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<div class="moz-cite-prefix">On 01/05/2015 04:29 PM, Nelson, Clark
wrote:<br>
</div>
<blockquote
cite="mid:38C37E44FD352B44ABFC58410B0790D07EB75F42@ORSMSX103.amr.corp.intel.com"
type="cite">
<pre wrap="">Here's an updated document.
Summarizing recent discussion:
With respect to N4267 (u8 character literals), we have now had three macro
name proposals:
__cpp_utf8_char_literals
__cpp_unicode_literals
__cpp_unicode_characters
The latter two, of course, update the value of a macro from C++11. I'm
inclined to guess that this is going to be considered a small enough tweak
that introducing a new macro name (such as the first) would not be
justified.
People have talked about how unfortunate it is that the C++11
recommendations use two different macro names for such closely related
features. So far, I have not interpreted this is an actual proposal to
change SD-6 -- it seems like noodling up to this point. But if someone
wants to produce a concrete proposal along these lines, we can certainly
consider it.
But I also want to point out that there are nine other C++17 papers for
which no proposal has yet been made.
For N4190 (removing old stuff) and N4258 (cleaning up noexcept), if no one
from SG10 makes a proposal pretty soon, I'm going to contact the authors to
see what kind of ideas they have.
--
Clark Nelson Chair, PL22.16 (ANSI C++ standard committee)
Intel Corporation Chair, SG10 (C++ SG for feature-testing)
<a class="moz-txt-link-abbreviated" href="mailto:clark.nelson@intel.com">clark.nelson@intel.com</a> Chair, CPLEX (C SG for parallel language extensions)
</pre>
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</pre>
</blockquote>
<br>
<tt>Finally looking at</tt><tt><br>
</tt><tt>N4258: Cleaning-up noexcept in the Library</tt><tt><br>
</tt><tt>The only thing I can think of that would be helpful is</tt><tt><br>
</tt><tt>__cpp_lib_allocator_</tt><tt>is_always_equal</tt><tt><br>
</tt><tt><br>
</tt><tt>I think the actual application of noexcept to all the
various containers don't lend themselves to a macro in a way that
would help migration. It seems the customization of
is_always_equal is used inside noexcept to set the exception
policy. If __cpp_lib_allocator_is_always_equal is defined you
know you have to provide and set non-default is_always_equal for
user-defined stateful allocators.</tt><tt> Similarly,
user-defined containers could use the macro to migrate noexcept
specification for their container methods.<br>
</tt><tt><br>
</tt><tt><br>
</tt><tt>In my last email I was thinking out loud and maybe it
looked chaotic to me this morning.<br>
I would like to summarize my favored approaches:</tt><tt><br>
</tt>
<pre wrap="">N4267 (u8 character literals)
        __cpp_unicode_characters                201411
N4190 (removing old stuff)
<pre>        __cpp_lib_remove_auto_ptr                201411
        __cpp_lib_remove_random_shuffle                201411
        __cpp_lib_remove_deprecated_functionals        201411</pre><pre>        __cpp_lib_remove_deprecated_bind        201411</pre></pre>
<tt>These would get date bumps if/when std::not_fun etc. or
std::bind is removed.</tt><tt><br>
I am slightly annoyed that the fist two don't have _deprecated_
but they look nice to me as they are.<br>
</tt><tt><br>
</tt><tt><br>
</tt><tt>N4279 - Improved insertion interface for unique-key maps</tt><tt><br>
</tt>
<pre>        __cpp_lib_map_insertion                        201411</pre>
<pre>        __cpp_lib_unordered_map_insertion        201411</pre>
<tt><br>
</tt><tt>N4051</tt><tt> Allow typename in a template template
parameter</tt><tt><br>
</tt>
<pre>        __cpp_typename_in_template_template_parm        201411
</pre>
<tt>This may be too little to mess with.</tt><br>
<br>
<tt><br>
</tt><tt>N4268 - Allow constant evaluation for all non-type template
arguments</tt><tt><br>
</tt>
<pre>__cpp_const_eval_of_non_type_template_args</pre>
<tt> </tt><tt><br>
</tt><tt> </tt><tt><br>
</tt><tt>N4230 - Nested namespace definition</tt><tt><br>
</tt>
<pre>        __cpp_nested_namespace_definitions        201411
</pre>
<tt>I like this better than __cpp_nested_namespaces that I had
before.
</tt><br>
<tt><br>
<br>
</tt><tt>N3922 - </tt><tt>New Rules for auto deduction from
braced-init-list</tt><tt><br>
</tt>
<pre>        __cpp_auto_deduction                        200604                for C++11</pre>
<tt></tt>
<pre>        __cpp_auto_deduction                        201411                for C++17</pre>
<pre>This could be an alternate spelling of <code>__cpp_return_type_deduction</code>:
        __cpp_auto_deduction                        201304                for C++14</pre>
<tt><br>
</tt><tt>Ed<br>
<br>
<br>
</tt>
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