[−][src]Trait fnum::Fnum
Fnum trait providing Fnum::size_of_variant
method.
Required methods
pub fn variant_count() -> usize
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Returns the number of variants the enum has.
pub fn variant_index(&self) -> usize
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Returns the index of variant.
#[derive(Fnum)] enum MyEnum { FIrst, Second, } assert_eq!(MyEnum::First.variant_index(), 0); assert_eq!(MyEnum::Second.variant_index(), 1);
pub unsafe fn uninit_variant(idx: usize) -> Self
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Create an enum value that has uninitialized fields.
DO NOT drop the returned value, use std::mem::forget
.
pub fn size_of_variant(idx: usize) -> usize
[src]
Returns the minimum size that specified variant requiring.