Crate plctag_derive 

plctag-derive

macros for plctag

Usage

please use it with plctag

With this crate, the macros derive plctag_core::Decode and plctag_core::Encode for you automatically.

Examples

use plctag_core::{RawTag, Result, ValueExt};
use plctag_derive::{Decode, Encode};

#[derive(Debug, Default, Decode, Encode)]
struct MyUDT {
    #[tag(offset=0)]
    a: u32,
    #[tag(offset=4)]
    b: u32,
    #[tag(decode_fn="my_decode", encode_fn="my_encode")]
    c: u32,
 }

fn my_decode(tag:&RawTag, offset: u32)->plctag::Result<u32> {
    tag.get_u32(offset + 8).map(|v|v+1)
}

fn my_encode(v: &u32, tag: &RawTag, offset: u32)->plctag::Result<()> {
    tag.set_u32(offset + 8, *v - 1)
}

let tag = RawTag::new("make=system&family=library&name=debug&debug=4", 100).unwrap();
let res = tag.read(100);
assert!(res.is_ok());
let udt: MyUDT = tag.get_value(0).unwrap();
assert_eq!(udt.a, 4);
assert_eq!(udt.b, 0);

License

MIT

Derive Macros

Decode

the macro derives plctag_core::Decode for you automatically.

Encode

the macro derives plctag_core::Encode for you automatically.