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BOOST_PROTO_EXTENDS_FUNCTION — For adding to an expression extension class a set of overloaded function call operators that build expression templates.
// In header: <boost/proto/extends.hpp>
BOOST_PROTO_EXTENDS_FUNCTION()
        Use BOOST_PROTO_EXTENDS_FUNCTION() after 
        BOOST_PROTO_BASIC_EXTENDS() to give an expression
        extension class a set of overloaded function call operators that build expression templates.
        In addition, BOOST_PROTO_EXTENDS_FUNCTION() adds a nested
        result<> class template that is a metafunction for
        calculating the return type of the overloaded function call operators.
      
See also: