From e95dea6e3fb90a13f2009f695cfdcd308ab6ccaa Mon Sep 17 00:00:00 2001
From: Alexander Novotny <alexander_novo@mail.tmcc.edu>
Date: Tue, 18 Feb 2025 10:00:31 -0500
Subject: [PATCH] Add missing forward declaration

Fixes #57
---
 src/Model/PowerFlow/Branch/Branch.hpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/Model/PowerFlow/Branch/Branch.hpp b/src/Model/PowerFlow/Branch/Branch.hpp
index 022fc1df..5a8309c0 100644
--- a/src/Model/PowerFlow/Branch/Branch.hpp
+++ b/src/Model/PowerFlow/Branch/Branch.hpp
@@ -62,9 +62,15 @@
 
 #include <ModelEvaluatorImpl.hpp>
 
+// Forward declarations.
 namespace GridKit
 {
     template <class ScalarT, typename IdxT> class BaseBus;
+
+    namespace PowerSystemData {
+        template <class ScalarT, typename IdxT>
+        struct BranchData;
+    }
 }
 
 namespace GridKit