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Tighten up year_month_weekday and year_month_weekday_last:

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* conversions to sys_days.
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Howard Hinnant
2017-06-29 21:06:53 -04:00
parent 609dd49934
commit cd888b2928
1 changed files with 13 additions and 9 deletions
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22
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>
2017-06-27<br>
2017-06-29<br>
</address>
<hr>
<h1>Extending <code>&lt;chrono&gt;</code> to Calendars and Time Zones</h1>
@@ -59,6 +59,8 @@ 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><ins>Rewrite in terms of <code>string_view</code>
without compromising constructor deduction functionality.</ins></li>
<li><ins>Improve spec for operator-(const year_month& x, const year_month& y).</ins></li>
<li>Refine constraints on conversions from calendar types to sys_days.</li>
<li>Added <code>zoned_time</code> default constructor.</li>
@@ -91,8 +93,7 @@ Document number: D0355R4<br>
implicit deduction guides.</li>
<li>Create <code>zoned_time(const char* name, ...)</code> overloads to enable
implicit deduction guides. Still to do: Rewrite in terms of <code>string_view</code>
without compromising constructor deduction functionality.</li>
implicit deduction guides.</li>
<li>Give <code>time_of_day</code> default constructor.</li>
@@ -7562,11 +7563,14 @@ constexpr year_month_weekday::operator sys_days() const noexcept;
<blockquote>
<p>
<i>Requires:</i> <code>ok() == true</code>.
<i>Requires:</i> <code>y_.ok() &amp;&amp; m_.ok() &amp;&amp; wdi_.weekday().ok() == true</code>.
</p>
<p>
<i>Returns:</i> A <code>sys_days</code> which represents the date represented by
<code>*this</code>.
<i>Returns:</i> A <code>sys_days</code> which represents the date
<code>(index() - 1)*7</code> days after the first
<code>weekday()</code> of <code>year()/month()</code>. If <code>index()</code> is
<code>0</code> the returned <code>sys_days</code> represents the date 7 days prior
to the first <code>weekday()</code> of <code>year()/month()</code>.
</p>
</blockquote>
@@ -7576,7 +7580,7 @@ constexpr explicit year_month_weekday::operator local_days() const noexcept;
<blockquote>
<p>
<i>Requires:</i> <code>ok() == true</code>.
<i>Requires:</i> <code>y_.ok() &amp;&amp; m_.ok() &amp;&amp; wdi_.weekday().ok() == true</code>.
</p>
<p>
<i>Effects:</i> Equivalent to: <code>return local_days{sys_days{*this}.time_since_epoch()};</code>
@@ -7896,8 +7900,8 @@ constexpr year_month_weekday_last::operator sys_days() const noexcept;
<i>Requires:</i> <code>ok() == true</code>.
</p>
<p>
<i>Returns:</i> A <code>sys_days</code> which represents the date represented by
<code>*this</code>.
<i>Returns:</i> A <code>sys_days</code> which represents the last
<code>weekday()</code> of <code>year()/month()</code>.
</p>
</blockquote>