Add project files.

Assets/Cryville/Common/Buffers/ObjectPool.cs

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+namespace Cryville.Common.Buffers {
+	/// <summary>
+	/// A resource pool that allows reusing instances of type <typeparamref name="T" />.
+	/// </summary>
+	/// <typeparam name="T">The type of the objects in the pool.</typeparam>
+	public abstract class ObjectPool<T> where T : class {
+		int _index;
+		readonly T[] _objs;
+		/// <summary>
+		/// Creates an instance of the <see cref="ObjectPool{T}" /> class.
+		/// </summary>
+		/// <param name="capacity">The capacity of the pool.</param>
+		public ObjectPool(int capacity) {
+			_objs = new T[capacity];
+		}
+		/// <summary>
+		/// Rents a object from the pool.
+		/// </summary>
+		/// <returns>The rented object.</returns>
+		public T Rent() {
+			T obj = null;
+			if (_index < _objs.Length) {
+				obj = _objs[_index];
+				_objs[_index++] = null;
+			}
+			if (obj == null) obj = Construct();
+			return obj;
+		}
+		/// <summary>
+		/// Returns a rented object to the pool.
+		/// </summary>
+		/// <param name="obj">The object to return.</param>
+		public void Return(T obj) {
+			if (_index > 0) _objs[--_index] = obj;
+		}
+		/// <summary>
+		/// Constructs a new instance of type <typeparamref name="T" />.
+		/// </summary>
+		/// <returns>The new instance.</returns>
+		protected abstract T Construct();
+	}
+}