boost::urls::grammar::recycled_ptr::recycled_ptr Constructor Synopsis Declared in header <boost/url/grammar/recycled.hpp> recycled_ptr(std::nullptr_t) noexcept; Description After construction, this is empty and refers to a global recycle bin. recycled_ptr< std::string > ps( nullptr ); // Acquire a string and put it into a known state ps->acquire(); ps->clear(); &this->bin() != nullptr && this->empty() Throws nothing. See Also acquire , recycled , release .