#125: Ambiguity in comparaison with literals --------------------------------+------------------------------------------- Reporter: garrigues | Owner: theo Type: defect | Status: new Priority: major | Milestone: Olena 1.0ß Component: Milena | Version: 1.0 Keywords: literals operators | --------------------------------+------------------------------------------- This test shows the problem : {{{ #!cpp # include <mln/value/gl8.hh> # include <mln/literal/all.hh> int main() { using mln::value::gl8; using mln::literal::white; gl8 b; b == white; } }}} The compiler can't find the right operator== to compate graylevel with literals. Here is the error output : {{{ test.cc: In function 'int main()': test.cc:11: error: ISO C++ says that these are ambiguous, even though the worst conversion for the first is better than the worst conversion for the second: ../../mln/literal/ops.hh:252: note: candidate 1: typename mln::trait::op::eq<O, O>::ret mln::operator==(const mln::Object<E>&, const mln::Literal<L>&) [with O = mln::value::graylevel<8u>, L = mln::literal::white_t] ../../mln/value/internal/gray_f.hh:317: note: candidate 2: bool mln::value::operator==(const mln::value::Integer<I>&, const mln::value::graylevel_f&) [with I = mln::value::graylevel<8u>] }}} -- Ticket URL: <https://trac.lrde.epita.fr/olena/ticket/125> Olena <http://olena.lrde.epita.fr> Olena, a generic and efficient C++ image library.