data type for commodities

[Christian Stimming]

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Hi Bill,

As I recently said, I would like to have a new datatype defined for 
representing a commodity and  a value:

struct {
	gnc_commodity* commodity;
	gnc_numeric value;
} commodity-value;

Additionally, we would need a list of this type.

typedef GList<commodity-value[*]> commodity-value-list;

I am not yet sure about the names for the types. Name suggestions: 
commodity_value, currency_value, commodity_numeric, commodity_num, 
comm_num, whatever. We could discuss that on irc, but due to the time 
difference that might be not that easy.

Nor do I know whether they should be handled as pointers or as values. I 
guess you can judge that better.

I can implement most of the functions I need on this type in C. However, I 
don't know where to put that and I don't know how to do the g-wrap stuff. 

Could you please 
1. add that two types in an appropriate place, 
2. together with one or two functions on them,
3. and add the g-wrap stuff?

This would enable me to do everything else by myself. Oh, except that I 
don't know much about GList -- where can I find more docs about that?

Christian

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