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The (in)equality comparison with boost::none does not require that T be EqualityComparable
This commit is contained in:
Andrzej Krzemienski
@ -1497,6 +1497,10 @@
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<span class="identifier">y</span> <span class="special">);</span></code>
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</p></blockquote></div>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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<span class="bold"><strong>Requires:</strong></span> <code class="computeroutput"><span class="identifier">T</span></code>
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shall meet requirements of <code class="computeroutput"><span class="identifier">EqualityComparable</span></code>.
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</li>
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<li class="listitem">
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<span class="bold"><strong>Returns:</strong></span> If both <code class="computeroutput"><span class="identifier">x</span></code>
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and <code class="computeroutput"><span class="identifier">y</span></code> are initialized,
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@ -1553,6 +1557,10 @@
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<span class="identifier">y</span> <span class="special">);</span></code>
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</p></blockquote></div>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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<span class="bold"><strong>Requires:</strong></span> <code class="computeroutput"><span class="identifier">T</span></code>
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shall meet requirements of <code class="computeroutput"><span class="identifier">LessThanComparable</span></code>.
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</li>
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<li class="listitem">
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<span class="bold"><strong>Returns:</strong></span> If <code class="computeroutput"><span class="identifier">y</span></code>
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is not initialized, <code class="computeroutput"><span class="keyword">false</span></code>.
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@ -1648,7 +1656,8 @@
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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<span class="bold"><strong>Returns: </strong></span> <code class="computeroutput"><span class="special">!(</span>
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<span class="identifier">y</span><span class="special"><</span><span class="identifier">x</span> <span class="special">);</span></code>
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<span class="identifier">y</span> <span class="special"><</span>
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<span class="identifier">x</span> <span class="special">);</span></code>
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</li>
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<li class="listitem">
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<span class="bold"><strong>Throws:</strong></span> Nothing.
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@ -1673,6 +1682,33 @@
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<span class="bold"><strong>Throws:</strong></span> Nothing.
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</li>
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</ul></div>
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<a name="reference_operator_compare_equal_optional_none"></a><div class="blockquote"><blockquote class="blockquote"><p>
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<code class="computeroutput"><span class="keyword">bool</span> <span class="keyword">operator</span>
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<span class="special">==</span> <span class="special">(</span> <span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">x</span><span class="special">,</span> <span class="identifier">none_t</span>
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<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></code>
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</p></blockquote></div>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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<span class="bold"><strong>Returns:</strong></span> <code class="computeroutput"><span class="special">!</span><span class="identifier">x</span></code>.
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</li>
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<li class="listitem">
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<span class="bold"><strong>Notes:</strong></span> <code class="computeroutput"><span class="identifier">T</span></code>
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need not meet requirements of <code class="computeroutput"><span class="identifier">EqualityComparable</span></code>.
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</li>
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</ul></div>
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<p>
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<span class="inlinemediaobject"><img src="../images/space.png" alt="space"></span>
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</p>
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<a name="reference_operator_compare_not_equal_optional_none"></a><div class="blockquote"><blockquote class="blockquote"><p>
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<code class="computeroutput"><span class="keyword">bool</span> <span class="keyword">operator</span>
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<span class="special">!=</span> <span class="special">(</span> <span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">x</span><span class="special">,</span> <span class="identifier">none_t</span>
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<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></code>
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</p></blockquote></div>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
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<span class="bold"><strong>Returns: </strong></span> <code class="computeroutput"><span class="special">!(</span>
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<span class="identifier">x</span> <span class="special">==</span>
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<span class="identifier">y</span> <span class="special">);</span></code>
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</li></ul></div>
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<p>
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<span class="inlinemediaobject"><img src="../images/space.png" alt="space"></span>
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</p>
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@ -122,6 +122,10 @@
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<span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">></span> <span class="keyword">inline</span> <span class="keyword">bool</span> <span class="keyword">operator</span> <span class="special">>=</span> <span class="special">(</span> <span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">x</span><span class="special">,</span> <span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">y</span> <span class="special">)</span> <span class="special">;</span> <a class="link" href="detailed_semantics.html#reference_operator_compare_greater_or_equal_optional_optional"><span class="inlinemediaobject"><img src="../images/callouts/R.png" alt="R"></span></a>
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<span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">></span> <span class="keyword">inline</span> <span class="keyword">bool</span> <span class="keyword">operator</span> <span class="special">==</span> <span class="special">(</span> <span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">x</span><span class="special">,</span> <span class="identifier">none_t</span> <span class="special">)</span> <span class="keyword">noexcept</span> <span class="special">;</span> <a class="link" href="detailed_semantics.html#reference_operator_compare_equal_optional_none"><span class="inlinemediaobject"><img src="../images/callouts/R.png" alt="R"></span></a>
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<span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">></span> <span class="keyword">inline</span> <span class="keyword">bool</span> <span class="keyword">operator</span> <span class="special">!=</span> <span class="special">(</span> <span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">x</span><span class="special">,</span> <span class="identifier">none_t</span> <span class="special">)</span> <span class="keyword">noexcept</span> <span class="special">;</span> <a class="link" href="detailed_semantics.html#reference_operator_compare_not_equal_optional_none"><span class="inlinemediaobject"><img src="../images/callouts/R.png" alt="R"></span></a>
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<span class="comment">// [new in 1.34]</span>
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<span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">></span> <span class="keyword">inline</span> <span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="identifier">make_optional</span> <span class="special">(</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">v</span> <span class="special">)</span> <span class="special">;</span> <a class="link" href="detailed_semantics.html#reference_make_optional_value"><span class="inlinemediaobject"><img src="../images/callouts/R.png" alt="R"></span></a>
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@ -27,9 +27,9 @@
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<a name="boost_optional.type_requirements"></a><a class="link" href="type_requirements.html" title="Type requirements">Type requirements</a>
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</h2></div></div></div>
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<p>
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In general, <code class="computeroutput"><span class="identifier">T</span></code> must be <a href="../../../../utility/CopyConstructible.html" target="_top">Copy Constructible</a> and
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have a no-throw destructor. The copy-constructible requirement is not needed
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if <span class="bold"><strong>InPlaceFactories</strong></span> are used.
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In general, <code class="computeroutput"><span class="identifier">T</span></code> must be <code class="computeroutput"><span class="identifier">MoveConstructible</span></code> and have a no-throw destructor.
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The <code class="computeroutput"><span class="identifier">MoveConstructible</span></code> requirement
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is not needed if <span class="bold"><strong>InPlaceFactories</strong></span> are used.
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</p>
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<p>
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<code class="computeroutput"><span class="identifier">T</span></code> <span class="underline">is
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