Created
September 28, 2012 17:23
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| use io::Writer; | |
| use io::WriterUtil; | |
| trait Serializer { | |
| fn emit_uint(&self, v: uint); | |
| } | |
| trait Serializable<S: Serializer> { | |
| fn serialize(&self, s: &S); | |
| } | |
| impl<S: Serializer> uint: Serializable<S> { | |
| fn serialize(&self, s: &S) { s.emit_uint(*self) } | |
| } | |
| pub struct UglySerializer { | |
| wr: io::Writer, | |
| } | |
| pub fn UglySerializer(wr: io::Writer) -> UglySerializer { | |
| UglySerializer { wr: wr } | |
| } | |
| pub impl UglySerializer: Serializer { | |
| fn emit_uint(&self, v: uint) { | |
| self.wr.write_str(fmt!("ugly %?u", v)); | |
| } | |
| } | |
| pub struct PrettySerializer { | |
| wr: io::Writer, | |
| } | |
| pub fn PrettySerializer(wr: io::Writer) -> PrettySerializer { | |
| PrettySerializer { wr: wr } | |
| } | |
| pub impl PrettySerializer: Serializer { | |
| fn emit_uint(&self, v: uint) { | |
| self.wr.write_str(fmt!("pretty %?u", v)); | |
| } | |
| } | |
| fn print2< | |
| S1: Serializer, | |
| S2: Serializer, | |
| T: Serializable<S1> Serializable<S2> | |
| >(t: T, s1: &S1, s2: &S2) { | |
| t.serialize(s1); | |
| io::println(""); | |
| t.serialize(s2); | |
| io::println(""); | |
| } | |
| fn main() { | |
| print2(5u, &UglySerializer(io::stdout()), &PrettySerializer(io::stdout())); | |
| } |
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