https://svn.lrde.epita.fr/svn/oln/trunk/static Index: ChangeLog from Roland Levillain &lt;roland(a)lrde.epita.fr&gt; Improve the static error messages of the virtual type retrieval mechanism. * stc/vtypes.hh (VIRTUAL_TYPE_MULTIPLY_DEFINED_AS_INTERNAL_AND_SINGLE) (VIRTUAL_TYPE_MULTIPLY_DEFINED_AS_INTERNAL_AND_EXTERNAL) (VIRTUAL_TYPE_MULTIPLY_DEFINED_AS_SINGLE_AND_EXTERNAL) (VIRTUAL_TYPE_MULTIPLY_DEFINED_AS_INTERNAL_AND_SINGLE_AND_EXTERNAL) (NO_VALID_VIRTUAL_TYPE_FOUND): New error messages. (select_typedef): Add specializations for erroneous cases. vtypes.hh | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 89 insertions(+), 2 deletions(-) Index: stc/vtypes.hh --- stc/vtypes.hh (revision 533) +++ stc/vtypes.hh (working copy) @@ -72,6 +72,12 @@ struct FIRST_PARAMETER_OF_rec_get_vtype_from_list_IS_NOT_A_TAG; struct THIRD_PARAMETER_OF_rec_get_vtype_from_list_IS_NOT_A_LIST; + struct VIRTUAL_TYPE_MULTIPLY_DEFINED_AS_INTERNAL_AND_SINGLE; + struct VIRTUAL_TYPE_MULTIPLY_DEFINED_AS_INTERNAL_AND_EXTERNAL; + struct VIRTUAL_TYPE_MULTIPLY_DEFINED_AS_SINGLE_AND_EXTERNAL; + struct VIRTUAL_TYPE_MULTIPLY_DEFINED_AS_INTERNAL_AND_SINGLE_AND_EXTERNAL; + struct NO_VALID_VIRTUAL_TYPE_FOUND; + struct NO_VALID_RETURN_TYPE_FOR_type_of_; } // end of namespace stc::ERROR @@ -646,7 +652,7 @@ typedef extended_vtype_candidate ret; \ }; \ \ - /** Special case. The typedef is <b>declared</b> as mlc::undefined */ \ + /** Special case: The typedef is <b>declared</b> as mlc::undefined */ \ /** in internal vtypes, and <b>defined</b> as a single vtype: good. */ \ template <typename single_vtype_candidate, \ typename extended_vtype_candidate> \ @@ -657,13 +663,94 @@ typedef single_vtype_candidate ret; \ }; \ \ + \ + /* Erroneous cases. */ \ + /* ---------------- */ \ + \ + /* In the following cases, mlc::abort_ ``statements'' take a dummy */ \ + /* typedef as first parameter, to prevent an immediate evaluation. */ \ + /* of mlc_abort_<>. */ \ + /* The choice was made to choose the first unbound parameter, but it */ \ + /* <i>it has no meaning in itself!</i>. This is just a part of the */ \ + /* static abortion mechanism. */ \ + \ + /** The typedef is <b>defined</b> both as internal and single (and */ \ + /** the internal flavour is <b>not</b> mlc::undefined): bad. */ \ + template <typename internal_vtype_candidate, \ + typename single_vtype_candidate, \ + typename extended_vtype_candidate> \ + struct select_typedef<internal_vtype_candidate, true, \ + single_vtype_candidate, true, \ + extended_vtype_candidate, false> : \ + mlc::abort_ < \ + internal_vtype_candidate /* dummy */ , \ + stc::ERROR::VIRTUAL_TYPE_MULTIPLY_DEFINED_AS_INTERNAL_AND_SINGLE \ + > \ + { \ + /* Error, not valid typedef found. */ \ + typedef mlc::not_found ret; \ + }; \ + \ + /** The typedef is <b>defined</b> both as internal and external: bad. */ \ + template <typename internal_vtype_candidate, \ + typename single_vtype_candidate, \ + typename extended_vtype_candidate> \ + struct select_typedef<internal_vtype_candidate, true, \ + single_vtype_candidate, false, \ + extended_vtype_candidate, true> : \ + mlc::abort_ < \ + internal_vtype_candidate /* dummy */ , \ + stc::ERROR::VIRTUAL_TYPE_MULTIPLY_DEFINED_AS_INTERNAL_AND_EXTERNAL \ + > \ + { \ + /* Error, not valid typedef found. */ \ + typedef mlc::not_found ret; \ + }; \ + \ + /** The typedef is <b>defined</b> both as single and external: bad. */ \ + template <typename internal_vtype_candidate, \ + typename single_vtype_candidate, \ + typename extended_vtype_candidate> \ + struct select_typedef<internal_vtype_candidate, false, \ + single_vtype_candidate, true, \ + extended_vtype_candidate, true> : \ + mlc::abort_ < \ + internal_vtype_candidate /* dummy */ , \ + stc::ERROR::VIRTUAL_TYPE_MULTIPLY_DEFINED_AS_SINGLE_AND_EXTERNAL \ + > \ + { \ + /* Error, not valid typedef found. */ \ + typedef mlc::not_found ret; \ + }; \ + \ + /** The typedef is <b>defined</b> as internal, single, and */ \ + /** external: bad. */ \ + template <typename internal_vtype_candidate, \ + typename single_vtype_candidate, \ + typename extended_vtype_candidate> \ + struct select_typedef<internal_vtype_candidate, true, \ + single_vtype_candidate, true, \ + extended_vtype_candidate, true> : \ + mlc::abort_ < \ + internal_vtype_candidate /* dummy */ , \ + stc::ERROR:: \ + VIRTUAL_TYPE_MULTIPLY_DEFINED_AS_INTERNAL_AND_SINGLE_AND_EXTERNAL \ + > \ + { \ + /* Error, not valid typedef found. */ \ + typedef mlc::not_found ret; \ + }; \ + \ /** Other cases: error (the typedef is not defined or defined more */ \ /** than once, hence \a mlc::not_found is returned). */ \ template \ < typename internal_vtype_candidate, bool found_as_internal_vtype, \ typename single_vtype_candidate, bool found_as_single_vtype, \ typename extended_vtype_candidate, bool found_as_extended_vtype > \ - struct select_typedef \ + struct select_typedef : \ + mlc::abort_ < \ + internal_vtype_candidate /* dummy */ , \ + stc::ERROR::NO_VALID_VIRTUAL_TYPE_FOUND > \ { \ /* Error, not valid typedef found. */ \ typedef mlc::not_found ret; \