Memory layout of a data structure: Difference between revisions
→{{header|J}}: define helpers, show an example
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=={{header|J}}==
J does not support "structures", nor "fields in a structure". Instead, J supports arrays. And, of course, J could have labels corresponding to the elements of an array representing the state (voltage, current, logical bit value, whatever) of each pin of a 9-pin RS-232 plug:
<lang j>default=: 0#~#|:'labels comments'=:|:(4
RD Received data
TD Transmitted data
Line 429 ⟶ 428:
CTS Clear to send
RI Ring indicator
}}
)</lang>▼
indices=: labels (i. ;: ::]) ]
ndx=: [ {~ [ indices ]
asgn=: {{ y (x indices m)} x }}</lang>
Example use:
<lang J> example=: default NB. new instance
example ndx 'RI CTS'
0 0
example=: example 'RI RTS TD' asgn 1 2 3
example ndx 'RI CTS'
=={{header|Julia}}==
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