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Provide access to the underlying container of writers in the common case #108

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Provide access to the underlying container of writers in the common case #108

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20 changes: 20 additions & 0 deletions src/types/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -83,6 +83,12 @@ pub trait ByteWriter {

/// Writes a number of bytes.
fn write_bytes(&mut self, v: &[u8]);

/// If this `ByteWriter` is a `Vec<u8>`, returns a mutable reference to
/// `self` as `Some(&mut Vec<u8>)`. Returns `None` otherwise.
fn as_mut_vec(&mut self) -> Option<&mut Vec<u8>> {
None
}
}

impl ByteWriter for Vec<u8> {
Expand All @@ -97,6 +103,10 @@ impl ByteWriter for Vec<u8> {
fn write_bytes(&mut self, v: &[u8]) {
self.extend_from_slice(v);
}

fn as_mut_vec(&mut self) -> Option<&mut Vec<u8>> {
Some(self)
}
}

/// String writer used by decoders. In most cases this will be an owned string.
Expand All @@ -114,6 +124,12 @@ pub trait StringWriter {

/// Writes a string.
fn write_str(&mut self, s: &str);

/// If this `StringWriter` is a `String`, returns a mutable reference to
/// `self` as `Some(&mut String)`. Returns `None` otherwise.
fn as_mut_string(&mut self) -> Option<&mut String> {
None
}
}

impl StringWriter for String {
Expand All @@ -128,6 +144,10 @@ impl StringWriter for String {
fn write_str(&mut self, s: &str) {
self.push_str(s);
}

fn as_mut_string(&mut self) -> Option<&mut String> {
Some(self)
}
}

/// Encoder converting a Unicode string into a byte sequence.
Expand Down