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26<div class="titlepage"><div><div><h3 class="title">
27<a name="boost_multiprecision.map.todo"></a><a class="link" href="todo.html" title="TODO">TODO</a>
28</h3></div></div></div>
29<p>
30 More a list of what <span class="emphasis"><em>could</em></span> be done, rather than what
31 <span class="emphasis"><em>should</em></span> be done (which may be a much smaller list!).
32 </p>
33<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
34<li class="listitem">
35 Add back-end support for libdecNumber.
36 </li>
37<li class="listitem">
38 Add an adaptor back-end for complex number types.
39 </li>
40<li class="listitem">
41 Add better multiplication routines (Karatsuba, FFT etc) to cpp_int_backend.
42 </li>
43<li class="listitem">
44 Add assembly level routines to cpp_int_backend.
45 </li>
46<li class="listitem">
47 Can ring types (exact floating-point types) be supported? The answer
48 should be yes, but someone needs to write it, the hard part is IO and
49 binary-decimal conversion.
50 </li>
51<li class="listitem">
52 Should there be a choice of rounding mode (probably MPFR specific)?
53 </li>
54<li class="listitem">
55 We can reuse temporaries in multiple subtrees (temporary caching).
56 </li>
57<li class="listitem">
58 cpp_dec_float should round to nearest.
59 </li>
60<li class="listitem">
61 A 2's complement fixed precision int that uses exactly N bits and no
62 more.
63 </li>
64</ul></div>
65<p>
66 Things requested in review:
67 </p>
68<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
69<li class="listitem">
70 The performances of mp_number&lt;a_trivial_adaptor&lt;float&gt;, false&gt;respect
71 to float and mp_number&lt;a_trivial_adaptor&lt;int&gt;, false&gt; and
72 int should be given to show the cost of using the generic interface (Mostly
73 done, just need to update docs to the latest results).
74 </li>
75<li class="listitem">
76 Should we provide min/max overloads for expression templates? (Not done
77 - we can't overload functions declared in the std namespace :-( ).
78 </li>
79<li class="listitem">
80 The rounding applied when converting must be documented (Done).
81 </li>
82<li class="listitem">
83 Document why we don't abstract out addition/multiplication algorithms
84 etc. (done - FAQ)
85 </li>
86<li class="listitem">
87 Document why we don't use proto (compile times) (Done).
88 </li>
89<li class="listitem">
90 We can reuse temporaries in multiple subtrees (temporary caching) Moved
91 to TODO list.
92 </li>
93<li class="listitem">
94 Emphasise in the docs that ET's may reorder operations (done 2012/10/31).
95 </li>
96<li class="listitem">
97 Document what happens to small fixed precision cpp_int's (done 2012/10/31).
98 </li>
99<li class="listitem">
100 The use of bool in template parameters could be improved by the use of
101 an enum class which will be more explicit. E.g <code class="computeroutput"><span class="keyword">enum</span>
102 <span class="keyword">class</span> <span class="identifier">expression_template</span>
103 <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>
104 <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).
105 </li>
106<li class="listitem">
107 Each back-end should document the requirements it satisfies (not currently
108 scheduled for inclusion: it's deliberately an implementation detail,
109 and "optional" requirements are optimisations which can't be
110 detected by the user). Not done: this is an implementation detail, the
111 exact list of requirements satisfied is purely an optimization, not something
112 the user can detect.
113 </li>
114<li class="listitem">
115 A backend for an overflow aware integers (done 2012/10/31).
116 </li>
117<li class="listitem">
118 IIUC convert_to is used to emulate in c++98 compilers C++11 explicit
119 conversions. Could the explicit conversion operator be added on compilers
120 supporting it? (Done 2012/09/15).
121 </li>
122<li class="listitem">
123 The front-end should make the differences between implicit and explicit
124 construction (Done 2012/09/15).
125 </li>
126<li class="listitem">
127 The tutorial should add more examples concerning implicit or explicit
128 conversions. (Done 2012/09/15).
129 </li>
130<li class="listitem">
131 The documentation must explain how move semantics helps in this domain
132 and what the backend needs to do to profit from this optimization. (Done
133 2012/09/15).
134 </li>
135<li class="listitem">
136 The documentation should contain Throws specification on the mp_number
137 and backend requirements operations. (Done 2012/09/15).
138 </li>
139<li class="listitem">
140 The library interface should use the noexcept (BOOST_NOEXCEPT, ...) facilities
141 (Done 2012/09/15).
142 </li>
143<li class="listitem">
144 It is unfortunate that the generic mp_number front end can not make use
145 constexpr as not all the backends can ensure this (done - we can go quite
146 a way).
147 </li>
148<li class="listitem">
149 literals: The library doesn't provide some kind of literals. I think
150 that the mp_number class should provide a way to create literals if the
151 backend is able to. (Done 2012/09/15).
152 </li>
153<li class="listitem">
154 The ExpresionTemplate parameter could be defaulted to a traits class
155 for more sensible defaults (done 2012/09/20).
156 </li>
157<li class="listitem">
158 In a = exp1 op exp2 where a occurs inside one of exp1 or exp2 then we
159 can optimise and eliminate one more temporary (done 2012/09/20).
160 </li>
161</ul></div>
162<h5>
163<a name="boost_multiprecision.map.todo.h0"></a>
164 <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
165 Comments</a>
166 </h5>
167<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
168<li class="listitem">
169 Make fixed precision orthogonal to Allocator type in cpp_int. Possible
170 solution - add an additional MaxBits template argument that defaults
171 to 0 (meaning keep going till no more space/memory). Done.
172 </li>
173<li class="listitem">
174 Can ring types (exact floating-point types) be supported? The answer
175 should be yes, but someone needs to write it (Moved to TODO list).
176 </li>
177<li class="listitem">
178 Should there be a choice of rounding mode (probably MPFR specific)? Moved
179 to TODO list.
180 </li>
181<li class="listitem">
182 Make the exponent type for cpp_dec_float a template parameter, maybe
183 include support for big-integer exponents. Open question - what should
184 be the default - int32_t or int64_t? (done 2012/09/06)
185 </li>
186<li class="listitem">
187 Document the size requirements of fixed precision ints (done 2012/09/15).
188 </li>
189<li class="listitem">
190 Document std lib function accuracy (done 2012/09/15).
191 </li>
192<li class="listitem">
193 Be a bit clearer on the effects of sign-magnitude representation of cpp_int
194 - min == -max etc - done.
195 </li>
196<li class="listitem">
197 Document cpp_dec_float precision, rounding, and exponent size (done 2012/09/06).
198 </li>
199<li class="listitem">
200 Can we be clearer in the docs that mixed arithmetic doesn't work (no
201 longer applicable as of 2012/09/06)?
202 </li>
203<li class="listitem">
204 Document round functions behaviour better (they behave as in C++11) (added
205 note 2012/09/06).
206 </li>
207<li class="listitem">
208 Document limits on size of cpp_dec_float (done 2012/09/06).
209 </li>
210<li class="listitem">
211 Add support for fused multiply add (and subtract). GMP mpz_t could use
212 this (done 2012/09/20).
213 </li>
214</ul></div>
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