...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
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 5. 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
.