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boost::proto::callable — Base class for callable PolymorphicFunctionObjects
// In header: <boost/proto/proto_fwd.hpp> struct callable { };
            When defining a callable PolymorphicFunctionObject, inherit
            from proto::callable so that it can be used to create
            a CallableTransform.
          
            proto::is_callable<T>::value is
            true for types that inherit from
            proto::callable.