Update aligned allocator definition for C++20 compiler supports (#438)

* Add potentially missing definitions to allocator

* Resinstate brew installed clang builder tests

* Update CI alloc name

* Auto update version

* Update setup

* Update

* Auto update version

* Auto update version

* Trigger CI

* Remove extraneous CI file

* Remove optional allocator types

* Auto update version

* Trigger CI

* Update changelog

---------

Co-authored-by: Dev version update bot <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Chae-Yeun Park <[email protected]>

Author: 3 people

.github/CHANGELOG.md

@@ -19,14 +19,17 @@
 
 ### Bug fixes
 
+* Ensure aligned allocator definition works with C++20 compilers.
+  [(#438)](https://github.com/PennyLaneAI/pennylane-lightning/pull/438)
+
 * Prevent multiple threads from calling `Kokkos::initialize` or `Kokkos::finalize`.
-  [(#439)] (https://github.com/PennyLaneAI/pennylane-lightning/pull/439)
+  [(#439)](https://github.com/PennyLaneAI/pennylane-lightning/pull/439)
 
 ### Contributors
 
 This release contains contributions from (in alphabetical order):
 
-Lee J. O'Riordan
+Lee J. O'Riordan, Chae-Yeun Park
 
 ---
 

pennylane_lightning/_version.py

@@ -17,4 +17,4 @@
 """
 
 
-__version__ = "0.31.0-dev3"
+__version__ = "0.31.0-dev4"

pennylane_lightning/src/simulator/Observables.hpp

@@ -312,7 +312,7 @@ template <class T> struct HamiltonianApplyInPlace<T, true> {
                     const std::vector<std::shared_ptr<Observable<T>>> &terms,
                     StateVectorManagedCPU<T> &sv) {
         const size_t length = sv.getLength();
-        const auto allocator = sv.allocator();
+        auto allocator = sv.allocator();
 
         std::vector<std::complex<T>, decltype(allocator)> sum(
             length, std::complex<T>{}, allocator);

pennylane_lightning/src/util/Memory.hpp

@@ -100,8 +100,6 @@ template <class T> class AlignedAllocator {
      */
     [[nodiscard]] inline uint32_t alignment() const { return alignment_; }
 
-    template <class U> struct rebind { using other = AlignedAllocator<U>; };
-
     template <typename U>
     explicit constexpr AlignedAllocator(
         [[maybe_unused]] const AlignedAllocator<U> &rhs) noexcept