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Edward Diener
2015-10-14 22:36:27 -04:00
parent e983c16e61 88c4282493
commit 4e29a160b9
7 changed files with 78 additions and 3 deletions
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4
doc/headers/facilities/identity.html
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@ -5,7 +5,7 @@
</head>
<body>
<div style="margin-left: 0px;">
The <b>facilities/identity.hpp</b> header defines a utility macro to use with <b>BOOST_PP_IF</b> and <b>BOOST_PP_IIF</b>.
The <b>facilities/identity.hpp</b> header defines utility macros to use with <b>BOOST_PP_IF</b> and <b>BOOST_PP_IIF</b>.
</div>
<h4>Usage</h4>
<div class="code">
@ -14,11 +14,13 @@
<h4>Contents</h4>
<ul>
<li><a href="../../ref/identity.html">BOOST_PP_IDENTITY</a></li>
<li><a href="../../ref/identity_n.html">BOOST_PP_IDENTITY_N</a></li>
</ul>
<hr size="1">
<div style="margin-left: 0px;">
<i><EFBFBD> Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
</br><i><EFBFBD> Copyright Paul Mensonides 2002</i>
</br><i><EFBFBD> Copyright Edward Diener 2015</i>
</div>
<div style="margin-left: 0px;">
<p><small>Distributed under the Boost Software License, Version 1.0. (See

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doc/headers/tuple/enum.html
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@ -2,7 +2,7 @@
<title>tuple/enum.hpp</title>
<link rel="stylesheet" type="text/css" href="../../styles.css"></head><body>
<div style="margin-left: 0px;">
The <b>tuple/enum.hpp</b> header defines a macro to onvert a <i>tuple</i> to its comma-separated elements.
The <b>tuple/enum.hpp</b> header defines a macro to convert a <i>tuple</i> to its comma-separated elements.
</div>
<h4>Usage</h4>
<div class="code">

1
doc/ref.html
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@ -99,6 +99,7 @@
<li><a href="ref/greater_equal_d.html">GREATER_EQUAL_D</a></li>
<!-- I -->
<li><a href="ref/identity.html">IDENTITY</a></li>
<li><a href="ref/identity_n.html">IDENTITY_N</a></li>
<li><a href="ref/if.html">IF</a></li>
<li><a href="ref/iif.html">IIF</a></li>
<li><a href="ref/inc.html">INC</a></li>

58
doc/ref/identity_n.html Normal file
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@ -0,0 +1,58 @@
<html>
<head>
<title>BOOST_PP_IDENTITY_N</title>
<link rel="stylesheet" type="text/css" href="../styles.css">
</head>
<body>
<div style="margin-left: 0px;">
The <b>BOOST_PP_IDENTITY_N</b> macro expands to its first argument when invoked.
</div>
<h4>Usage</h4>
<div class="code">
<b>BOOST_PP_IDENTITY_N</b>(<i>item,n</i>)(n-arguments)
</div>
<h4>Arguments</h4>
<dl>
<dt>item</dt>
<dd>
The result of the expansion.
</dd>
<dt>n</dt>
<dd>
The number of arguments when invoked.
</dd>
</dl>
<h4>Remarks</h4>
<div>
This macro is designed to be used with <b>BOOST_PP_IF</b> and <b>BOOST_PP_IIF</b> when only one of the clauses needs to be invoked.
</div>
<h4>See Also</h4>
<ul>
<li><a href="if.html">BOOST_PP_IF</a></li>
<li><a href="iif.html">BOOST_PP_IIF</a></li>
</ul>
<h4>Requirements</h4>
<div>
<b>Header:</b> &nbsp;<a href="../headers/facilities/identity_n.html">&lt;boost/preprocessor/facilities/identity.hpp&gt;</a>
</div>
<h4>Sample Code</h4>
<div><pre>
#include &lt;<a href="../headers/control/if.html">boost/preprocessor/control/if.hpp</a>&gt;
#include &lt;<a href="../headers/facilities/identity.html">boost/preprocessor/facilities/identity.hpp</a>&gt;
#define MACRO_CAT(y,z) y ## z
#define MACRO(n) <a href="if.html">BOOST_PP_IF</a>(n, <a href="identity_n.html">BOOST_PP_IDENTITY_N</a>(x,2), MACRO_CAT)(a,b)
MACRO(0) // expands to ab
MACRO(1) // expands to x
</pre></div>
<hr size="1">
<div style="margin-left: 0px"><i>&copy; Copyright Edward Diener 2015</i></div>
<div style="margin-left: 0px;">
<p><small>Distributed under the Boost Software License, Version 1.0. (See
accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
copy at <a href=
"http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
</div>
</body>
</html>

4
include/boost/preprocessor/facilities/identity.hpp
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@ -8,6 +8,7 @@
# */
#
# /* Revised by Paul Mensonides (2002) */
# /* Revised by Edward Diener (2015) */
#
# /* See http://www.boost.org for most recent version. */
#
@ -15,9 +16,12 @@
# define BOOST_PREPROCESSOR_FACILITIES_IDENTITY_HPP
#
# include <boost/preprocessor/facilities/empty.hpp>
# include <boost/preprocessor/tuple/eat.hpp>
#
# /* BOOST_PP_IDENTITY */
#
# define BOOST_PP_IDENTITY(item) item BOOST_PP_EMPTY
#
# define BOOST_PP_IDENTITY_N(item,n) item BOOST_PP_TUPLE_EAT_N(n)
#
# endif

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include/boost/preprocessor/tuple/eat.hpp
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@ -8,7 +8,7 @@
# */
#
# /* Revised by Paul Mensonides (2002-2011) */
# /* Revised by Edward Diener (2011) */
# /* Revised by Edward Diener (2011,2015) */
#
# /* See http://www.boost.org for most recent version. */
#
@ -38,6 +38,15 @@
# endif
# define BOOST_PP_TUPLE_EAT_I(size) BOOST_PP_TUPLE_EAT_ ## size
# endif
#
# if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MWCC()
# define BOOST_PP_TUPLE_EAT_N(size) BOOST_PP_TUPLE_EAT_N_I(size)
# else
# define BOOST_PP_TUPLE_EAT_N(size) BOOST_PP_TUPLE_EAT_N_OO((size))
# define BOOST_PP_TUPLE_EAT_N_OO(par) BOOST_PP_TUPLE_EAT_N_I ## par
# endif
# define BOOST_PP_TUPLE_EAT_N_I(size) BOOST_PP_TUPLE_EAT_ ## size
#
# define BOOST_PP_TUPLE_EAT_1(e0)
# define BOOST_PP_TUPLE_EAT_2(e0, e1)
# define BOOST_PP_TUPLE_EAT_3(e0, e1, e2)

1
test/facilities.cxx
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@ -26,6 +26,7 @@ BEGIN BOOST_PP_APPLY((BOOST_PP_EMPTY))() 0 == 0 END
BEGIN BOOST_PP_EXPAND(MACRO ARGS) == 1 END
BEGIN BOOST_PP_IDENTITY(1)() == 1 END
BEGIN BOOST_PP_IDENTITY_N(36,10)(0,1,2,3,4,5,6,7,8,9) == 36 END
BEGIN BOOST_PP_CAT(BOOST_PP_INTERCEPT, 2) 1 == 1 END