boost.parameter and constructors

In the documentation: http://www.boost.org/doc/libs/1_45_0/libs/parameter/doc/html/index.html#parameter-enabled-constructors

Do I understand correctly, that I can't use parameter names without using base-class, as shown in the example?

Because macro BOOST_P开发者_JAVA百科ARAMETER_CONSTRUCTOR, as the second argument requires the name of base-class to be specified.

Thanks.

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Yes, that would be correct. 123