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BOOST_PROTO_MAX_ARITY — Controls the maximum number of child nodes an expression may have.
// In header: <boost/proto/proto_fwd.hpp>
BOOST_PROTO_MAX_ARITY
BOOST_PROTO_MAX_ARITY defaults to 10. It may be set higher or lower, but not
lower than 3. Setting it higher will have a negative effect on compile times.
See also BOOST_PROTO_MAX_FUNCTION_CALL_ARITY.