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Header <boost/proto/context/null.hpp>

Definintion of proto::context::null_context<>, an evaluation context for proto::eval() that simply evaluates each child expression, doesn't combine the results at all, and returns void.

namespace boost {
  namespace proto {
    namespace context {
      template<typename Expr, typename Context> struct null_eval;
      struct null_context;
    }
  }
}

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