marshaling a map<> from native C++ through a CLI/CPP layer to
be consumed by a .Net Client?

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