23 lines
675 B
Rust
23 lines
675 B
Rust
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macro_rules! TryFromU32 {
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derive() (
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$(#[$meta:meta])*
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$vis:vis enum $Type:ident {
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$(
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$(#[$varmeta:meta])*
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$Variant:ident $(= $discr:expr)?
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),* $(,)?
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}
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) => {
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impl ::core::convert::TryFrom<u32> for $Type {
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type Error = u32;
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#[allow(deprecated)] // Don't warn about deprecated variants.
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fn try_from(value: u32) -> ::core::result::Result<$Type, Self::Error> {
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$( if value == const { $Type::$Variant as u32 } { return Ok($Type::$Variant) } )*
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Err(value)
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}
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}
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}
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}
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pub(crate) use TryFromU32;
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