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</pre><pre class="rust"><code><span class="kw">use super</span>::<span class="kw-2">*</span>;
<span class="doccomment">/// Trait for types that can be safely created with
/// [`zeroed`](core::mem::zeroed).
///
/// An all-zeroes value may or may not be the same value as the
/// [Default](core::default::Default) value of the type.
///
/// ## Safety
///
/// * Your type must be inhabited (eg: no
/// [Infallible](core::convert::Infallible)).
/// * Your type must be allowed to be an &quot;all zeroes&quot; bit pattern (eg: no
/// [`NonNull&lt;T&gt;`](core::ptr::NonNull)).
///
/// ## Features
///
/// Some `impl`s are feature gated due to the MSRV policy:
///
/// * `MaybeUninit&lt;T&gt;` was not available in 1.34.0, but is available under the
/// `zeroable_maybe_uninit` feature flag.
/// * `Atomic*` types require Rust 1.60.0 or later to work on certain platforms, but is available
/// under the `zeroable_atomics` feature flag.
/// * `[T; N]` for arbitrary `N` requires the `min_const_generics` feature flag.
</span><span class="kw">pub unsafe trait </span>Zeroable: Sized {
<span class="doccomment">/// Calls [`zeroed`](core::mem::zeroed).
///
/// This is a trait method so that you can write `MyType::zeroed()` in your
/// code. It is a contract of this trait that if you implement it on your type
/// you **must not** override this method.
</span><span class="attribute">#[inline]
</span><span class="kw">fn </span>zeroed() -&gt; <span class="self">Self </span>{
<span class="kw">unsafe </span>{ core::mem::zeroed() }
}
}
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>() {}
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>bool {}
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>char {}
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>u8 {}
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>i8 {}
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>u16 {}
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>i16 {}
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>u32 {}
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>i32 {}
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>u64 {}
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>i64 {}
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>usize {}
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>isize {}
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>u128 {}
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>i128 {}
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>f32 {}
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>f64 {}
<span class="kw">unsafe impl</span>&lt;T: Zeroable&gt; Zeroable <span class="kw">for </span>Wrapping&lt;T&gt; {}
<span class="kw">unsafe impl</span>&lt;T: Zeroable&gt; Zeroable <span class="kw">for </span>core::cmp::Reverse&lt;T&gt; {}
<span class="comment">// Note: we can&#39;t implement this for all `T: ?Sized` types because it would
// create NULL pointers for vtables.
// Maybe one day this could be changed to be implemented for
// `T: ?Sized where &lt;T as core::ptr::Pointee&gt;::Metadata: Zeroable`.
</span><span class="kw">unsafe impl</span>&lt;T&gt; Zeroable <span class="kw">for </span><span class="kw-2">*mut </span>T {}
<span class="kw">unsafe impl</span>&lt;T&gt; Zeroable <span class="kw">for </span><span class="kw-2">*const </span>T {}
<span class="kw">unsafe impl</span>&lt;T&gt; Zeroable <span class="kw">for </span><span class="kw-2">*mut </span>[T] {}
<span class="kw">unsafe impl</span>&lt;T&gt; Zeroable <span class="kw">for </span><span class="kw-2">*const </span>[T] {}
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span><span class="kw-2">*mut </span>str {}
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span><span class="kw-2">*const </span>str {}
<span class="kw">unsafe impl</span>&lt;T: <span class="question-mark">?</span>Sized&gt; Zeroable <span class="kw">for </span>PhantomData&lt;T&gt; {}
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>PhantomPinned {}
<span class="kw">unsafe impl</span>&lt;T: Zeroable&gt; Zeroable <span class="kw">for </span>ManuallyDrop&lt;T&gt; {}
<span class="kw">unsafe impl</span>&lt;T: Zeroable&gt; Zeroable <span class="kw">for </span>core::cell::UnsafeCell&lt;T&gt; {}
<span class="kw">unsafe impl</span>&lt;T: Zeroable&gt; Zeroable <span class="kw">for </span>core::cell::Cell&lt;T&gt; {}
<span class="attribute">#[cfg(feature = <span class="string">&quot;zeroable_atomics&quot;</span>)]
</span><span class="kw">mod </span>atomic_impls {
<span class="kw">use </span><span class="kw">super</span>::Zeroable;
<span class="attribute">#[cfg(target_has_atomic = <span class="string">&quot;8&quot;</span>)]
</span><span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>core::sync::atomic::AtomicBool {}
<span class="attribute">#[cfg(target_has_atomic = <span class="string">&quot;8&quot;</span>)]
</span><span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>core::sync::atomic::AtomicU8 {}
<span class="attribute">#[cfg(target_has_atomic = <span class="string">&quot;8&quot;</span>)]
</span><span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>core::sync::atomic::AtomicI8 {}
<span class="attribute">#[cfg(target_has_atomic = <span class="string">&quot;16&quot;</span>)]
</span><span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>core::sync::atomic::AtomicU16 {}
<span class="attribute">#[cfg(target_has_atomic = <span class="string">&quot;16&quot;</span>)]
</span><span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>core::sync::atomic::AtomicI16 {}
<span class="attribute">#[cfg(target_has_atomic = <span class="string">&quot;32&quot;</span>)]
</span><span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>core::sync::atomic::AtomicU32 {}
<span class="attribute">#[cfg(target_has_atomic = <span class="string">&quot;32&quot;</span>)]
</span><span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>core::sync::atomic::AtomicI32 {}
<span class="attribute">#[cfg(target_has_atomic = <span class="string">&quot;64&quot;</span>)]
</span><span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>core::sync::atomic::AtomicU64 {}
<span class="attribute">#[cfg(target_has_atomic = <span class="string">&quot;64&quot;</span>)]
</span><span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>core::sync::atomic::AtomicI64 {}
<span class="attribute">#[cfg(target_has_atomic = <span class="string">&quot;ptr&quot;</span>)]
</span><span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>core::sync::atomic::AtomicUsize {}
<span class="attribute">#[cfg(target_has_atomic = <span class="string">&quot;ptr&quot;</span>)]
</span><span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>core::sync::atomic::AtomicIsize {}
<span class="attribute">#[cfg(target_has_atomic = <span class="string">&quot;ptr&quot;</span>)]
</span><span class="kw">unsafe impl</span>&lt;T&gt; Zeroable <span class="kw">for </span>core::sync::atomic::AtomicPtr&lt;T&gt; {}
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;zeroable_maybe_uninit&quot;</span>)]
</span><span class="kw">unsafe impl</span>&lt;T&gt; Zeroable <span class="kw">for </span>core::mem::MaybeUninit&lt;T&gt; {}
<span class="kw">unsafe impl</span>&lt;A: Zeroable&gt; Zeroable <span class="kw">for </span>(A,) {}
<span class="kw">unsafe impl</span>&lt;A: Zeroable, B: Zeroable&gt; Zeroable <span class="kw">for </span>(A, B) {}
<span class="kw">unsafe impl</span>&lt;A: Zeroable, B: Zeroable, C: Zeroable&gt; Zeroable <span class="kw">for </span>(A, B, C) {}
<span class="kw">unsafe impl</span>&lt;A: Zeroable, B: Zeroable, C: Zeroable, D: Zeroable&gt; Zeroable
<span class="kw">for </span>(A, B, C, D)
{
}
<span class="kw">unsafe impl</span>&lt;A: Zeroable, B: Zeroable, C: Zeroable, D: Zeroable, E: Zeroable&gt;
Zeroable <span class="kw">for </span>(A, B, C, D, E)
{
}
<span class="kw">unsafe impl</span>&lt;
A: Zeroable,
B: Zeroable,
C: Zeroable,
D: Zeroable,
E: Zeroable,
F: Zeroable,
&gt; Zeroable <span class="kw">for </span>(A, B, C, D, E, F)
{
}
<span class="kw">unsafe impl</span>&lt;
A: Zeroable,
B: Zeroable,
C: Zeroable,
D: Zeroable,
E: Zeroable,
F: Zeroable,
G: Zeroable,
&gt; Zeroable <span class="kw">for </span>(A, B, C, D, E, F, G)
{
}
<span class="kw">unsafe impl</span>&lt;
A: Zeroable,
B: Zeroable,
C: Zeroable,
D: Zeroable,
E: Zeroable,
F: Zeroable,
G: Zeroable,
H: Zeroable,
&gt; Zeroable <span class="kw">for </span>(A, B, C, D, E, F, G, H)
{
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;min_const_generics&quot;</span>)]
</span><span class="kw">unsafe impl</span>&lt;T, <span class="kw">const </span>N: usize&gt; Zeroable <span class="kw">for </span>[T; N] <span class="kw">where </span>T: Zeroable {}
<span class="attribute">#[cfg(not(feature = <span class="string">&quot;min_const_generics&quot;</span>))]
</span><span class="macro">impl_unsafe_marker_for_array!</span>(
Zeroable, <span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>, <span class="number">10</span>, <span class="number">11</span>, <span class="number">12</span>, <span class="number">13</span>, <span class="number">14</span>, <span class="number">15</span>, <span class="number">16</span>, <span class="number">17</span>, <span class="number">18</span>,
<span class="number">19</span>, <span class="number">20</span>, <span class="number">21</span>, <span class="number">22</span>, <span class="number">23</span>, <span class="number">24</span>, <span class="number">25</span>, <span class="number">26</span>, <span class="number">27</span>, <span class="number">28</span>, <span class="number">29</span>, <span class="number">30</span>, <span class="number">31</span>, <span class="number">32</span>, <span class="number">48</span>, <span class="number">64</span>, <span class="number">96</span>, <span class="number">128</span>, <span class="number">256</span>,
<span class="number">512</span>, <span class="number">1024</span>, <span class="number">2048</span>, <span class="number">4096
</span>);
<span class="attribute">#[cfg(all(target_arch = <span class="string">&quot;wasm32&quot;</span>, feature = <span class="string">&quot;wasm_simd&quot;</span>))]
</span><span class="macro">impl_unsafe_marker_for_simd!</span>(
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>wasm32::{v128}
);
<span class="attribute">#[cfg(all(target_arch = <span class="string">&quot;aarch64&quot;</span>, feature = <span class="string">&quot;aarch64_simd&quot;</span>))]
</span><span class="macro">impl_unsafe_marker_for_simd!</span>(
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>aarch64::{
float32x2_t, float32x2x2_t, float32x2x3_t, float32x2x4_t, float32x4_t,
float32x4x2_t, float32x4x3_t, float32x4x4_t, float64x1_t, float64x1x2_t,
float64x1x3_t, float64x1x4_t, float64x2_t, float64x2x2_t, float64x2x3_t,
float64x2x4_t, int16x4_t, int16x4x2_t, int16x4x3_t, int16x4x4_t, int16x8_t,
int16x8x2_t, int16x8x3_t, int16x8x4_t, int32x2_t, int32x2x2_t, int32x2x3_t,
int32x2x4_t, int32x4_t, int32x4x2_t, int32x4x3_t, int32x4x4_t, int64x1_t,
int64x1x2_t, int64x1x3_t, int64x1x4_t, int64x2_t, int64x2x2_t, int64x2x3_t,
int64x2x4_t, int8x16_t, int8x16x2_t, int8x16x3_t, int8x16x4_t, int8x8_t,
int8x8x2_t, int8x8x3_t, int8x8x4_t, poly16x4_t, poly16x4x2_t, poly16x4x3_t,
poly16x4x4_t, poly16x8_t, poly16x8x2_t, poly16x8x3_t, poly16x8x4_t,
poly64x1_t, poly64x1x2_t, poly64x1x3_t, poly64x1x4_t, poly64x2_t,
poly64x2x2_t, poly64x2x3_t, poly64x2x4_t, poly8x16_t, poly8x16x2_t,
poly8x16x3_t, poly8x16x4_t, poly8x8_t, poly8x8x2_t, poly8x8x3_t, poly8x8x4_t,
uint16x4_t, uint16x4x2_t, uint16x4x3_t, uint16x4x4_t, uint16x8_t,
uint16x8x2_t, uint16x8x3_t, uint16x8x4_t, uint32x2_t, uint32x2x2_t,
uint32x2x3_t, uint32x2x4_t, uint32x4_t, uint32x4x2_t, uint32x4x3_t,
uint32x4x4_t, uint64x1_t, uint64x1x2_t, uint64x1x3_t, uint64x1x4_t,
uint64x2_t, uint64x2x2_t, uint64x2x3_t, uint64x2x4_t, uint8x16_t,
uint8x16x2_t, uint8x16x3_t, uint8x16x4_t, uint8x8_t, uint8x8x2_t,
uint8x8x3_t, uint8x8x4_t,
}
);
<span class="attribute">#[cfg(target_arch = <span class="string">&quot;x86&quot;</span>)]
</span><span class="macro">impl_unsafe_marker_for_simd!</span>(
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>x86::{
__m128i, __m128, __m128d,
__m256i, __m256, __m256d,
}
);
<span class="attribute">#[cfg(target_arch = <span class="string">&quot;x86_64&quot;</span>)]
</span><span class="macro">impl_unsafe_marker_for_simd!</span>(
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>x86_64::{
__m128i, __m128, __m128d,
__m256i, __m256, __m256d,
}
);
<span class="attribute">#[cfg(feature = <span class="string">&quot;nightly_portable_simd&quot;</span>)]
</span><span class="kw">unsafe impl</span>&lt;T, <span class="kw">const </span>N: usize&gt; Zeroable <span class="kw">for </span>core::simd::Simd&lt;T, N&gt;
<span class="kw">where
</span>T: core::simd::SimdElement + Zeroable,
core::simd::LaneCount&lt;N&gt;: core::simd::SupportedLaneCount,
{
}
<span class="attribute">#[cfg(all(target_arch = <span class="string">&quot;x86&quot;</span>, feature = <span class="string">&quot;nightly_stdsimd&quot;</span>))]
</span><span class="macro">impl_unsafe_marker_for_simd!</span>(
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>x86::{
__m128bh, __m256bh, __m512,
__m512bh, __m512d, __m512i,
}
);
<span class="attribute">#[cfg(all(target_arch = <span class="string">&quot;x86_64&quot;</span>, feature = <span class="string">&quot;nightly_stdsimd&quot;</span>))]
</span><span class="macro">impl_unsafe_marker_for_simd!</span>(
<span class="kw">unsafe impl </span>Zeroable <span class="kw">for </span>x86_64::{
__m128bh, __m256bh, __m512,
__m512bh, __m512d, __m512i,
}
);
</code></pre></div>
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