Updated docs __VA_OPT__ support.

This commit is contained in:
Edward Diener
2019-10-30 14:32:45 -04:00
parent 4fe7807f79
commit a9827c8fc8
2 changed files with 4 additions and 3 deletions

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@ -15,6 +15,7 @@
<ul> <ul>
<li><a href="facilities/apply.html">&lt;boost/preprocessor/facilities/apply.hpp&gt;</a></li> <li><a href="facilities/apply.html">&lt;boost/preprocessor/facilities/apply.hpp&gt;</a></li>
<li><a href="facilities/empty.html">&lt;boost/preprocessor/facilities/empty.hpp&gt;</a></li> <li><a href="facilities/empty.html">&lt;boost/preprocessor/facilities/empty.hpp&gt;</a></li>
<li><a href="facilities/check_empty.html">&lt;boost/preprocessor/facilities/check_empty.hpp&gt;</a></li>
<li><a href="facilities/expand.html">&lt;boost/preprocessor/facilities/expand.hpp&gt;</a></li> <li><a href="facilities/expand.html">&lt;boost/preprocessor/facilities/expand.hpp&gt;</a></li>
<li><a href="facilities/identity.html">&lt;boost/preprocessor/facilities/identity.hpp&gt;</a></li> <li><a href="facilities/identity.html">&lt;boost/preprocessor/facilities/identity.hpp&gt;</a></li>
<li><a href="facilities/intercept.html">&lt;boost/preprocessor/facilities/intercept.hpp&gt;</a></li> <li><a href="facilities/intercept.html">&lt;boost/preprocessor/facilities/intercept.hpp&gt;</a></li>

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<h4>Expanding to nothing</h4> <h4>Expanding to nothing</h4>
<div> <div>
Given certain arguments a macro might expand to nothing, aka no preprocessor tokens. This may Given certain arguments a macro might expand to nothing, aka no preprocessor tokens. This may
happen more than the previous case of an argument to a macro being nothing because the expansion of a macro happen more than in the previous case of an argument to a macro being nothing because the expansion of a macro
is often used to initialize some C++ construct, and C++ has some places where is often used to initialize some C++ construct, and C++ has some places where
a part of a compile-time construct can be empty. However a macro which expands to nothing a part of a compile-time construct can be empty. However a macro which expands to nothing
rarely occurs when a macro's expansion is used as an argument to another macro, although rarely occurs when that macro's expansion is used as an argument to another macro because we would again have
again it is perfectly legal C++. a macro where we are passing nothing as an argument.
</div> </div>
<div class="code"> <div class="code">
<pre> <pre>