/in/foo.cc: In member function 'algo::UDI::operator uint64_t() const':
/in/foo.cc:56:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                 for (size_t i = 19; i != -1; --i)
                                     ~~^~~~~
/in/foo.cc: In member function 'bool algo::UDI::operator<=(const algo::UDI&) const':
/in/foo.cc:103:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (size_t i = u.data.size() - 1; i != -1; --i)
                                                ~~^~~~~
/in/foo.cc: In function 'std::pair<algo::UDI, long unsigned int> algo::operator/(const algo::UDI&, uint64_t)':
/in/foo.cc:246:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (size_t i = a.data.size() - 1; i != -1; --i)
                                            ~~^~~~~
/tmp/ccby1XpI.o: In function `main':
foo.cc:(.text.startup+0x7e): undefined reference to `algo::UDI::UINT64_RAW_STR'
foo.cc:(.text.startup+0x717): undefined reference to `algo::UDI::UINT64_RAW_STR'
foo.cc:(.text.startup+0x76f): undefined reference to `algo::UDI::UINT64_RAW_STR'
foo.cc:(.text.startup+0x937): undefined reference to `algo::UDI::UINT64_RAW_STR'
foo.cc:(.text.startup+0x976): undefined reference to `algo::UDI::UINT64_RAW_STR'
/tmp/ccby1XpI.o:foo.cc:(.text.startup+0x9b7): more undefined references to `algo::UDI::UINT64_RAW_STR' follow
collect2: error: ld returned 1 exit status