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D - Templates and Associative Arrays

Is it possible to create a template function that treats regular dynamic
arrays the same as associative arrays?  For example, I want to create a very
simple template function to extract a column from a 2-d array of T's.  If the
array is non-associative in both dimensions, the function could be trivially
implemented as:

T[] extract_column(T)(T[][] data, size_t column_to_extract)
    T[] extracted_column;
    foreach(row; data)
    return extracted_column;

However, in the case of an associatve array, I cannot think of any obvious way
to make this work without essentially implementing it four different times,
once each for an associative and non-associative row dimension and likewise
for the column dimension.
Jan 20 2008