Rollup merge of rust-lang#58628 - RReverser:optimise-vec-false, r=oli…

…-obk Optimise vec![false; N] to zero-alloc Nowadays booleans have a well-defined representation, so there is no reason not to optimise their allocation.
Centril · Feb 23, 2019 · 2841c45 · 2841c45
2 parents 8829866 + 9f58c5f
commit 2841c45
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/src/liballoc/vec.rs b/src/liballoc/vec.rs
@@ -1610,6 +1610,7 @@ impl_is_zero!(u64, |x| x == 0);
 impl_is_zero!(u128, |x| x == 0);
 impl_is_zero!(usize, |x| x == 0);
 
+impl_is_zero!(bool, |x| x == false);
 impl_is_zero!(char, |x| x == '\0');
 
 impl_is_zero!(f32, |x: f32| x.to_bits() == 0);