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Close| ptr | A pointer to the first element of the array. Ensure that this pointer is valid and points to allocated memory. |
| index | The zero-based index of the element to reference. Verify that the index is within the bounds of the array to prevent access violations. |
T A reference to the value of type T at the specified index within the array. This reference allows direct manipulation of the value at its memory location.
Obtains a reference to a value of type T in an array at a specified index in memory.
The ArrayElementAsRef method allows direct access to an array element by its index in memory. This method provides a reference to the element, enabling efficient data manipulation without copying. Use this method with care, as incorrect pointer usage can cause memory corruption or application crashes.
using UnityEngine; using Unity.Collections.LowLevel.Unsafe; using System.Runtime.InteropServices;
public class ArrayElementAsRefExample : MonoBehaviour { [StructLayout(LayoutKind.Sequential)] struct CustomStruct { public int Id; public float Value; }
void Start() { int arrayLength = 5;
// Allocate a buffer for CustomStruct using stackalloc unsafe { CustomStruct* structArray = stackalloc CustomStruct[arrayLength];
// Initialize the array with values for (int i = 0; i < arrayLength; i++) { structArray[i].Id = i; structArray[i].Value = i * 1.5f; }
// Get a reference to an element using ArrayElementAsRef ref CustomStruct element = ref UnsafeUtility.ArrayElementAsRef<CustomStruct>(structArray, 2); element.Value = 99.9f; // Modify the value in place
// Output the modified value Debug.Log($"Modified element at index 2: Id = {structArray[2].Id}, Value = {structArray[2].Value}"); } } }
Additional resources: UnsafeUtility.ReadArrayElement, UnsafeUtility.WriteArrayElement.
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