Boost
  C++ Libraries
  
  ...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_REPEAT — Repeatedly invoke the specified macro.
// In header: <boost/proto/repeat.hpp>
BOOST_PROTO_REPEAT(MACRO)
        BOOST_PROTO_REPEAT() is used to generate the kind of repetitive
        code that is typical of EDSLs built with Proto.
        BOOST_PROTO_REPEAT(
        is equivalent to:
      MACRO)
MACRO(1, BOOST_PROTO_typename_A, BOOST_PROTO_A_const_ref, BOOST_PROTO_A_const_ref_a, BOOST_PROTO_ref_a)MACRO(2, BOOST_PROTO_typename_A, BOOST_PROTO_A_const_ref, BOOST_PROTO_A_const_ref_a, BOOST_PROTO_ref_a) ...MACRO(BOOST_PROTO_MAX_ARITY, BOOST_PROTO_typename_A, BOOST_PROTO_A_const_ref, BOOST_PROTO_A_const_ref_a, BOOST_PROTO_ref_a)
Example:
        See BOOST_PROTO_REPEAT_FROM_TO().