boostorg/preprocessor
1
0
Fork 1
mirror of https://github.com/boostorg/preprocessor.git synced 2025-07-29 11:47:14 +02:00
Code Issues Packages Projects Releases Wiki Activity

lib cleanup

Browse Source 
[SVN r15693]
This commit is contained in:
Paul Mensonides
2002-10-03 22:13:37 +00:00
parent ae584c68b2
commit 4bb690a819
263 changed files with 14965 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
doc/ref/empty.html Normal file
View File

@ -0,0 +1,36 @@
<html>
<head>
<title>BOOST_PP_EMPTY</title>
<link rel="stylesheet" type="text/css" href="../styles.css">
</head>
<body>
<div style="margin-left: 0px;">
The <b>BOOST_PP_EMPTY</b> macro is a nullary utility macro that expands to nothing.
</div>
<h4>Usage</h4>
<div class="code">
<b>BOOST_PP_EMPTY</b>()
</div>
<h4>Remarks</h4>
<div>
This macro is helps avoid inefficient macro-expansion.&nbsp;
It is primarily useful as arguments to <b>BOOST_PP_IF</b> or <b>BOOST_PP_IIF</b>.
</div>
<h4>Requirements</h4>
<div>
<b>Header:</b> &nbsp;<a href="../headers/facilities/empty.hpp.html">&lt;boost/preprocessor/facilities/empty.hpp&gt;</a>
</div>
<h4>Sample Code</h4>
<div><pre>
#include &lt;<a href="../headers/control/if.hpp.html">boost/preprocessor/control/if.hpp</a>&gt;
#include &lt;<a href="../headers/facilities/empty.hpp.html">boost/preprocessor/facilities/empty.hpp</a>&gt;
#define X() result
#define MACRO(c) <a href="if.html">BOOST_PP_IF</a>(c, X, <a href="empty.html">BOOST_PP_EMPTY</a>)()
MACRO(0) // expands to nothing
MACRO(1) // expands to result
</pre></div>
</body>
</html>