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Automatic recursion

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[SVN r14100]
This commit is contained in:
Vesa Karvonen
2002-06-07 13:04:18 +00:00
parent a18d5f79fc
commit 9f9048e805
82 changed files with 971 additions and 869 deletions
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10
include/boost/preprocessor/for.hpp
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@ -75,6 +75,14 @@ still quite useful on its own.</p>
<p>BOOST_PP_FOR() can be used for multidimensional repetition simply by
invoking BOOST_PP_FOR##R() directly.</p>
<h3>Automatic recursion?</h3>
<p>BOOST_PP_FOR() currently does not implement automatic recursion. The reason
for this is that it would lead to very poor performance. The automatic recursion
technique takes O(N) steps just to find out that the Nth recursion should be used.
This would dramatically effect the time complexity of macros using automatic
recursion.</p>
<h3>Test</h3>
<ul>
<li><a href="../../test/for_test.cpp">for_test.cpp</a></li>
@ -213,5 +221,5 @@ invoking BOOST_PP_FOR##R() directly.</p>
#define BOOST_PP_FOR126(S,P,O,M) BOOST_PP_FOR_C0(P,127,S,M)(127,S) BOOST_PP_FOR_C1(P,127,S)(O(127,S),P,O,M)
#define BOOST_PP_FOR127(S,P,O,M) BOOST_PP_FOR_C0(P,128,S,M)(128,S) BOOST_PP_FOR_C1(P,128,S)(O(128,S),P,O,M)
#define BOOST_PP_FOR128(S,P,O,M) BOOST_PP_FOR_C0(P,129,S,M)(129,S) BOOST_PP_FOR_C1(P,129,S)(O(129,S),P,O,M)
#define BOOST_PP_FOR129(S,P,O,M) RECURSION DEPTH EXCEEDED!
#define BOOST_PP_FOR129(S,P,O,M) (RECURSION DEPTH EXCEEDED!)
#endif