boost::urls::url_base::reserve Adjust the capacity without changing the size Synopsis Declared in header <boost/url/url_base.hpp> void reserve(std::size_t n); Description This function adjusts the capacity of the container in characters, without affecting the current contents. Has no effect if n<= this->capacity(). Strong guarantee. Calls to allocate may throw. Exceptions Name Thrown on Allocation failure Parameters Name Description n The capacity in characters, excluding any null terminator.