tuple utilities

From: Christian (chth_at_[hidden])
Date: 2001-10-29 20:26:39

Hi,

has anyone ever written / considered to write some utility stuff for the tuples library?

actually i need:

1) find which tuple-element is derrived from a certain baseclass

        assert( find_derived< tuple< int, std::ofstream > ,std::ostream >::value == 1)
        assert( find_derived< tuple< int, std::ofstream > ,int >::value == 0)
        assert( find_derived< tuple< int, std::ofstream > ,float >::value == -1)

        note: this one is allready finished.

2) constructing a new tuple (tier?) which any element which is derrived from a certain baseclass removed

        assert(
                remove_derived<std::ostream>( make_tuple(42, std::cout, 3.14) ) 
                == make_tuple(42, 3.14)
        )

.. i can also imagine alot of other usefull stull .. removing by index, resorting, appending etc.

So my questions: has anyone allready done such things and want to share it?
        Are there any plans to integrate such into the main boost library?

cya Christian