More a list of what could be done, rather than what
should be done (which may be a much smaller list!).
-
Add back-end support for libdecNumber.
-
Add an adaptor back-end for complex number types.
-
Add better multiplication routines (Karatsuba, FFT etc) to cpp_int_backend.
-
Add assembly level routines to cpp_int_backend.
-
Can ring types (exact floating-point types) be supported? The answer
should be yes, but someone needs to write it, the hard part is IO and
binary-decimal conversion.
-
Should there be a choice of rounding mode (probably MPFR specific)?
-
We can reuse temporaries in multiple subtrees (temporary caching).
-
cpp_dec_float should round to nearest.
-
A 2's complement fixed precision int that uses exactly N bits and no
more.
Things requested in review:
-
The performances of mp_number<a_trivial_adaptor<float>, false>respect
to float and mp_number<a_trivial_adaptor<int>, false> and
int should be given to show the cost of using the generic interface (Mostly
done, just need to update docs to the latest results).
-
Should we provide min/max overloads for expression templates? (Not done
- we can't overload functions declared in the std namespace :-( ).
-
The rounding applied when converting must be documented (Done).
-
Document why we don't abstract out addition/multiplication algorithms
etc. (done - FAQ)
-
Document why we don't use proto (compile times) (Done).
-
We can reuse temporaries in multiple subtrees (temporary caching) Moved
to TODO list.
-
Emphasise in the docs that ET's may reorder operations (done 2012/10/31).
-
Document what happens to small fixed precision cpp_int's (done 2012/10/31).
-
The use of bool in template parameters could be improved by the use of
an enum class which will be more explicit. E.g
enum
class expression_template
{disabled, enabled}; enum class sign
{unsigned, signed}; (Partly done 2012/09/15, done 2012/10/31).
-
Each back-end should document the requirements it satisfies (not currently
scheduled for inclusion: it's deliberately an implementation detail,
and "optional" requirements are optimisations which can't be
detected by the user). Not done: this is an implementation detail, the
exact list of requirements satisfied is purely an optimization, not something
the user can detect.
-
A backend for an overflow aware integers (done 2012/10/31).
-
IIUC convert_to is used to emulate in c++98 compilers C++11 explicit
conversions. Could the explicit conversion operator be added on compilers
supporting it? (Done 2012/09/15).
-
The front-end should make the differences between implicit and explicit
construction (Done 2012/09/15).
-
The tutorial should add more examples concerning implicit or explicit
conversions. (Done 2012/09/15).
-
The documentation must explain how move semantics helps in this domain
and what the backend needs to do to profit from this optimization. (Done
2012/09/15).
-
The documentation should contain Throws specification on the mp_number
and backend requirements operations. (Done 2012/09/15).
-
The library interface should use the noexcept (noexcept, ...) facilities
(Done 2012/09/15).
-
It is unfortunate that the generic mp_number front end can not make use
constexpr as not all the backends can ensure this (done - we can go quite
a way).
-
literals: The library doesn't provide some kind of literals. I think
that the mp_number class should provide a way to create literals if the
backend is able to. (Done 2012/09/15).
-
The ExpresionTemplate parameter could be defaulted to a traits class
for more sensible defaults (done 2012/09/20).
-
In a = exp1 op exp2 where a occurs inside one of exp1 or exp2 then we
can optimise and eliminate one more temporary (done 2012/09/20).
-
Make fixed precision orthogonal to Allocator type in cpp_int. Possible
solution - add an additional MaxBits template argument that defaults
to 0 (meaning keep going till no more space/memory). Done.
-
Can ring types (exact floating-point types) be supported? The answer
should be yes, but someone needs to write it (Moved to TODO list).
-
Should there be a choice of rounding mode (probably MPFR specific)? Moved
to TODO list.
-
Make the exponent type for cpp_dec_float a template parameter, maybe
include support for big-integer exponents. Open question - what should
be the default - int32_t or int64_t? (done 2012/09/06)
-
Document the size requirements of fixed precision ints (done 2012/09/15).
-
Document std lib function accuracy (done 2012/09/15).
-
Be a bit clearer on the effects of sign-magnitude representation of cpp_int
- min == -max etc - done.
-
Document cpp_dec_float precision, rounding, and exponent size (done 2012/09/06).
-
Can we be clearer in the docs that mixed arithmetic doesn't work (no
longer applicable as of 2012/09/06)?
-
Document round functions behaviour better (they behave as in C++11) (added
note 2012/09/06).
-
Document limits on size of cpp_dec_float (done 2012/09/06).
-
Add support for fused multiply add (and subtract). GMP mpz_t could use
this (done 2012/09/20).
