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// Copyright 2024 Saptak Santra
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//! Entity identifiers and location metadata.
use slotmap::new_key_type;
new_key_type! {
/// Unique entity identifier backed by slotmap's generational keys.
pub struct EntityId;
}
impl std::fmt::Display for EntityId {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
use slotmap::Key;
let ffi = self.data().as_ffi();
write!(f, "E{}v{}", ffi & 0xFFFFFFFF, ffi >> 32)
}
}
/// Entity location in archetype (archetype_id, row)
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct EntityLocation {
pub archetype_id: usize,
pub archetype_row: usize,
}