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<h1 class='fqn'><span class='in-band'>Function <a href='../index.html'>std</a>::<wbr><a href='index.html'>intrinsics</a>::<wbr><a class="fn" href=''>atomic_xsub_acq</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version '></span><span id='render-detail'>
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<pre class='rust fn'>pub unsafe extern "rust-intrinsic" fn atomic_xsub_acq<T>(<br> dst: <a class="primitive" href="../primitive.pointer.html">*mut T</a>, <br> src: T<br>) -> T</pre><div class='stability'><div class='stab unstable'><details><summary><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>core_intrinsics</code>)</summary><p>intrinsics are unlikely to ever be stabilized, instead they should be used through stabilized interfaces in the rest of the standard library</p>
</details></div></div><div class='docblock'><p>Subtract from the current value, returning the previous value.
The stabilized version of this intrinsic is available on the
<code>std::sync::atomic</code> types via the <code>fetch_sub</code> method by passing
<a href="../../std/sync/atomic/enum.Ordering.html"><code>Ordering::Acquire</code></a>
as the <code>order</code>. For example,
<a href="../../std/sync/atomic/struct.AtomicIsize.html#method.fetch_sub"><code>AtomicIsize::fetch_sub</code></a>.</p>
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