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How to wrap C++ boost::variant in C++/CLI to grant access from .NET

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I am wrapping a C++ library to C++/CLI to call the functionality from .Net. The C++ library has a type using command = boost::variant<assignment, identifier, decimal> and wonder how to wrap it.

I searched the web but couldnt find anything. And idea is appreciated.

c++-cli boost-variant

share|improve this question

asked Mar 28 at 20:59

codingdavecodingdave

69166 silver badges1717 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  There is no practical way to map .NET generics onto C++ templates. Templates require all type arguments to be known at link-time, .NET generics are instantiated at runtime. You'd have to fumble an enum type in the wrapper's public interface to force the wrapper user to limit himself to the type parameters you are willing to support.
  
  – Hans Passant
  Mar 31 at 11:00
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you @HansPassant, I did solve the issue like this: For each variant type I have created a managed type and added an appropriate marshal_as function. My variant visitor then converts the native type inside the variant into its managed counterpart. Then I return the managed type as an System::Object handle. The good thing is that it works fine, the bad is that I always have to do typechecks on the managed side... I also thought about your enum idea and I do not see an advantage to use them. Can you please elaborate that?
  
  – codingdave
  Apr 3 at 11:42
  
  

  
  
  
  

add a comment
 | 

1

I am wrapping a C++ library to C++/CLI to call the functionality from .Net. The C++ library has a type using command = boost::variant<assignment, identifier, decimal> and wonder how to wrap it.

I searched the web but couldnt find anything. And idea is appreciated.

c++-cli boost-variant

share|improve this question

asked Mar 28 at 20:59

codingdavecodingdave

69166 silver badges1717 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  There is no practical way to map .NET generics onto C++ templates. Templates require all type arguments to be known at link-time, .NET generics are instantiated at runtime. You'd have to fumble an enum type in the wrapper's public interface to force the wrapper user to limit himself to the type parameters you are willing to support.
  
  – Hans Passant
  Mar 31 at 11:00
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you @HansPassant, I did solve the issue like this: For each variant type I have created a managed type and added an appropriate marshal_as function. My variant visitor then converts the native type inside the variant into its managed counterpart. Then I return the managed type as an System::Object handle. The good thing is that it works fine, the bad is that I always have to do typechecks on the managed side... I also thought about your enum idea and I do not see an advantage to use them. Can you please elaborate that?
  
  – codingdave
  Apr 3 at 11:42
  
  

  
  
  
  

add a comment
 | 

I am wrapping a C++ library to C++/CLI to call the functionality from .Net. The C++ library has a type using command = boost::variant<assignment, identifier, decimal> and wonder how to wrap it.

I searched the web but couldnt find anything. And idea is appreciated.

c++-cli boost-variant

share|improve this question

asked Mar 28 at 20:59

codingdavecodingdave

69166 silver badges1717 bronze badges

share|improve this question

asked Mar 28 at 20:59

codingdavecodingdave

69166 silver badges1717 bronze badges

share|improve this question

asked Mar 28 at 20:59

codingdavecodingdave

69166 silver badges1717 bronze badges

asked Mar 28 at 20:59

codingdavecodingdave

69166 silver badges1717 bronze badges

asked Mar 28 at 20:59

codingdavecodingdave

69166 silver badges1717 bronze badges