c_str Return the url as a null-terminated string Synopsis const char* c_str() const noexcept; Defined in file <include/boost/url/url_base.hpp> on line 128 Description This function returns a pointer to a null terminated string representing the url, which may contain percent escapes. Example assert( std::strlen( url( "http://www.example.com" ).c_str() ) == 22 ); Complexity Constant. Exception Safety Throws nothing.