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## Macro BOOST_PROTO_MAX_ARITY

BOOST_PROTO_MAX_ARITY — Controls the maximum number of child nodes an expression may have.

## Synopsis

    BOOST_PROTO_MAX_ARITY

## Description

`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`.