Hello everyone,
I have a question about making "extension methods" on something like
io::Writer. Basically, I have a data format that requires strings to be
serialized as an 8-byte length header and then the string bytes themselves.
Instead of having to type writer.write_u64(...); writer.write_str(...);
over and over again, I would like to implement some "extension methods" or
something like that on io::Writer, like the following pseudocode:
trait MySerialization {
fn write_my_string(&mut self, s: &str) -> io::IoResult<()>;
}
impl MySerialization for io::Writer {
fn write_my_string(&mut self, s: &str) -> io::IoResult<()> {
try!(self.write_u64(s.len());
self.write_str(s);
}
}
However, this of course doesn't work, because I can't implement a trait for
a trait. Rustc says: "reference to trait `io::Writer` where a type is
expected; try `@io::Writer`, `~io::Writer`, or `&io::Writer`", however when
I try "&io::Writer" as suggested, rustc complains about lifetimes. Is this
sort of thing possible in Rust?
Thanks for your help!
- Frank
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