Updated the SegmentedPool to allow for zeroing of allocations and for returning a pointer to allocated memory to allow for use in unsafe structs

UnmangedMMU/Allocators/IUnmanagedAllocator.cs

@@ -1,9 +1,11 @@
-namespace UnmanagedMMU.Allocators
+using System.Runtime.InteropServices;
+
+namespace UnmanagedMMU.Allocators
 {
     /// <summary>
     /// Interface that defines an Unmanaged allocator
     /// </summary>
-    internal unsafe interface IUnmanagedAllocator
+    public unsafe interface IUnmanagedAllocator
     {
         /// <summary>
         /// Allocates an unmanaged memory block of the specified size.
@@ -14,10 +16,28 @@
         /// </returns>
         void* Alloc(nuint size);
 
+        /// <summary>
+        /// Allocates an unmanaged memory block of the specified size with the requested alignment
+        /// </summary>
+        /// <param name="size">The number of bytes to allocate.</param>
+        /// <param name="alignment">The alignment, in bytes, of the block to allocate. This must be a power of <c>2</c></param>
+        /// <returns></returns>
+        void* AllocAligned(nuint size, nuint alignment);
+
+
         /// <summary>
         /// Frees a previously allocated unmanaged memory block.
         /// </summary>
         /// <param name="ptr">A pointer to the beginning of the memory block to free.</param>
+        /// <remarks>This method should only be called on with pointers allocated with <see cref="Alloc"/>.</remarks>
         void Free(void* ptr);
+
+        /// <summary>
+        /// Frees a previously allocated unmanaged aligned memory block
+        /// </summary>
+        /// <param name="ptr">A pointer to the beginning of the memory block to free.</param>
+        /// <param name="alignment">The alignment that the memory refered to by <paramref name="ptr"/> was aligned at (This parameter can be ignored if the underlying allocator does not need it)</param>
+        /// <remarks>This method should only be called on with pointers allocated with <see cref="AllocAligned"/>.</remarks>
+        void FreeAligned(void* ptr, nuint alignment = 0);
     }
 }