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Removing match on constant #888

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Apr 9, 2016
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Removing match on constant #888

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405a6bf
Removing match on constant
Apr 6, 2016
0ef6de9
Update account.rs
gavofyork Apr 9, 2016
04d5b5c
Merge branch 'master' into h256
Apr 9, 2016
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2 changes: 1 addition & 1 deletion ethcore/src/account.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -138,7 +138,7 @@ impl Account {
/// get someone who knows to call `note_code`.
pub fn code(&self) -> Option<&[u8]> {
match self.code_hash {
Some(c) if c == SHA3_EMPTY && self.code_cache.is_empty() => Some(&self.code_cache),
Some(c) if c == SHA3_EMPTY && self.code_cache.is_empty() => Some(&self.code_cache),
Some(_) if !self.code_cache.is_empty() => Some(&self.code_cache),
None => Some(&self.code_cache),
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Does this actually make sense? Before this refactor we were matching None twice:

None if self.code_cache.is_empty() => Some(&self.code_cache),
None => Some(&self.code_cache),

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Looks like it does not. None matches to Some(&self.code_cache) in all cases
@gavofyork please take a look, might be a bug in the original code.

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the original code (https://github.com/ethcore/parity/blob/master/ethcore/src/account.rs) was:

Some(c) if c == SHA3_EMPTY  && self.code_cache.is_empty() => Some(&self.code_cache),
Some(_) if !self.code_cache.is_empty() => Some(&self.code_cache),
None => Some(&self.code_cache),
_ => None,

there are no options here which are superfluous.

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The code from master already contains this change (was included with #889 - otherwise there was compilation error on nightly).
This is what it looked like before:
https://github.com/ethcore/parity/blob/61420d3c9c64d87ab2c83d972c7d2d812b1d9b72/ethcore/src/account.rs#L141

The logic wasn't different, but there was superfluous | None in first branch.
My question is rather if when this method should return None - currently it's only the case when code_hash == SHA3_EMPTY && !code_cache.is_empty() OR code_hash != SHA3_EMPTY && code_cache.is_empty() - this is correct?

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Correct (technically, the first is actually a logic error and should properly be either asserted against or an error). The second (i.e. there is definitely some non-empty code, but it isn't presently cached) properly returns None.

_ => None,
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