Fix -Wdeprecated-copy and -Wclass-memaccess warnings on GCC 9

src/saveload/afterload.cpp

@@ -2704,11 +2704,14 @@ bool AfterLoadGame()
 			/* yearly_expenses has 3*15 entries now, saveload code gave us 3*13.
 			 * Move the old data to the right place in the new array and clear the new data.
 			 * The move has to be done in reverse order (first 2, then 1). */
-			MemMoveT(&c->yearly_expenses[2][0], &c->yearly_expenses[1][11], 13);
-			MemMoveT(&c->yearly_expenses[1][0], &c->yearly_expenses[0][13], 13);
+			// MemMoveT(&c->yearly_expenses[2][0], &c->yearly_expenses[1][11], 13);
+			// MemMoveT(&c->yearly_expenses[1][0], &c->yearly_expenses[0][13], 13);
+			// The below are equivalent to the MemMoveT calls above
+			std::copy_backward(&c->yearly_expenses[1][11], &c->yearly_expenses[1][11] + 13, &c->yearly_expenses[2][0] + 13);
+			std::copy_backward(&c->yearly_expenses[0][13], &c->yearly_expenses[0][13] + 13, &c->yearly_expenses[1][0] + 13);
 			/* Clear the old location of just-moved data, so sharing income/expenses is set to 0 */
-			MemSetT(&c->yearly_expenses[0][13], 0, 2);
-			MemSetT(&c->yearly_expenses[1][13], 0, 2);
+			std::fill_n(&c->yearly_expenses[0][13], 2, 0);
+			std::fill_n(&c->yearly_expenses[1][13], 2, 0);
 		}
 	}
 

src/station_base.h

@@ -358,6 +358,8 @@ public:
 	FlowStatMapIterator(const FlowStatMapIterator<FlowStat, FlowStatMap, btree::btree_map<StationID, uint16>::iterator> &other) :
 		fsm(other.fsm), current(other.current) {}
 
+	FlowStatMapIterator &operator=(const FlowStatMapIterator &) = default;
+
 	reference operator*() const { return this->fsm->flows_storage[this->current->second]; }
 	pointer operator->() const { return &(this->fsm->flows_storage[this->current->second]); }
 

src/zoning_cmd.cpp

@@ -194,8 +194,7 @@ SpriteID TileZoneCheckUnservedBuildingsEvaluation(TileIndex tile, Owner owner)
 	}
 
 	CargoArray dat;
-
-	memset(&dat, 0, sizeof(dat));
+	dat.Clear();
 	AddAcceptedCargo(tile, dat, nullptr);
 	if (dat[CT_MAIL] + dat[CT_PASSENGERS] == 0) {
 		// nothing is accepted, so now test if cargo is produced