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Convert repetitive target_pointer_width checks to const solution. #76481

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merged 2 commits into from
Sep 10, 2020
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Convert repetitive target_pointer_width checks to const solution. #76481

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c3c84ad
Convert MAXIMUM_ZST_CAPACITY to be calculated in a
moonheart08 Sep 8, 2020
e02952c
Update library/alloc/src/collections/vec_deque.rs
moonheart08 Sep 8, 2020
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8 changes: 2 additions & 6 deletions library/alloc/src/collections/vec_deque.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -32,12 +32,8 @@ mod tests;

const INITIAL_CAPACITY: usize = 7; // 2^3 - 1
const MINIMUM_CAPACITY: usize = 1; // 2 - 1
#[cfg(target_pointer_width = "16")]
const MAXIMUM_ZST_CAPACITY: usize = 1 << (16 - 1); // Largest possible power of two
#[cfg(target_pointer_width = "32")]
const MAXIMUM_ZST_CAPACITY: usize = 1 << (32 - 1); // Largest possible power of two
#[cfg(target_pointer_width = "64")]
const MAXIMUM_ZST_CAPACITY: usize = 1 << (64 - 1); // Largest possible power of two

const MAXIMUM_ZST_CAPACITY: usize = 1 << ((core::mem::size_of::<usize>() << 3) - 1); // Largest possible power of two
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/// A double-ended queue implemented with a growable ring buffer.
///
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