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emit_value && emit_array do not have constrains regarding type

This commit is contained in:
debris 2015-11-25 21:14:53 +01:00
parent c5163b796f
commit c47bf0ce5f
1 changed files with 15 additions and 12 deletions
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27
src/rlp.rs
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@ -309,19 +309,26 @@ pub trait Encodable {
pub trait Encoder {
type Error;
fn emit_value<V>(&mut self, value: &V) -> Result<(), Self::Error> where V: Encodable + ToBytes;
fn emit_array<V>(&mut self, array: &[V]) -> Result<(), Self::Error> where V: Encodable;
fn emit_value(&mut self, bytes: &[u8]) -> Result<(), Self::Error>;
fn emit_array<F>(&mut self, f: F) -> Result<(), Self::Error> where
F: FnOnce(&mut Self) -> Result<(), Self::Error>;
}
impl <T> Encodable for T where T: ToBytes {
fn encode<E>(&self, encoder: &mut E) -> Result<(), E::Error> where E: Encoder {
encoder.emit_value(self)
encoder.emit_value(&self.to_bytes())
}
}
impl <'a, T> Encodable for &'a [T] where T: Encodable + 'a {
fn encode<E>(&self, encoder: &mut E) -> Result<(), E::Error> where E: Encoder {
encoder.emit_array(self)
encoder.emit_array(|e| {
// insert all array elements
for el in self.iter() {
try!(el.encode(e));
}
Ok(())
})
}
}
@ -372,10 +379,7 @@ impl BasicEncoder {
impl Encoder for BasicEncoder {
type Error = EncoderError;
fn emit_value<V>(&mut self, value: &V) -> Result<(), Self::Error> where V: Encodable + ToBytes {
let v = value.to_bytes();
let bytes: &[u8] = v.as_ref();
fn emit_value(&mut self, bytes: &[u8]) -> Result<(), Self::Error> {
match bytes.len() {
// just 0
0 => { try!(self.bytes.write(&[0x80u8])); },
@ -396,15 +400,14 @@ impl Encoder for BasicEncoder {
Ok(())
}
fn emit_array<V>(&mut self, array: &[V]) -> Result<(), Self::Error> where V: Encodable {
fn emit_array<F>(&mut self, f: F) -> Result<(), Self::Error> where
F: FnOnce(&mut Self) -> Result<(), Self::Error> {
// get len before inserting an array
let before_len = self.bytes.len();
// insert all array elements
for el in array.iter() {
try!(el.encode(self));
}
try!(f(self));
// get len after inserting an array
let after_len = self.bytes.len();