8e4fd942a9
This refactors the widget state storage introduced by @optozorax in https://github.com/emilk/egui/pull/257 * Unify the four buckets (`data`, `data_temp`, `id_data` and `id_data_temp`) into a single `data`. * Less complexity, and also less chance of error (storing in one bucket, reading from another). * Store data by `Id` and `TypeId`. * Users can thus reuse the same `Id` to store many types. * Uses a simple xor of id and typeid, which is fast and good since both id and typeid are already high-entropy hashes. * Use different suffixes on the functions to pick if you want the data persisted or not (`get_temp`, `insert_persisted`, etc). * Writing with one suffix and reading with the other works. * To store state not bound to a specific `Id` (i.e. only based on type), use the new `Id::null` as the key.
15 lines
458 B
Rust
15 lines
458 B
Rust
/// Hash the given value with a predictable hasher.
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#[inline]
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pub fn hash(value: impl std::hash::Hash) -> u64 {
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use std::hash::Hasher as _;
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let mut hasher = ahash::AHasher::new_with_keys(123, 456);
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value.hash(&mut hasher);
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hasher.finish()
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}
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/// Hash the given value with the given hasher.
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#[inline]
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pub fn hash_with(value: impl std::hash::Hash, mut hasher: impl std::hash::Hasher) -> u64 {
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value.hash(&mut hasher);
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hasher.finish()
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}
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