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| <div class="section"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="boost_multiprecision.map.todo"></a><a class="link" href="todo.html" title="TODO">TODO</a> |
| </h3></div></div></div> |
| <p> |
| More a list of what <span class="emphasis"><em>could</em></span> be done, rather than what |
| <span class="emphasis"><em>should</em></span> be done (which may be a much smaller list!). |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> |
| <li class="listitem"> |
| Add back-end support for libdecNumber. |
| </li> |
| <li class="listitem"> |
| Add an adaptor back-end for complex number types. |
| </li> |
| <li class="listitem"> |
| Add better multiplication routines (Karatsuba, FFT etc) to cpp_int_backend. |
| </li> |
| <li class="listitem"> |
| Add assembly level routines to cpp_int_backend. |
| </li> |
| <li class="listitem"> |
| 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. |
| </li> |
| <li class="listitem"> |
| Should there be a choice of rounding mode (probably MPFR specific)? |
| </li> |
| <li class="listitem"> |
| We can reuse temporaries in multiple subtrees (temporary caching). |
| </li> |
| <li class="listitem"> |
| cpp_dec_float should round to nearest. |
| </li> |
| <li class="listitem"> |
| A 2's complement fixed precision int that uses exactly N bits and no |
| more. |
| </li> |
| </ul></div> |
| <p> |
| Things requested in review: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> |
| <li class="listitem"> |
| 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). |
| </li> |
| <li class="listitem"> |
| Should we provide min/max overloads for expression templates? (Not done |
| - we can't overload functions declared in the std namespace :-( ). |
| </li> |
| <li class="listitem"> |
| The rounding applied when converting must be documented (Done). |
| </li> |
| <li class="listitem"> |
| Document why we don't abstract out addition/multiplication algorithms |
| etc. (done - FAQ) |
| </li> |
| <li class="listitem"> |
| Document why we don't use proto (compile times) (Done). |
| </li> |
| <li class="listitem"> |
| We can reuse temporaries in multiple subtrees (temporary caching) Moved |
| to TODO list. |
| </li> |
| <li class="listitem"> |
| Emphasise in the docs that ET's may reorder operations (done 2012/10/31). |
| </li> |
| <li class="listitem"> |
| Document what happens to small fixed precision cpp_int's (done 2012/10/31). |
| </li> |
| <li class="listitem"> |
| The use of bool in template parameters could be improved by the use of |
| an enum class which will be more explicit. E.g <code class="computeroutput"><span class="keyword">enum</span> |
| <span class="keyword">class</span> <span class="identifier">expression_template</span> |
| <span class="special">{</span><span class="identifier">disabled</span><span class="special">,</span> <span class="identifier">enabled</span><span class="special">};</span> <span class="keyword">enum</span> <span class="keyword">class</span> <span class="identifier">sign</span> |
| <span class="special">{</span><span class="keyword">unsigned</span><span class="special">,</span> <span class="keyword">signed</span><span class="special">};</span></code> (Partly done 2012/09/15, done 2012/10/31). |
| </li> |
| <li class="listitem"> |
| 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. |
| </li> |
| <li class="listitem"> |
| A backend for an overflow aware integers (done 2012/10/31). |
| </li> |
| <li class="listitem"> |
| 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). |
| </li> |
| <li class="listitem"> |
| The front-end should make the differences between implicit and explicit |
| construction (Done 2012/09/15). |
| </li> |
| <li class="listitem"> |
| The tutorial should add more examples concerning implicit or explicit |
| conversions. (Done 2012/09/15). |
| </li> |
| <li class="listitem"> |
| 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). |
| </li> |
| <li class="listitem"> |
| The documentation should contain Throws specification on the mp_number |
| and backend requirements operations. (Done 2012/09/15). |
| </li> |
| <li class="listitem"> |
| The library interface should use the noexcept (BOOST_NOEXCEPT, ...) facilities |
| (Done 2012/09/15). |
| </li> |
| <li class="listitem"> |
| 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). |
| </li> |
| <li class="listitem"> |
| 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). |
| </li> |
| <li class="listitem"> |
| The ExpresionTemplate parameter could be defaulted to a traits class |
| for more sensible defaults (done 2012/09/20). |
| </li> |
| <li class="listitem"> |
| 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). |
| </li> |
| </ul></div> |
| <h5> |
| <a name="boost_multiprecision.map.todo.h0"></a> |
| <span class="phrase"><a name="boost_multiprecision.map.todo.pre_review_comments"></a></span><a class="link" href="todo.html#boost_multiprecision.map.todo.pre_review_comments">Pre-Review |
| Comments</a> |
| </h5> |
| <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> |
| <li class="listitem"> |
| 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. |
| </li> |
| <li class="listitem"> |
| Can ring types (exact floating point types) be supported? The answer |
| should be yes, but someone needs to write it (Moved to TODO list). |
| </li> |
| <li class="listitem"> |
| Should there be a choice of rounding mode (probably MPFR specific)? Moved |
| to TODO list. |
| </li> |
| <li class="listitem"> |
| 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) |
| </li> |
| <li class="listitem"> |
| Document the size requirements of fixed precision ints (done 2012/09/15). |
| </li> |
| <li class="listitem"> |
| Document std lib function accuracy (done 2012/09/15). |
| </li> |
| <li class="listitem"> |
| Be a bit clearer on the effects of sign-magnitude representation of cpp_int |
| - min == -max etc - done. |
| </li> |
| <li class="listitem"> |
| Document cpp_dec_float precision, rounding, and exponent size (done 2012/09/06). |
| </li> |
| <li class="listitem"> |
| Can we be clearer in the docs that mixed arithmetic doesn't work (no |
| longer applicable as of 2012/09/06)? |
| </li> |
| <li class="listitem"> |
| Document round functions behaviour better (they behave as in C++11) (added |
| note 2012/09/06). |
| </li> |
| <li class="listitem"> |
| Document limits on size of cpp_dec_float (done 2012/09/06). |
| </li> |
| <li class="listitem"> |
| Add support for fused multiply add (and subtract). GMP mpz_t could use |
| this (done 2012/09/20). |
| </li> |
| </ul></div> |
| </div> |
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| file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) |
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