visual studio 2010 - C++/CLI "could not import member" warning when using shared_ptr as argument -

i have following interface in c++/cli:

public interface class isharedptrinterface {     void printsharedptr(std::shared_ptr<std::wstring> ptr); }; 

which implemented follows:

public ref class sharedptrclass : public isharedptrinterface { public:     virtual void printsharedptr(std::shared_ptr<std::wstring> ptr)     {         system::console::writeline(gcnew system::string(ptr->c_str()));     }; }; 

compiling in visual studio 2010, following warning:

1>testsharedptrinterface.cpp(8): warning c4679: 'isharedptrinterface::printsharedptr' : not import member   1>          diagnostic occurred while importing type 'isharedptrinterface ' assembly 'anotherclrproject, version=0.0.0.0, culture=neutral, publickeytoken=null'. 

if run compiled method, following runtime error:

method 'printsharedptr' in type 'sharedptrclass' assembly 'clrproject, version=0.0.0.0, culture=neutral, publickeytoken=null' not have implementation.

the error not occur if using straight std::wstring in interface/implementation. can explain why?

many thanks!

you mixing native , managed types @ public interface level. is, in case have public managed interface method takes native types parameter. in general, isn't great idea, since can't use these methods managed language c# since can't supply native type.

the problem here has visibility of native types: default native types private. when tries import isharedptrinterface::printsharedptr needs have have access interface (which since public) , access parameter types.

you can mark native types public using make_public or directly marking them public (when compiling /clr).

the problem there no way make templated types public (make_public not work on them).

see:

• best workaround compiler error c2158: make_public not support native template types
• https://stackoverflow.com/a/9213016/495262