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Peter Dimov
2017-05-24 05:58:06 +03:00
parent fc562c7421
commit 8e1da77904
2 changed files with 15 additions and 15 deletions
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@@ -2176,15 +2176,14 @@
</pre>
<p>
<code class="computeroutput"><span class="identifier">mp_and</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">...&gt;</span></code>
is an alias for <code class="computeroutput"><span class="identifier">mp_false</span></code>
if there exists a type <code class="computeroutput"><span class="identifier">U</span></code>
in <code class="computeroutput"><span class="identifier">T</span><span class="special">...</span></code>
for which <code class="computeroutput"><span class="identifier">mp_to_bool</span><span class="special">&lt;</span><span class="identifier">U</span><span class="special">&gt;</span></code>
is not <code class="computeroutput"><span class="identifier">mp_true</span></code>. <code class="computeroutput"><span class="identifier">mp_to_bool</span><span class="special">&lt;</span><span class="identifier">U</span><span class="special">&gt;</span></code>
is not evaluated for types after <code class="computeroutput"><span class="identifier">U</span></code>.
If no such type exists, <code class="computeroutput"><span class="identifier">mp_and</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">...&gt;</span></code> is an alias for <code class="computeroutput"><span class="identifier">mp_true</span></code>.
(<code class="computeroutput"><span class="identifier">mp_and</span><span class="special">&lt;&gt;</span></code>
is <code class="computeroutput"><span class="identifier">mp_true</span></code>.)
applies <code class="computeroutput"><span class="identifier">mp_to_bool</span></code> to the
types in <code class="computeroutput"><span class="identifier">T</span><span class="special">...</span></code>,
in order. If the result of an application is <code class="computeroutput"><span class="identifier">mp_false</span></code>,
<code class="computeroutput"><span class="identifier">mp_and</span></code> returns <code class="computeroutput"><span class="identifier">mp_false</span></code>. If the application causes a
substitution failure, returns <code class="computeroutput"><span class="identifier">mp_false</span></code>.
If all results are <code class="computeroutput"><span class="identifier">mp_true</span></code>,
returns <code class="computeroutput"><span class="identifier">mp_true</span></code>. <code class="computeroutput"><span class="identifier">mp_and</span><span class="special">&lt;&gt;</span></code>
is <code class="computeroutput"><span class="identifier">mp_true</span></code>.
</p>
<pre class="programlisting"><span class="keyword">using</span> <span class="identifier">R1</span> <span class="special">=</span> <span class="identifier">mp_and</span><span class="special">&lt;</span><span class="identifier">mp_true</span><span class="special">,</span> <span class="identifier">mp_true</span><span class="special">&gt;;</span> <span class="comment">// mp_true</span>
<span class="keyword">using</span> <span class="identifier">R2</span> <span class="special">=</span> <span class="identifier">mp_and</span><span class="special">&lt;</span><span class="identifier">mp_false</span><span class="special">,</span> <span class="keyword">void</span><span class="special">&gt;;</span> <span class="comment">// mp_false, void is not reached</span>
@@ -2209,7 +2208,7 @@
is an error because <code class="computeroutput"><span class="keyword">void</span></code> does
not have a nested <code class="computeroutput"><span class="identifier">value</span></code>.
The upside is that <code class="computeroutput"><span class="identifier">mp_all</span></code>
is faster on legacy compilers.
is potentially faster and does not mask substitution failures as <code class="computeroutput"><span class="identifier">mp_and</span></code> does.
</p>
<pre class="programlisting"><span class="keyword">using</span> <span class="identifier">R1</span> <span class="special">=</span> <span class="identifier">mp_and</span><span class="special">&lt;</span><span class="identifier">mp_true</span><span class="special">,</span> <span class="identifier">mp_true</span><span class="special">&gt;;</span> <span class="comment">// mp_true</span>
<span class="keyword">using</span> <span class="identifier">R2</span> <span class="special">=</span> <span class="identifier">mp_and</span><span class="special">&lt;</span><span class="identifier">mp_false</span><span class="special">,</span> <span class="keyword">void</span><span class="special">&gt;;</span> <span class="comment">// compile-time error</span>
@@ -2493,7 +2492,7 @@
</div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"><p><small>Last revised: May 23, 2017 at 22:51:13 GMT</small></p></td>
<td align="left"><p><small>Last revised: May 24, 2017 at 02:43:53 GMT</small></p></td>
<td align="right"><div class="copyright-footer"></div></td>
</tr></table>
<hr>