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Added function value_or()

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Andrzej Krzemienski
2014-05-23 16:38:42 +02:00
parent 75271b73a8
commit 3984c9f9a1
7 changed files with 100 additions and 18 deletions
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doc/html/boost_optional/detailed_semantics.html
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@@ -1235,6 +1235,30 @@
<span class="identifier">asert</span> <span class="special">(</span> <span class="keyword">true</span> <span class="special">);</span>
<span class="special">}</span>
</pre>
<span class="inlinemediaobject"><img src="../images/space.png" alt="space"></span>
</li>
</ul></div>
<a name="reference_optional_value_or"></a><div class="blockquote"><blockquote class="blockquote"><p>
<code class="computeroutput"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">U</span><span class="special">&gt;</span> <span class="identifier">T</span> <span class="identifier">optional</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">value_or</span><span class="special">(</span><span class="identifier">U</span> <span class="special">&amp;&amp;</span>
<span class="identifier">v</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">;</span></code>
</p></blockquote></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<span class="bold"><strong>Requires:</strong></span> <code class="computeroutput"><span class="identifier">T</span></code>
is CopyConstructible.
</li>
<li class="listitem">
<span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="keyword">bool</span><span class="special">(*</span><span class="keyword">this</span><span class="special">)</span>
<span class="special">?</span> <span class="special">**</span><span class="keyword">this</span> <span class="special">:</span> <span class="keyword">static_cast</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;(</span><span class="identifier">forward</span><span class="special">&lt;</span><span class="identifier">U</span><span class="special">&gt;(</span><span class="identifier">v</span><span class="special">))</span></code>.
</li>
<li class="listitem">
<span class="bold"><strong>Throws:</strong></span> Any exception thrown by the selected
constructor of <code class="computeroutput"><span class="identifier">T</span></code>.
</li>
<li class="listitem">
<span class="bold"><strong>Notes:</strong></span> On compilers without rvalue reference
support the type of <code class="computeroutput"><span class="identifier">v</span></code> becomes
<code class="computeroutput"><span class="identifier">U</span> <span class="keyword">const</span><span class="special">&amp;</span></code>.
</li>
</ul></div>
<p>
@@ -1264,6 +1288,9 @@
<span class="identifier">o</span><span class="special">,</span> <span class="identifier">T</span><span class="special">&amp;</span> <span class="keyword">default</span> <span class="special">)</span> <span class="special">;</span></code>
</p></blockquote></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<span class="bold"><strong>Deprecated:</strong></span> Use <code class="computeroutput"><span class="identifier">value_or</span><span class="special">()</span></code> instead.
</li>
<li class="listitem">
<span class="bold"><strong>Returns:</strong></span> A reference to the contained
value, if any, or <code class="computeroutput"><span class="keyword">default</span></code>.