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Make from_stream and to_stream customization points

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Howard Hinnant 2017-07-27 21:27:14 -04:00
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d0355r4.html
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@ -37,7 +37,7 @@
Document number: D0355R4<br>
<br>
<a href="mailto:howard.hinnant@gmail.com">Howard E. Hinnant</a><br>
2017-07-17<br>
2017-07-27<br>
</address>
<hr>
<h1>Extending <code>&lt;chrono&gt;</code> to Calendars and Time Zones</h1>
@ -59,7 +59,9 @@ Document number: D0355R4<br>
<h3>Changes since <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0355r3.html">R3</a></h3>
<ul>
<li>Make the database singleton a <code>list&lt;tzdb&gt;</code> instead of a single <code>tzdb</code>.</li>
<li>Make <code>from_stream</code> and <code>to_stream</code> customization points.</li>
<li>Make the database singleton a <code>list&lt;tzdb&gt;</code>
instead of a single <code>tzdb</code>.</li>
<li>Rewrite in terms of <code>string_view</code>.</li>
<li>Improve spec for operator-(const year_month&amp; x, const year_month&amp; y).</li>
<li>Refine constraints on conversions from calendar types to sys_days.</li>
@ -3016,6 +3018,12 @@ Add a new section 23.17.8 Formatting [time.format]:
<h3>23.17.8 Formatting [time.format]</h3>
<p>
Each <code>format</code> overload specified in this section calls <code>to_stream</code>
unqualified, so as to enable argument dependent lookup ([basic.lookup.argdep]).
</p>
<pre>
template &lt;class charT, class Streamable&gt;
basic_string&lt;charT&gt;
@ -3397,6 +3405,11 @@ Add a new section 23.17.9 Parsing [time.parse]:
<h3>23.17.9 Parsing [time.parse]</h3>
<p>
Each <code>parse</code> overload specified in this section calls <code>from_stream</code>
unqualified, so as to enable argument dependent lookup ([basic.lookup.argdep]).
</p>
<pre>
template &lt;class charT, class traits, class Alloc, class Parsable&gt;
<i>unspecified</i>
@ -3493,8 +3506,11 @@ matches zero or more white space characters in the input stream.
</p>
<p>
If the <code>from_stream</code> overload fails to parse everything specified by the
format string, <code>ios_base::failbit</code> is set in the <code>basic_istream</code>.
If the <code>from_stream</code> overload fails to parse everything
specified by the format string, or if insufficient information is
parsed to specify a complete duration, time point, or calendrical data
structure, <code>ios_base::failbit</code> is set in the
<code>basic_istream</code>.
</p>
<blockquote>
@ -3702,7 +3718,7 @@ permitted but not required.</td>
<td>The weekday as a decimal number (0-6), where Sunday is 0. The modified command
<code>%Nw</code> where <code>N</code> is a positive decimal integer specifies the maximum
number of characters to read. If not specified, the default is 1. Leading zeroes are
permitted but not required. The modified command <code>%Ou</code> interprets the locale's
permitted but not required. The modified command <code>%Ow</code> interprets the locale's
alternative representation.</td>
</tr>