Add the drifting and activity checks to the subset_naive interaction function

src/runner_doiact.h

@@ -459,9 +459,7 @@ void DOPAIR_SUBSET_NAIVE(struct runner *r, struct cell *restrict ci,
                          struct part *restrict parts_i, int *restrict ind,
                          int count, struct cell *restrict cj) {
 
-  struct engine *e = r->e;
-
-// error("Don't use in actual runs ! Slow code !");
+  const struct engine *e = r->e;
 
 #ifdef WITH_OLD_VECTORIZATION
   int icount = 0;
@@ -496,6 +494,12 @@ void DOPAIR_SUBSET_NAIVE(struct runner *r, struct cell *restrict ci,
     const float hi = pi->h;
     const float hig2 = hi * hi * kernel_gamma2;
 
+#ifdef SWIFT_DEBUG_CHECKS
+    if (!part_is_active(pi, e))
+      error("Trying to correct smoothing length of inactive particle !");
+
+#endif
+
     /* Loop over the parts in cj. */
     for (int pjd = 0; pjd < count_j; pjd++) {
 
@@ -510,6 +514,14 @@ void DOPAIR_SUBSET_NAIVE(struct runner *r, struct cell *restrict ci,
         r2 += dx[k] * dx[k];
       }
 
+#ifdef SWIFT_DEBUG_CHECKS
+      /* Check that particles have been drifted to the current time */
+      if (pi->ti_drift != e->ti_current)
+        error("Particle pi not drifted to current time");
+      if (pj->ti_drift != e->ti_current)
+        error("Particle pj not drifted to current time");
+#endif
+
       /* Hit or miss? */
       if (r2 < hig2) {