[See also the file TODO_static_filters]

Concerning the main code:
-------------------------
- Policy for overlapping comparisons : another good (faster) solution
  would be to set a static boolean variable to indicate a buggy comparison
  happenned (a la IEEE inexact flags).  Drawback is that it's not thread safe,
  but could be made safe with pthread_key_create()...
  Clearly, all this stuff is policy.
    struct overlap_throw {
      void operator() const { throw(ce_qui_faut); }
    };
  Or :
    class overlap_static {
      static bool pipo = false;
    public:
      void operator() const { pipo = true; }
      void reset() const { pipo = false; }
    };
- Use expression templates for Interval_nt<> and Lazy_exact_nt<>.
- Specializations for is_zero() and co, and make use of them in the kernel.
  [Filtered_exact<> doesn't define them either, it's a bug...]
- SunPro 5.x supports Interval arithmetic...
  http://docs.sun.com/htmlcoll/coll.693.1/iso-8859-1/CPPARITHPROG/iapg_bookTOC.html
  http://www.sun.com/forte/cplusplus/interval/index.html;$sessionid$GSXJDFYAABWVTAMTA1FU45Q
- Try to get rid of the libc5 compatible version (make benchmarks first).
- Have determinant_by_formula() overloading for Lazy_exact_nt<> ?
  And what about for Interval_nt<> too ?
- Turn CGAL_IA_CHECK_RESTRICT into an [expensive] assertion ?
- Handle in_smallest_orthogonalcircle_ftC2.h correctly (needs an include)
- Bench -fbranch-probabilities ?  Use __builtin_expect() for GCC 3 ?
- Mark the cache as "mutable" (see Stroustrup, page 232) ?
- Filter_Cache: Faire des benchs, et une test-suite qui soit raisonnable.
  Hum, rajouter un booléen pour calculer le cache seulement sur demande ?
  (ça évite de le faire inutilement pour les variables intermédiaires,
  mais ça prend un chouia plus de place... mais en comparaison du reste...)
- Replace CGAL_IA_MAX_DOUBLE by standard DBL_MAX in <cfloat>, if portable
  (add a test).  Not possible for CGAL_IA_MIN_DOUBLE, since DBL_MIN is the
  _normalized_ minimum.
- See the C++ Standard numeric_limits<>, section 18.2.
? See ISO C99 and http://http.cs.berkeley.edu/~fateman/fp98/korenF/node3.html.
- "C9x FP unordered compares":
  +  /* ISO C99 IEEE Unordered compares.  */
  +  builtin_function ("__builtin_isgreater", default_function_type,
  +                   BUILT_IN_ISGREATER, BUILT_IN_NORMAL, NULL_PTR);
  +  builtin_function ("__builtin_isgreaterequal", default_function_type,
  +                   BUILT_IN_ISGREATEREQUAL, BUILT_IN_NORMAL, NULL_PTR);
  +  builtin_function ("__builtin_isless", default_function_type,
  +                   BUILT_IN_ISLESS, BUILT_IN_NORMAL, NULL_PTR);
  +  builtin_function ("__builtin_islessequal", default_function_type,
  +                   BUILT_IN_ISLESSEQUAL, BUILT_IN_NORMAL, NULL_PTR);
  +  builtin_function ("__builtin_islessgreater", default_function_type,
  +                   BUILT_IN_ISLESSGREATER, BUILT_IN_NORMAL, NULL_PTR);
  +  builtin_function ("__builtin_isunordered", default_function_type,
  +                   BUILT_IN_ISUNORDERED, BUILT_IN_NORMAL, NULL_PTR);
  [voir le draft C99 ce que c'est]

Concerning the doc:
-------------------
- In the 2.0 HTML doc, my enums are indexed twice.
  probably a cc_manual compliance bug from me.
  Idem, my fct to_double(Ia) is not the same as the others...
- add a pointer to my MISC'99 paper.
- DOCUMENT the new boolean template parameter, the script, the static filters.

Concerning the test-suite:
--------------------------
- Check it with GCOV again before the next public release.
- Make a more extensive test-suite for the filtered predicates.
  The script could output information to test them generically somehow.
- Test NaN propagation.  Comparisons with these should throw the exception...
  Check that they are correctly propagated (by min(), max(), even operator*...)