python wrapper

python/src/ArrayBridge.cs

@@ -0,0 +1,13 @@
+using System.Runtime.CompilerServices;
+
+namespace QuanTAlib.Python;
+
+internal static class ArrayBridge
+{
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static unsafe bool IsNull(double* ptr) => ptr == null;
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static int ValidateLength(int n) =>
+        n > 0 ? StatusCodes.QTL_OK : StatusCodes.QTL_ERR_INVALID_LENGTH;
+}

python/src/StatusCodes.cs

@@ -0,0 +1,10 @@
+namespace QuanTAlib.Python;
+
+internal static class StatusCodes
+{
+    public const int QTL_OK = 0;
+    public const int QTL_ERR_NULL_PTR = 1;
+    public const int QTL_ERR_INVALID_LENGTH = 2;
+    public const int QTL_ERR_INVALID_PARAM = 3;
+    public const int QTL_ERR_INTERNAL = 4;
+}