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FromPrimitive with values not covered by existing enum #31

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soumya92 opened this issue Aug 30, 2019 · 0 comments

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enhancement help wanted

soumya92 commented Aug 30, 2019 •

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If I have

enum Foo {
  FooA = 3,
  FooB = 7,
  OtherFoo(u8),
}

it would be nice to have some way to specify that:

Foo::from_u8(3) == Some(FooA),
Foo::from_u16(7) == Some(FooB),
Foo::from_u8(4) == Some(FooOther(4)),
Foo::from_i32(5) == Some(FooOther(5)),
Foo::from_i32(1024) == None,
...

soumya92 changed the title ~~FromPrimitive with values outside enum range~~ FromPrimitive with values not covered by existing enum

cuviper added enhancement help wanted labels

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