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[SVN r13169]
This commit is contained in:
Vesa Karvonen
2002-03-10 12:31:37 +00:00
parent 7202e6b56e
commit 03b37c307f
17 changed files with 205 additions and 31 deletions
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30
include/boost/preprocessor/for.hpp
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@ -27,6 +27,21 @@
<p>The length of the sequence is determined by <code>C(R,X)</code>.</p>
<p>For example,</p>
<pre>
#define C(R,X) BOOST_PP_LESS(BOOST_PP_TUPLE_ELEM(2,0,X),BOOST_PP_TUPLE_ELEM(2,1,X))
#define F(R,X) (BOOST_PP_INC(BOOST_PP_TUPLE_ELEM(2,0,X)),BOOST_PP_TUPLE_ELEM(2,1,X))
#define I(R,X) BOOST_PP_TUPLE_ELEM(2,0,X)
BOOST_PP_FOR((0,3),C,F,I)
</pre>
<p>expands to:</p>
<pre>
0 1 2
</pre>
<h3>Legend</h3>
<ul>
<li><b>X</b> is the current state of iteration. The state is usually a tuple.</li>
@ -44,21 +59,6 @@
by the C++ preprocessor.</li>
</ul>
<p>For example,</p>
<pre>
#define C(R,X) BOOST_PP_LESS(BOOST_PP_TUPLE_ELEM(2,0,X),BOOST_PP_TUPLE_ELEM(2,1,X))
#define F(R,X) (BOOST_PP_INC(BOOST_PP_TUPLE_ELEM(2,0,X)),BOOST_PP_TUPLE_ELEM(2,1,X))
#define I(R,X) BOOST_PP_TUPLE_ELEM(2,0,X)
BOOST_PP_FOR((0,3),C,F,I)
</pre>
<p>expands to:</p>
<pre>
0 1 2
</pre>
<h3>BOOST_PP_REPEAT() vs BOOST_PP_FOR()</h3>
<p>BOOST_PP_FOR() is a generalization of BOOST_PP_REPEAT(). This means that