diff --git a/cxx/mcc_mount_pec.h b/cxx/mcc_mount_pec.h
new file mode 100644
index 0000000..2dcb442
--- /dev/null
+++ b/cxx/mcc_mount_pec.h
@@ -0,0 +1,32 @@
+#pragma once
+
+#include "mcc_mount_coord.h"
+
+namespace mcc
+{
+
+class MccMountPEC
+{
+public:
+    struct pec_result_t {
+        MccAngle dx, dy;
+    };
+
+    template <std::derived_from<MccAngle> XT, std::derived_from<MccAngle> YT>
+    pec_result_t compute(const XT& x, const YT& y)
+    {
+        static constexpr MccCoordPairKind coord_kind = traits::mcc_type_pair_hash<XT, YT>();
+
+        pec_result_t res;
+
+        if constexpr (coord_kind == MccCoordPairKind::COORDS_KIND_HADEC_APP) {
+        } else if constexpr (coord_kind == MccCoordPairKind::COORDS_KIND_AZALT) {
+        } else {
+            static_assert(false, "UNSUPPORTED");
+        }
+
+        return res;
+    }
+};
+
+}  // namespace mcc