1 files changed, 5 insertions, 0 deletions
diff --git a/lib/measurement.h b/lib/measurement.h
index eaa260b..46c034f 100644
--- a/lib/measurement.h
+++ b/lib/measurement.h
@@ -24,6 +24,11 @@ typedef struct {
   double O2;
 } autocorr_t;
 
+typedef struct {
+  void (*f)(state_finite_t *, void *);
+  void *data;
+} measurement_t;
+
 void meas_update(meas_t *m, double x);
 
 double meas_dx(const meas_t *m);