1 #ifndef BOOST_PREPROCESSOR_LIST_SIZE_HPP
2 #define BOOST_PREPROCESSOR_LIST_SIZE_HPP
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16 #include <boost/preprocessor/list/fold_left.hpp>
17 #include <boost/preprocessor/inc.hpp>
19 /** <p>Expands to the number of elements in the list.</p>
24 BOOST_PP_LIST_SIZE(BOOST_PP_TUPLE_TO_LIST(3,(A,B,C)))
27 <p>expands to <code>3</code>.</p>
31 <li><a href="../../test/list_test.cpp">list_test.cpp</a></li>
34 #define BOOST_PP_LIST_SIZE(LIST) BOOST_PP_LIST_SIZE_D(0,LIST)
36 /** <p>Can be used inside BOOST_PP_WHILE() (see for an explanation of the D parameter).</p> */
37 #define BOOST_PP_LIST_SIZE_D(D,LIST) BOOST_PP_LIST_FOLD_LEFT_D(D,BOOST_PP_LIST_SIZE_F,0,LIST)
38 #define BOOST_PP_LIST_SIZE_F(D,S,X) BOOST_PP_INC(S)