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231 lines
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_multiprecision.map.todo"></a><a class="link" href="todo.html" title="TODO">TODO</a>
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</h3></div></div></div>
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<p>
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More a list of what <span class="emphasis"><em>could</em></span> be done, rather than what
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<span class="emphasis"><em>should</em></span> be done (which may be a much smaller list!).
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</p>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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Add back-end support for libdecNumber.
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</li>
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<li class="listitem">
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Add an adaptor back-end for complex number types.
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</li>
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<li class="listitem">
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Add better multiplication routines (Karatsuba, FFT etc) to cpp_int_backend.
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</li>
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<li class="listitem">
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Add assembly level routines to cpp_int_backend.
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</li>
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<li class="listitem">
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Can ring types (exact floating-point types) be supported? The answer
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should be yes, but someone needs to write it, the hard part is IO and
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binary-decimal conversion.
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</li>
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<li class="listitem">
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Should there be a choice of rounding mode (probably MPFR specific)?
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</li>
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<li class="listitem">
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We can reuse temporaries in multiple subtrees (temporary caching).
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</li>
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<li class="listitem">
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cpp_dec_float should round to nearest.
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</li>
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<li class="listitem">
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A 2's complement fixed precision int that uses exactly N bits and no
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more.
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</li>
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</ul></div>
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<p>
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Things requested in review:
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</p>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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The performances of mp_number<a_trivial_adaptor<float>, false>respect
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to float and mp_number<a_trivial_adaptor<int>, false> and
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int should be given to show the cost of using the generic interface (Mostly
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done, just need to update docs to the latest results).
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</li>
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<li class="listitem">
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Should we provide min/max overloads for expression templates? (Not done
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- we can't overload functions declared in the std namespace :-( ).
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</li>
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<li class="listitem">
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The rounding applied when converting must be documented (Done).
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</li>
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<li class="listitem">
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Document why we don't abstract out addition/multiplication algorithms
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etc. (done - FAQ)
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</li>
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<li class="listitem">
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Document why we don't use proto (compile times) (Done).
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</li>
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<li class="listitem">
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We can reuse temporaries in multiple subtrees (temporary caching) Moved
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to TODO list.
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</li>
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<li class="listitem">
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Emphasise in the docs that ET's may reorder operations (done 2012/10/31).
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</li>
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<li class="listitem">
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Document what happens to small fixed precision cpp_int's (done 2012/10/31).
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</li>
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<li class="listitem">
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The use of bool in template parameters could be improved by the use of
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an enum class which will be more explicit. E.g <code class="computeroutput"><span class="keyword">enum</span>
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<span class="keyword">class</span> <span class="identifier">expression_template</span>
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<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>
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<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).
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</li>
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<li class="listitem">
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Each back-end should document the requirements it satisfies (not currently
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scheduled for inclusion: it's deliberately an implementation detail,
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and "optional" requirements are optimisations which can't be
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detected by the user). Not done: this is an implementation detail, the
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exact list of requirements satisfied is purely an optimization, not something
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the user can detect.
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</li>
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<li class="listitem">
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A backend for an overflow aware integers (done 2012/10/31).
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</li>
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<li class="listitem">
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IIUC convert_to is used to emulate in c++98 compilers C++11 explicit
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conversions. Could the explicit conversion operator be added on compilers
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supporting it? (Done 2012/09/15).
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</li>
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<li class="listitem">
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The front-end should make the differences between implicit and explicit
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construction (Done 2012/09/15).
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</li>
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<li class="listitem">
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The tutorial should add more examples concerning implicit or explicit
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conversions. (Done 2012/09/15).
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</li>
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<li class="listitem">
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The documentation must explain how move semantics helps in this domain
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and what the backend needs to do to profit from this optimization. (Done
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2012/09/15).
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</li>
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<li class="listitem">
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The documentation should contain Throws specification on the mp_number
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and backend requirements operations. (Done 2012/09/15).
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</li>
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<li class="listitem">
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The library interface should use the noexcept (BOOST_NOEXCEPT, ...) facilities
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(Done 2012/09/15).
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</li>
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<li class="listitem">
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It is unfortunate that the generic mp_number front end can not make use
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constexpr as not all the backends can ensure this (done - we can go quite
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a way).
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</li>
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<li class="listitem">
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literals: The library doesn't provide some kind of literals. I think
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that the mp_number class should provide a way to create literals if the
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backend is able to. (Done 2012/09/15).
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</li>
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<li class="listitem">
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The ExpresionTemplate parameter could be defaulted to a traits class
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for more sensible defaults (done 2012/09/20).
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</li>
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<li class="listitem">
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In a = exp1 op exp2 where a occurs inside one of exp1 or exp2 then we
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can optimise and eliminate one more temporary (done 2012/09/20).
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</li>
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</ul></div>
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<h5>
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<a name="boost_multiprecision.map.todo.h0"></a>
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<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
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Comments</a>
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</h5>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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Make fixed precision orthogonal to Allocator type in cpp_int. Possible
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solution - add an additional MaxBits template argument that defaults
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to 0 (meaning keep going till no more space/memory). Done.
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</li>
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<li class="listitem">
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Can ring types (exact floating-point types) be supported? The answer
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should be yes, but someone needs to write it (Moved to TODO list).
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</li>
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<li class="listitem">
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Should there be a choice of rounding mode (probably MPFR specific)? Moved
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to TODO list.
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</li>
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<li class="listitem">
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Make the exponent type for cpp_dec_float a template parameter, maybe
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include support for big-integer exponents. Open question - what should
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be the default - int32_t or int64_t? (done 2012/09/06)
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</li>
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<li class="listitem">
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Document the size requirements of fixed precision ints (done 2012/09/15).
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</li>
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<li class="listitem">
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Document std lib function accuracy (done 2012/09/15).
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</li>
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<li class="listitem">
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Be a bit clearer on the effects of sign-magnitude representation of cpp_int
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- min == -max etc - done.
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</li>
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<li class="listitem">
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Document cpp_dec_float precision, rounding, and exponent size (done 2012/09/06).
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</li>
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<li class="listitem">
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Can we be clearer in the docs that mixed arithmetic doesn't work (no
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longer applicable as of 2012/09/06)?
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</li>
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<li class="listitem">
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Document round functions behaviour better (they behave as in C++11) (added
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note 2012/09/06).
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</li>
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<li class="listitem">
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Document limits on size of cpp_dec_float (done 2012/09/06).
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</li>
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<li class="listitem">
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Add support for fused multiply add (and subtract). GMP mpz_t could use
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this (done 2012/09/20).
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</li>
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</ul></div>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2002-2019 John Maddock
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and Christopher Kormanyos<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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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</p>
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</div></td>
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</tr></table>
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<hr>
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