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30 lines
810 B
Rust
30 lines
810 B
Rust
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use crate::*;
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/// Provides the one-byte "selector" from the SSZ union specification:
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///
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/// https://github.com/ethereum/consensus-specs/blob/v1.1.0-beta.3/ssz/simple-serialize.md#union
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#[derive(Copy, Clone)]
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pub struct UnionSelector(u8);
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impl From<UnionSelector> for u8 {
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fn from(union_selector: UnionSelector) -> u8 {
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union_selector.0
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}
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}
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impl PartialEq<u8> for UnionSelector {
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fn eq(&self, other: &u8) -> bool {
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self.0 == *other
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}
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}
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impl UnionSelector {
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/// Instantiate `self`, returning an error if `selector > MAX_UNION_SELECTOR`.
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pub fn new(selector: u8) -> Result<Self, DecodeError> {
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Some(selector)
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.filter(|_| selector <= MAX_UNION_SELECTOR)
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.map(Self)
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.ok_or(DecodeError::UnionSelectorInvalid(selector))
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}
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}
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