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[Merged by Bors] - revert supporting generics for deriving TypeUuid #2204

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NathanSWard
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This reverts some of the changes made in #2044 as supporting generics for a #[derive(TypeUuid)] should not work as each generic instantiation would have the same uuid.

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@alice-i-cecile alice-i-cecile added C-Bug An unexpected or incorrect behavior A-Core Common functionality for all bevy apps labels May 17, 2021
@NathanSWard NathanSWard force-pushed the nward/type-uuid-revent-generic-derive branch from 6988479 to d547322 Compare May 17, 2021 19:44
@NathanSWard NathanSWard force-pushed the nward/type-uuid-revent-generic-derive branch from d547322 to 9c32164 Compare May 17, 2021 19:50
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cart commented May 17, 2021

bors r+

bors bot pushed a commit that referenced this pull request May 17, 2021
This reverts some of the changes made in #2044 as supporting generics for a `#[derive(TypeUuid)]` should not work as each generic instantiation would have the same uuid.

Stems from [this conversation](#2044 (comment))
@bors bors bot changed the title revert supporting generics for deriving TypeUuid [Merged by Bors] - revert supporting generics for deriving TypeUuid May 17, 2021
@bors bors bot closed this May 17, 2021
ostwilkens pushed a commit to ostwilkens/bevy that referenced this pull request Jul 27, 2021
This reverts some of the changes made in bevyengine#2044 as supporting generics for a `#[derive(TypeUuid)]` should not work as each generic instantiation would have the same uuid.

Stems from [this conversation](bevyengine#2044 (comment))
bors bot pushed a commit that referenced this pull request Apr 26, 2022
Support for deriving `TypeUuid` for types with generics was initially added in #2044 but later reverted #2204 because it lead to `MyStruct<A>` and `MyStruct<B>` having the same type uuid.

This PR fixes this by generating code like
```rust
#[derive(TypeUuid)]
#[uuid = "69b09733-a21a-4dab-a444-d472986bd672"]
struct Type<T>(T);

impl<T: TypeUuid> TypeUuid for Type<T> {
  const TYPE_UUID: TypeUuid = generate_compound_uuid(Uuid::from_bytes([/* 69b0 uuid */]), T::TYPE_UUID);
}
```

where `generate_compound_uuid` will XOR the non-metadata bits of the two UUIDs.

Co-authored-by: XBagon <[email protected]>
Co-authored-by: Jakob Hellermann <[email protected]>
exjam pushed a commit to exjam/bevy that referenced this pull request May 22, 2022
Support for deriving `TypeUuid` for types with generics was initially added in bevyengine#2044 but later reverted bevyengine#2204 because it lead to `MyStruct<A>` and `MyStruct<B>` having the same type uuid.

This PR fixes this by generating code like
```rust
#[derive(TypeUuid)]
#[uuid = "69b09733-a21a-4dab-a444-d472986bd672"]
struct Type<T>(T);

impl<T: TypeUuid> TypeUuid for Type<T> {
  const TYPE_UUID: TypeUuid = generate_compound_uuid(Uuid::from_bytes([/* 69b0 uuid */]), T::TYPE_UUID);
}
```

where `generate_compound_uuid` will XOR the non-metadata bits of the two UUIDs.

Co-authored-by: XBagon <[email protected]>
Co-authored-by: Jakob Hellermann <[email protected]>
ItsDoot pushed a commit to ItsDoot/bevy that referenced this pull request Feb 1, 2023
Support for deriving `TypeUuid` for types with generics was initially added in bevyengine#2044 but later reverted bevyengine#2204 because it lead to `MyStruct<A>` and `MyStruct<B>` having the same type uuid.

This PR fixes this by generating code like
```rust
#[derive(TypeUuid)]
#[uuid = "69b09733-a21a-4dab-a444-d472986bd672"]
struct Type<T>(T);

impl<T: TypeUuid> TypeUuid for Type<T> {
  const TYPE_UUID: TypeUuid = generate_compound_uuid(Uuid::from_bytes([/* 69b0 uuid */]), T::TYPE_UUID);
}
```

where `generate_compound_uuid` will XOR the non-metadata bits of the two UUIDs.

Co-authored-by: XBagon <[email protected]>
Co-authored-by: Jakob Hellermann <[email protected]>
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3 participants