Boost::shared_ptr and nullptr in default template function argument?

This will works with std::shared_ptr instead of boost::shared_ptr I think.

According to boost.org/doc/libs/1_52_0/libs/smart_ptr... , boost::shared_ptr cannot be initialized by a null pointer constant because for the pointer-taking constructor, it is templated by Y* where Y is a template parameter. A conversion of a null pointer constant to Y* is not considered when deducing Y*, so that constructor will have a deduction failure and is ignored when passing nullptr.

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