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[SVN r29158]
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Fernando Cacciola
2005-05-23 14:04:03 +00:00
parent dda39772ad
commit 88d002a7be
1 changed files with 3 additions and 3 deletions
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doc/optional.html
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@ -1049,7 +1049,7 @@ assert ( optX != optZ ) ;
<pre>bool operator &gt; ( optional&lt;T&gt; const&amp x, optional&lt;T&gt const&amp y );
</pre>
<blockquote>
<p><b>Returns:</b> !( y &lt; x );</p>
<p><b>Returns:</b> ( y &lt; x );</p>
<p><b>Throws:</b> Nothing.</p>
</blockquote>
@ -1428,10 +1428,10 @@ public:
<H2><A NAME="bool">A note about optional&lt;bool&gt;</A></H2>
<p><code>optional&lt;bool&gt;</code> should be used with special caution and consideration.</p>
<p>First, it is functionally similar to a tristate boolean (false,maybe,true) &mdash;such as <u>boost::tribool</u> (not yet formally in boost)&mdash;except that in a tristate boolean,
<p>First, it is functionally similar to a tristate boolean (false,maybe,true) &mdash;such as <a href="http://www.boost.org/doc/html/tribool.html">boost::tribool</a>&mdash;except that in a tristate boolean,
the <i>maybe</i> state <u>represents a valid value</u>, unlike the corresponding state
of an uninitialized optional&lt;bool&gt;.<br>
It should be carefully considered if an optional bool instead of a tribool is really needed</p>
It should be carefully considered if an optional&lt;bool&gt; instead of a tribool is really needed</p>
<p>Second, optional&lt;&gt; provides an implicit conversion to bool. This conversion
refers to the initialization state and not to the contained value.<br>
Using optional&lt;bool&gt; can lead to subtle errors due to the implicit bool conversion:</p>