feedc0de/boost_mp11
1
0
Fork 0
forked from boostorg/mp11
Code Pull Requests Activity

Change mp_and/mp_or to a SFINAE-based implementation

Browse Source
This commit is contained in:
Peter Dimov
2017-05-23 23:25:30 +03:00
parent dc0faed438
commit 07cac40f3d
5 changed files with 118 additions and 58 deletions
Download Patch File Download Diff File Expand all files Collapse all files
doc/html/mp11.html
+16 -10
View File
@@ -2164,12 +2164,15 @@
</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 the first type <code class="computeroutput"><span class="identifier">U</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 <code class="computeroutput"><span class="identifier">mp_false</span></code>. If no such
type exists, the last one is returned. <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>.
Similar to <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">conjunction</span></code> in C++17.
is <code class="computeroutput"><span class="identifier">mp_false</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>.)
</p>
</div>
<div class="section">
@@ -2189,7 +2192,7 @@
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.
is faster on legacy compilers.
</p>
</div>
<div class="section">
@@ -2200,12 +2203,15 @@
</pre>
<p>
<code class="computeroutput"><span class="identifier">mp_or</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">...&gt;</span></code>
is an alias for the first type <code class="computeroutput"><span class="identifier">U</span></code>
is an alias for <code class="computeroutput"><span class="identifier">mp_true</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 <code class="computeroutput"><span class="identifier">mp_true</span></code>. If no such
type exists, the last one is returned. <code class="computeroutput"><span class="identifier">mp_or</span><span class="special">&lt;&gt;</span></code> is <code class="computeroutput"><span class="identifier">mp_false</span></code>.
Similar to <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">disjunction</span></code> in C++17.
is <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_or</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>.
(<code class="computeroutput"><span class="identifier">mp_or</span><span class="special">&lt;&gt;</span></code>
is <code class="computeroutput"><span class="identifier">mp_false</span></code>.)
</p>
</div>
<div class="section">
@@ -2444,7 +2450,7 @@
</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 17:37:57 GMT</small></p></td>
<td align="left"><p><small>Last revised: May 23, 2017 at 20:23:39 GMT</small></p></td>
<td align="right"><div class="copyright-footer"></div></td>
</tr></table>
<hr>