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mod behavior;
mod blocks;
pub use behavior::BlockBehavior;
pub use blocks::*;
use std::mem;
impl BlockState {
/// Transmutes a u32 to a block state. UB if the value is not a valid block
/// state.
#[inline]
pub unsafe fn from_u32_unsafe(state_id: u32) -> Self {
mem::transmute::<u32, BlockState>(state_id)
}
#[inline]
pub fn is_valid_state(state_id: u32) -> bool {
state_id <= Self::max_state()
}
}
impl TryFrom<u32> for BlockState {
type Error = ();
/// Safely converts a state id to a block state.
fn try_from(state_id: u32) -> Result<Self, Self::Error> {
if Self::is_valid_state(state_id) {
Ok(unsafe { Self::from_u32_unsafe(state_id) })
} else {
Err(())
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_from_u32() {
assert_eq!(BlockState::try_from(0).unwrap(), BlockState::Air);
assert!(BlockState::try_from(BlockState::max_state()).is_ok());
assert!(BlockState::try_from(BlockState::max_state() + 1).is_err());
}
}
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