From 30f8c0653f56b2202e9105ba3071dd168b16ae34 Mon Sep 17 00:00:00 2001
From: Florian Deconinck <deconinck.florian@gmail.com>
Date: Mon, 22 Apr 2024 14:36:26 -0400
Subject: [PATCH] Add magic number

---
 src/tcn/py_ftn_interface/example/bridge.f90             | 5 +++--
 src/tcn/py_ftn_interface/example/data_desc.py           | 2 ++
 src/tcn/py_ftn_interface/example/data_to_be_transited.h | 2 ++
 src/tcn/py_ftn_interface/example/runtime_code.py        | 4 ++++
 4 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/tcn/py_ftn_interface/example/bridge.f90 b/src/tcn/py_ftn_interface/example/bridge.f90
index ffe546b..23e7f12 100644
--- a/src/tcn/py_ftn_interface/example/bridge.f90
+++ b/src/tcn/py_ftn_interface/example/bridge.f90
@@ -11,6 +11,9 @@ module stub_interface_mod
       real(c_float) :: x
       integer(c_int) :: y
       logical(c_bool) :: b
+      ! Magic number: help guaranteeing layout is kept
+      ! consistant through the interface. Imperfect.
+      integer(c_int) :: i_am_123456789 = 123456789
    end type
 
    interface
@@ -27,5 +30,3 @@ end subroutine python_function_f
    end interface
 
 end module stub_interface_mod
-
-
diff --git a/src/tcn/py_ftn_interface/example/data_desc.py b/src/tcn/py_ftn_interface/example/data_desc.py
index d326d9b..70454fa 100644
--- a/src/tcn/py_ftn_interface/example/data_desc.py
+++ b/src/tcn/py_ftn_interface/example/data_desc.py
@@ -6,3 +6,5 @@ class Data_py_t:
     x: float
     y: int
     b: bool
+    # Magic number: see Fortran
+    i_am_123456789: int
diff --git a/src/tcn/py_ftn_interface/example/data_to_be_transited.h b/src/tcn/py_ftn_interface/example/data_to_be_transited.h
index e155a12..b616411 100644
--- a/src/tcn/py_ftn_interface/example/data_to_be_transited.h
+++ b/src/tcn/py_ftn_interface/example/data_to_be_transited.h
@@ -6,6 +6,8 @@ typedef struct
     float x;
     int y;
     bool b;
+    // Magic number, see Fortran
+    int i_am_123456789;
 } data_t;
 
 typedef union
diff --git a/src/tcn/py_ftn_interface/example/runtime_code.py b/src/tcn/py_ftn_interface/example/runtime_code.py
index 5c070da..a33ad3f 100644
--- a/src/tcn/py_ftn_interface/example/runtime_code.py
+++ b/src/tcn/py_ftn_interface/example/runtime_code.py
@@ -3,6 +3,10 @@
 
 
 def check_function(data: Data_py_t):
+    # Check the magic number
+    if data.i_am_123456789 != 123456789:
+        raise ValueError("Magic number failure")
+
     print(f"Data comes as {data} of type {type(data)}")
     members = inspect.getmembers(Data_py_t)
     keys = list(