Mixing
Define an access by key ( structure[key] ) for a custom structure struct?
5
$begingroup$
I have some "complicated" data that I want to encapsulate into a "struct":
For instance (imagine that data have several fields):
data=<|"A"->6,"B"->2|>
var=myType[data]
The advantage is that it is easy to filter your arguments:
doSomething[myType[d_]]:=d
(* usage: *)
doSomething[var]
Now I want to allow this:
var["B"] <- must return 2
But I do not know how to do that, any idea?
What I have done so far:
myType /: Key[k_][myType[d_]:=d[k]
This works for syntax like:
Key["B"][var]
but not for
var["B"]
associations
asked Feb 1 at 11:49
Picaud VincentPicaud Vincent
1,247518
$endgroup$
add a comment |
5
$begingroup$
I have some "complicated" data that I want to encapsulate into a "struct":
For instance (imagine that data have several fields):
data=<|"A"->6,"B"->2|>
var=myType[data]
The advantage is that it is easy to filter your arguments:
doSomething[myType[d_]]:=d
(* usage: *)
doSomething[var]
Now I want to allow this:
var["B"] <- must return 2
But I do not know how to do that, any idea?
What I have done so far:
myType /: Key[k_][myType[d_]:=d[k]
This works for syntax like:
Key["B"][var]
but not for
var["B"]
associations
asked Feb 1 at 11:49
Picaud VincentPicaud Vincent
1,247518
$endgroup$
add a comment |
5
5
5
$begingroup$
I have some "complicated" data that I want to encapsulate into a "struct":
For instance (imagine that data have several fields):
data=<|"A"->6,"B"->2|>
var=myType[data]
The advantage is that it is easy to filter your arguments:
doSomething[myType[d_]]:=d
(* usage: *)
doSomething[var]
Now I want to allow this:
var["B"] <- must return 2
But I do not know how to do that, any idea?
What I have done so far:
myType /: Key[k_][myType[d_]:=d[k]
This works for syntax like:
Key["B"][var]
but not for
var["B"]
associations
asked Feb 1 at 11:49
Picaud VincentPicaud Vincent
1,247518
$endgroup$
I have some "complicated" data that I want to encapsulate into a "struct":
For instance (imagine that data have several fields):
data=<|"A"->6,"B"->2|>
var=myType[data]
The advantage is that it is easy to filter your arguments:
doSomething[myType[d_]]:=d
(* usage: *)
doSomething[var]
Now I want to allow this:
var["B"] <- must return 2
But I do not know how to do that, any idea?
What I have done so far:
myType /: Key[k_][myType[d_]:=d[k]
This works for syntax like:
Key["B"][var]
but not for
var["B"]
associations
associations
asked Feb 1 at 11:49
Picaud VincentPicaud Vincent
1,247518
asked Feb 1 at 11:49
Picaud VincentPicaud Vincent
1,247518
edited Feb 1 at 14:19
Picaud Vincent
asked Feb 1 at 11:49
Picaud VincentPicaud Vincent
1,247518
asked Feb 1 at 11:49
Picaud VincentPicaud Vincent
1,247518
asked Feb 1 at 11:49
Picaud VincentPicaud Vincent
1,247518
1,247518
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
5
$begingroup$
ClearAll[myType]
myType /: myType[data_Association][s_String] := data[[s]]
var = myType[<|"A" -> 6, "B" -> 2|>];
var["B"]
2
answered Feb 1 at 12:01
Henrik SchumacherHenrik Schumacher
59.8k582166
$endgroup$
$begingroup$
Thanks again Henrik, my questions are too easy :-)
$endgroup$
– Picaud Vincent
Feb 1 at 12:09
$begingroup$
You're welcome.
$endgroup$
– Henrik Schumacher
Feb 1 at 12:12
3
$begingroup$
This definitely works, though it's good to notice that this sets aSubValueformyType, not anUpValue.
$endgroup$
– Sjoerd Smit
Feb 1 at 13:35
add a comment |
Your Answer
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
5
$begingroup$
ClearAll[myType]
myType /: myType[data_Association][s_String] := data[[s]]
var = myType[<|"A" -> 6, "B" -> 2|>];
var["B"]
2
answered Feb 1 at 12:01
Henrik SchumacherHenrik Schumacher
59.8k582166
$endgroup$
$begingroup$
Thanks again Henrik, my questions are too easy :-)
$endgroup$
– Picaud Vincent
Feb 1 at 12:09
$begingroup$
You're welcome.
$endgroup$
– Henrik Schumacher
Feb 1 at 12:12
3
$begingroup$
This definitely works, though it's good to notice that this sets aSubValueformyType, not anUpValue.
$endgroup$
– Sjoerd Smit
Feb 1 at 13:35
add a comment |
5
$begingroup$
ClearAll[myType]
myType /: myType[data_Association][s_String] := data[[s]]
var = myType[<|"A" -> 6, "B" -> 2|>];
var["B"]
2
answered Feb 1 at 12:01
Henrik SchumacherHenrik Schumacher
59.8k582166
$endgroup$
$begingroup$
Thanks again Henrik, my questions are too easy :-)
$endgroup$
– Picaud Vincent
Feb 1 at 12:09
$begingroup$
You're welcome.
$endgroup$
– Henrik Schumacher
Feb 1 at 12:12
3
$begingroup$
This definitely works, though it's good to notice that this sets aSubValueformyType, not anUpValue.
$endgroup$
– Sjoerd Smit
Feb 1 at 13:35
add a comment |
5
5
5
$begingroup$
ClearAll[myType]
myType /: myType[data_Association][s_String] := data[[s]]
var = myType[<|"A" -> 6, "B" -> 2|>];
var["B"]
2
answered Feb 1 at 12:01
Henrik SchumacherHenrik Schumacher
59.8k582166
$endgroup$
ClearAll[myType]
myType /: myType[data_Association][s_String] := data[[s]]
var = myType[<|"A" -> 6, "B" -> 2|>];
var["B"]
2
answered Feb 1 at 12:01
Henrik SchumacherHenrik Schumacher
59.8k582166
answered Feb 1 at 12:01
Henrik SchumacherHenrik Schumacher
59.8k582166
answered Feb 1 at 12:01
Henrik SchumacherHenrik Schumacher
59.8k582166
answered Feb 1 at 12:01
Henrik SchumacherHenrik Schumacher
59.8k582166
59.8k582166
$begingroup$
Thanks again Henrik, my questions are too easy :-)
$endgroup$
– Picaud Vincent
Feb 1 at 12:09
$begingroup$
You're welcome.
$endgroup$
– Henrik Schumacher
Feb 1 at 12:12
3
$begingroup$
This definitely works, though it's good to notice that this sets aSubValueformyType, not anUpValue.
$endgroup$
– Sjoerd Smit
Feb 1 at 13:35
add a comment |
$begingroup$
Thanks again Henrik, my questions are too easy :-)
$endgroup$
– Picaud Vincent
Feb 1 at 12:09
$begingroup$
You're welcome.
$endgroup$
– Henrik Schumacher
Feb 1 at 12:12
3
$begingroup$
This definitely works, though it's good to notice that this sets aSubValueformyType, not anUpValue.
$endgroup$
– Sjoerd Smit
Feb 1 at 13:35
$begingroup$
Thanks again Henrik, my questions are too easy :-)
$endgroup$
– Picaud Vincent
Feb 1 at 12:09
$begingroup$
Thanks again Henrik, my questions are too easy :-)
$endgroup$
– Picaud Vincent
Feb 1 at 12:09
$begingroup$
You're welcome.
$endgroup$
– Henrik Schumacher
Feb 1 at 12:12
$begingroup$
You're welcome.
$endgroup$
– Henrik Schumacher
Feb 1 at 12:12
3
3
$begingroup$
This definitely works, though it's good to notice that this sets a
SubValue for myType, not an UpValue.$endgroup$
– Sjoerd Smit
Feb 1 at 13:35
$begingroup$
This definitely works, though it's good to notice that this sets a
SubValue for myType, not an UpValue.$endgroup$
– Sjoerd Smit
Feb 1 at 13:35
add a comment |
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