How do I access elements of map of maps and map of maps of sets?

[paddyrg]

Hi all,

Just wondering if there's sample code of a map of maps or map of sets anywhere, and how to address them? Basically let's say we have ...

x := { 0:{"sensors":{1,0,0,0,0,0,0,0}, "outbits":{false, false, false, false}, "outbytes":{0,0,0,0}}, 1:{"sensors":{2,0,0,0,0,0,0,0}, "outbits":{false, false, false, false}, "outbytes":{0,0,0,0}}, 2:{"sensors":{3,0,0,0,0,0,0,0}, "outbits":{false, false, false, false}, "outbytes":{0,0,0,0}}, 3:{"sensors":{0,0,0,0,0,0,0,0}, "outbits":{false, false, false, false}, "outbytes":{0,0,0,0}} }

How would one address the value "x.2.sensors.0" (=3)? Map 2, map "sensors", set first value?

In general, how does one store and address multidimensional data? Anyone got some sample code I can look at?

Thank you kindly!

[kasperl]

The typical approach is using the [] operator if you know the data is there:

x[2]["sensors"][0] = 3

The example is a little bit confusing, because you're using sets like {0,0,0,0} with many equal entries, so in reality such a set will only have one element (0). Also, you cannot really index into a set using the [] operator, maybe the example should use lists defined with [0,0,0,0] instead of sets?

[paddyrg]

Thanks, and I see what you're saying about sets, thank you - I'll rework it as lists :) My original code was all in C++ stuctures so I've got to get away from cyrly braces lol :)