Records
From Erlang Community
Contents |
[edit] Defining Records
[edit] Without Defaults
Defining a record in code looks like this:
-record( recordname, { element1, element2, element3 } ).
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Defining one in the interpreter looks like this:
rd(recordname, {element1, element2, element3}).
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[edit] With Defaults
Defining a record in code looks like this:
-record( recordname, { element1 = "One", element2 = 2, element3 = three } ).
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Defining one in the interpreter (what I did to create these examples) looks like this:
rd(recordname, {element1 = "One", element2 = 2, element3 = three }).
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[edit] Matching a Record
elementTwoTimesEight( #recordname{ element2 = T } ) -> T * 8.
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[edit] Getting the value of a record element
1> R1 = #recordname{}. % Uses the defaults.
#recordname{element1 = "One",element2 = 2,element3 = three}
2> io:format("~p~n", [R1#recordname.element1]). % prints "One"
"One"
ok
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[edit] Modifying a Record
3> R2 = #recordname{}. % Uses the defaults.
#recordname{element1 = "One",element2 = 2,element3 = three}
4> R3 = R2#recordname{ element1 = "Two" }. % Only modify one part of the record.
#recordname{element1 = "Two",element2 = 2,element3 = three}
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[edit] More Information
More information at http://erlang.org/doc/getting_started/records_macros.html#5.3.
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