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- <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>
- <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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