Thank you for the help. I've try this signature and I had an compile
error. I thought it came from the signature but the problem when from
the call.
It works now.
For the return type @mut MemWriter I work on the json doc and some
example of use. I can make the change. I didn't find the issue about it.
Did you create it?
Philippe
Le 28/11/2013 22:27, Erick Tryzelaar a écrit :
Good afternoon Phillippe,
Here's how to do it, assuming you're using rust 0.8 and the json library:
```
#[feature(managed_boxes)];
extern mod extra;
use std::io::mem::MemWriter;
use extra::serialize::{Encoder, Encodable};
use extra::json;
pub fn memory_encode<
T: Encodable<json::Encoder>
>(to_encode_object: &T) -> @mut MemWriter {
//Serialize the object in a string using a writer
let m = @mut MemWriter::new();
let mut encoder = json::Encoder(m as @mut Writer);
to_encode_object.encode(&mut encoder);
m
}
fn main() {
}
```
Regarding the trouble returning a `MemWriter` instead of a `@mut
MemWriter`, the easiest thing would be to fix library to use `&mut
...` instead of `@mut ...`. I'll put in a PR to do that.
On Thu, Nov 28, 2013 at 3:55 AM, Philippe Delrieu
<[email protected] <mailto:[email protected]>> wrote:
I try to develop a function that take a Encodable parameter but I
have the error wrong number of type arguments: expected 1 but found 0
pub fn memory_encode(to_encode_object: &serialize::Encodable) ->
@mut MemWriter {
//Serialize the object in a string using a writer
let m = @mut MemWriter::new();
let mut encoder = Encoder(m as @mut Writer);
to_encode_object.encode(&mut encoder);
m
}
The encodable trait is :
pub trait Encodable<S:Encoder> {
fn encode(&self, s: &mut S);
}
I try this definition
memory_encode<T:serialize::Encodable<Encoder>>(to_encode_object:
&T) -> @mut MemWriter
But I can't use the method with a struct that implement Encodable.
The error : mismatched types: expected `&<V31>` but found ..
I have another question :
I would like to return a MemWriter and not a @mut MemWriter . I
didn't find a way to convert the @mut to ~
Philippe Delrieu
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