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#if !defined(BOOST_MPL_LIMIT_SET_SIZE) # define BOOST_MPL_LIMIT_SET_SIZE \ implementation-defined integral constant \ /**/ #endif
BOOST_MPL_LIMIT_SET_SIZE is an overridable configuration macro regulating the maximum arity of the set's and set_c's variadic forms. In this implementation of the library, BOOST_MPL_LIMIT_SET_SIZE has a default value of 20. To override the default limit, define BOOST_MPL_LIMIT_SET_SIZE to the desired maximum arity rounded up to the nearest multiple of ten before including any library header. [Note: Overriding will take effect only if the library is configured not to use preprocessed headers. See BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS for more information. — end note]
#define BOOST_MPL_CFG_NO_PREPROCESSED_HEADERS #define BOOST_MPL_LIMIT_SET_SIZE 10 #include <boost/mpl/set.hpp> using namespace boost::mpl; typedef set_c<int,1> s_1; typedef set_c<int,1,2,3,4,5,6,7,8,9,10> s_10; // typedef set_c<int,1,2,3,4,5,6,7,8,9,10,11> s_11; // error!