Code cleanup.

Assets/Cryville/Common/Pdt/PdtOperator.cs

@@ -11,7 +11,7 @@ namespace Cryville.Common.Pdt {
 		/// <summary>
 		/// The count of the operands loaded.
 		/// </summary>
-		protected int LoadedOperandCount { get { return ParamCount - _loadindex; } }
+		protected int LoadedOperandCount { get { return _pc - _loadindex; } }
 		/// <summary>
 		/// Gets the operand at the specified index.
 		/// </summary>
@@ -24,20 +24,20 @@ namespace Cryville.Common.Pdt {
 			int i = index + _loadindex;
 			return _operands[i];
 		}
-		internal int ParamCount { get; private set; }
+		readonly int _pc;
 		/// <summary>
 		/// Creates an instance of the <see cref="PdtOperator" /> class.
 		/// </summary>
 		/// <param name="pc">The suggested parameter count.</param>
 		protected PdtOperator(int pc) {
-			ParamCount = pc;
+			_pc = pc;
 			_operands = new PdtVariableMemory[pc];
 		}
 		PdtEvaluatorBase _etor;
 		bool _rfreq = true;
 		internal void Begin(PdtEvaluatorBase etor) {
 			_etor = etor;
-			_loadindex = ParamCount;
+			_loadindex = _pc;
 		}
 		internal void LoadOperand(PdtVariableMemory mem) {
 			if (_loadindex == 0) return;
@@ -55,6 +55,9 @@ namespace Cryville.Common.Pdt {
 		/// <summary>
 		/// Executes the operator.
 		/// </summary>
+		/// <remarks>
+		/// <para>When overridden, this method reads operands by calling <see cref="GetOperand(int)" />, and writes the result to the frame obtained by calling <see cref="GetReturnFrame(int, int)" />.</para>
+		/// </remarks>
 		protected abstract void Execute();
 		/// <summary>
 		/// Gets a return frame.