Comments (4)
You can use if let
for this: https://doc.rust-lang.org/rust-by-example/flow_control/if_let.html. Unless I read your problem incorrectly.
if let DekuTest::Var4 { field_a, field_b } = &deku_test {
println!("{field_a:?} {field_b:?}");
}
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I see, sorry was thinking about this the wrong way - have multiple arms there so trying to write this as a matcher, but this seems to do the trick - thank you!
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@wcampbell0x2a: accessing for reads does work this way, but changes to mutable elements do not.
Even manually assigning the vectors resulting from a changed element in nested access does not alter the contents of packet
in this code or even selected
- the s.val
i'm setting to 0
here is still 1
when spat out from the debug_println!
macro:
let mut data_pkt = Data::try_from(&packet.data[..]).unwrap();
match AdditionalOptions::try_from(&data_pkt.data[..]) {
Ok(ao) => {
for service in &ao.svcs {
if let SvcBody::ENCRYPT { version: _, algos: _, selected } = service.svc {
match selected {
Some(mut s) => {
s.val = 0;
}
None => {}
};
debug_println!("{:?}", &selected);
}
};
debug_println!("{:?}", &ao);
data_pkt.data = ao.try_into()?;
packet.data = data_pkt.try_into()?;
},
Err(_) => {}
}
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This probably warrants docs all around, but getting changes to persist is far from straightforward. The mutable iterator requirement is normal Rust borrow checker stuff, but persisting the value of selected
requires a mutable ref
...
let mut ao = AdditionalOptions::try_from(c.data.as_ref())?;
for service in &mut ao.svcs {
if let SvcBody::ENCRYPT { version: _, algos: _, ref mut selected } = service.svc {
match *selected {
Some(_s) => {
*selected = None;
service.hdr.sub_packets = service.hdr.sub_packets - 1;
}
None => {}
};
}
};
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Related Issues (20)
- Replacing indices with references during parsing.
- Under / over-sized buffer parsing HOT 5
- Enable MIRI testing
- Help passing context around HOT 1
- Revisit enum id & type
- How to properly debug Deku input data? HOT 4
- Seemingly nonsensical vector count/read_size error HOT 2
- Conditional DekuWrite HOT 3
- Error: Parse("Too much data") using custom readers HOT 1
- Cant "count" from Some(field) directly - need as_ref().unwrap() HOT 1
- Passing a struct in ctx creates opaque error HOT 7
- Doc request: update for structs
- Assert for tuple enum HOT 1
- Working with elements of Vec<StructUsingDeku> to get sum of their byte-sizes HOT 4
- Weird parsing with `bool` and non-aligned data. HOT 4
- Is there a way to pad by a variable number of bytes? HOT 3
- Roll a release? HOT 12
- Performance of `read_all` and `count` HOT 2
- Ability to ignore excess bytes HOT 1
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