Le mercredi 27 février 2008, Martijn van Oosterhout a écrit : > I see no-one responded to this: a varlena has no fixed header size, so > you can't fit it in a structure anyway. Once you're passed a pointer > you use the LEN/PTR macros to extract what you want.
Once the type exists and the code gets some varlena kind type of objects to play with, I think I'll use the same macros as for text usage... My problem is more how to define a new "composite varlena", that is a new varlena type composed of several base type... I'm not sure I'm using a good vocabulary, please forgive me if it's all unclear... > Not sure what the chars are for Maybe the input syntax would help getting what the chars are for. To say a prefix range begins with '012' and any entry between '3' and '6', you'd write e.g. '012[3-6]'::prefix_range. The chars are respectively '3' and '6' and the greatest prefix of the prefix range is '012' here. Here, '012[3-6]' @> '01234' is true but '012[3-6]' @> '0122' is false. > , but perhaps it would be easiest to > treat it as a single text object with the two leading characters > signifying something? I like your idea of using a single text datum for this and "encode" into it the information I need: it makes it all simple for me to start working. But still does not answer the question... not that the answer is needed any more... Thanks, -- dim
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