33 lines
891 B
Rust
33 lines
891 B
Rust
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#[macro_export]
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macro_rules! numeric_enum {
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(#[repr($repr:ident)]
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$(#$attrs:tt)* $vis:vis enum $name:ident {
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$($(#$enum_attrs:tt)* $enum:ident = $constant:expr),* $(,)?
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} ) => {
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#[repr($repr)]
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$(#$attrs)*
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$vis enum $name {
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$($(#$enum_attrs)* $enum = $constant),*
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}
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impl ::core::convert::TryFrom<$repr> for $name {
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type Error = ();
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fn try_from(value: $repr) -> ::core::result::Result<Self, ()> {
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match value {
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$($constant => Ok( $name :: $enum ),)*
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_ => Err(())
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}
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}
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}
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impl ::core::convert::From<$name> for $repr {
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fn from(value: $name) -> $repr {
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match value {
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$($name :: $enum => $constant,)*
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}
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}
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}
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}
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}
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