size Return the number of characters in the url Synopsis size_t size() const noexcept; Defined in file <include/boost/url/url_view_base.hpp> on line 165 Description This function returns the number of characters in the url's encoded string, not including any null terminator, if present. Example assert( url_view( "file:///Program%20Files" ).size() == 23 ); Complexity Constant. Exception Safety Throws nothing.