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Make zero-capacity ArrayVec a zero-sized type.

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This commit is contained in:
Clar Charr
2017-09-26 11:55:00 -04:00
committed by Clar Fon
parent 16aabf7c2c
commit 55bedc922a
2 changed files with 24 additions and 3 deletions
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src/array.rs
+19 -3
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@@ -32,6 +32,20 @@ pub trait ArrayExt : Array {
impl<A> ArrayExt for A where A: Array { }
impl Index for () {
#[inline(always)]
fn to_usize(self) -> usize { 0 }
#[inline(always)]
fn from(ix: usize) -> Self { () }
}
impl Index for bool {
#[inline(always)]
fn to_usize(self) -> usize { self as usize }
#[inline(always)]
fn from(ix: usize) -> Self { ix != 0 }
}
impl Index for u8 {
#[inline(always)]
fn to_usize(self) -> usize { self as usize }
@@ -83,9 +97,11 @@ macro_rules! fix_array_impl_recursive {
);
}
fix_array_impl_recursive!(u8, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
32, 40, 48, 50, 56, 64, 72, 96, 100, 128, 160, 192, 200, 224,);
fix_array_impl_recursive!((), 0,);
fix_array_impl_recursive!(bool, 1,);
fix_array_impl_recursive!(u8, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17,
18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32,
40, 48, 50, 56, 64, 72, 96, 100, 128, 160, 192, 200, 224,);
fix_array_impl_recursive!(u16, 256, 384, 512, 768, 1024, 2048, 4096, 8192, 16384, 32768,);
// This array size doesn't exist on 16-bit
#[cfg(any(target_pointer_width="32", target_pointer_width="64"))]