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Converting a project from Codeblocks to Visual Studio I encountered this puzzling error from the compiler:

Error 4 error C2228: left of '.swap' must have class/struct/union shared_ptr.hpp Error 3 error C2440: '<function-style-cast>' : cannot convert from 'boost::shared_ptr<T>' to 'boost::shared_ptr<T>' shared_ptr.hpp 384

Here's the code in question in boost's shared_ptr.hpp

template<class Y> shared_ptr & operator=( shared_ptr<Y> && r ) // never throws { this_type( static_cast< shared_ptr<Y> && >( r ) ).swap( *this ); return *this; }

I set up a similar but less complicated project and did not get the same error.

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    Could you provide the code where you assign an r-value to a shared_ptr of some sort, and provide the types involved. Commented Nov 26, 2011 at 18:00
  • shared_ptr is used all over the place, I'll check through all assignments to see if I made a mistake Commented Nov 28, 2011 at 9:43

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You probably try to swap two shared_ptr of incompatible types. Make sure that the two shared_ptr point to objects of the same/convertible type.

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