Statically assert zero-cost invariants

Since some or all of those invariants will come in handy to ensure we
use as little memory as possible, to maximize the speed of the move
generation later on.
This commit is contained in:
Bruno BELANYI 2022-07-18 11:05:38 +02:00
parent d51d72377e
commit 585c127381
4 changed files with 17 additions and 0 deletions

View file

@ -1,4 +1,6 @@
use super::Square; use super::Square;
use crate::utils::static_assert;
mod iterator; mod iterator;
use iterator::*; use iterator::*;
@ -63,6 +65,9 @@ impl Bitboard {
} }
} }
// Ensure zero-cost (at least size-wise) wrapping.
static_assert!(std::mem::size_of::<Bitboard>() == std::mem::size_of::<u64>());
impl Default for Bitboard { impl Default for Bitboard {
fn default() -> Self { fn default() -> Self {
Self::EMPTY Self::EMPTY

View file

@ -1,4 +1,5 @@
use super::Bitboard; use super::Bitboard;
use crate::utils::static_assert;
/// An enum representing a singular file on a chess board (i.e: the columns). /// An enum representing a singular file on a chess board (i.e: the columns).
#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)] #[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
@ -74,6 +75,9 @@ impl File {
} }
} }
// Ensure that niche-optimization is in effect.
static_assert!(std::mem::size_of::<Option<File>>() == std::mem::size_of::<File>());
#[cfg(test)] #[cfg(test)]
mod test { mod test {
use super::*; use super::*;

View file

@ -1,4 +1,5 @@
use super::Bitboard; use super::Bitboard;
use crate::utils::static_assert;
/// An enum representing a singular rank on a chess board (i.e: the rows). /// An enum representing a singular rank on a chess board (i.e: the rows).
#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)] #[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
@ -74,6 +75,9 @@ impl Rank {
} }
} }
// Ensure that niche-optimization is in effect.
static_assert!(std::mem::size_of::<Option<Rank>>() == std::mem::size_of::<Rank>());
#[cfg(test)] #[cfg(test)]
mod test { mod test {
use super::*; use super::*;

View file

@ -1,4 +1,5 @@
use super::{Bitboard, File, Rank}; use super::{Bitboard, File, Rank};
use crate::utils::static_assert;
/// Represent a square on a chessboard. Defined in the same order as the /// Represent a square on a chessboard. Defined in the same order as the
/// [Bitboard](crate::board::Bitboard) squares. /// [Bitboard](crate::board::Bitboard) squares.
@ -185,6 +186,9 @@ impl std::ops::Sub<Bitboard> for Square {
} }
} }
// Ensure that niche-optimization is in effect.
static_assert!(std::mem::size_of::<Option<Square>>() == std::mem::size_of::<Square>());
#[cfg(test)] #[cfg(test)]
mod test { mod test {
use super::*; use super::*;