| 1 | //! An example of implementing the `BitFlags` trait manually for a flags type. |
| 2 | |
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| 3 | use std::str; |
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| 4 | |
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| 5 | use bitflags::bitflags; |
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| 6 | |
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| 7 | // Define a flags type outside of the `bitflags` macro as a newtype |
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| 8 | // It can accept custom derives for libaries `bitflags` doesn't support natively |
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| 9 | #[derive(zerocopy::AsBytes, zerocopy::FromBytes)] |
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| 10 | #[repr (transparent)] |
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| 11 | pub struct ManualFlags(u32); |
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| 12 | |
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| 13 | // Next: use `impl Flags` instead of `struct Flags` |
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| 14 | bitflags! { |
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| 15 | impl ManualFlags: u32 { |
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| 16 | const A = 0b00000001; |
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| 17 | const B = 0b00000010; |
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| 18 | const C = 0b00000100; |
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| 19 | const ABC = Self::A.bits() | Self::B.bits() | Self::C.bits(); |
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| 20 | } |
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| 21 | } |
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| 22 | |
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| 23 | fn main() {} |
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| 24 | |
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