From e97b90ffd45594a1756d5fab4c39fc5d72fa4253 Mon Sep 17 00:00:00 2001
From: D <djp42@stanford.edu>
Date: Wed, 13 Mar 2019 11:19:19 -0700
Subject: [PATCH] more findfirst fixes

---
 src/1d/vehicles.jl                           | 6 +++---
 src/2d/behaviors/lane_change_models/MOBIL.jl | 6 +++---
 src/2d/vehicles/scenes.jl                    | 4 ++--
 3 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/src/1d/vehicles.jl b/src/1d/vehicles.jl
index 6e0dd05..fc5f119 100644
--- a/src/1d/vehicles.jl
+++ b/src/1d/vehicles.jl
@@ -13,7 +13,7 @@ function get_headway(veh_rear::Vehicle1D, veh_fore::Vehicle1D, roadway::Straight
 end
 function get_neighbor_fore(scene::Scene1D, vehicle_index::Int, roadway::StraightRoadway)
     ego = scene[vehicle_index]
-    best_ind = 0
+    best_ind = nothing
     best_gap = Inf
     for (i,veh) in enumerate(scene)
         if i != vehicle_index
@@ -27,7 +27,7 @@ function get_neighbor_fore(scene::Scene1D, vehicle_index::Int, roadway::Straight
 end
 function get_neighbor_rear(scene::Scene1D, vehicle_index::Int, roadway::StraightRoadway)
     ego = scene[vehicle_index]
-    best_ind = 0
+    best_ind = nothing
     best_gap = Inf
     for (i,veh) in enumerate(scene)
         if i != vehicle_index
@@ -38,4 +38,4 @@ function get_neighbor_rear(scene::Scene1D, vehicle_index::Int, roadway::Straight
         end
     end
     return NeighborLongitudinalResult(best_ind, best_gap)
-end
\ No newline at end of file
+end
diff --git a/src/2d/behaviors/lane_change_models/MOBIL.jl b/src/2d/behaviors/lane_change_models/MOBIL.jl
index 7be854f..65ac7c0 100644
--- a/src/2d/behaviors/lane_change_models/MOBIL.jl
+++ b/src/2d/behaviors/lane_change_models/MOBIL.jl
@@ -121,7 +121,7 @@ function observe!(model::MOBIL, scene::Scene, roadway::Roadway, egoid::Int)
 
         Δaccel_n = 0.0
         passes_safety_criterion = true
-        if rear_L.ind != 0
+        if rear_L.ind != nothing
             id = scene[rear_L.ind].id
             accel_n_orig = rand(observe!(reset_hidden_state!(model.mlon), scene, roadway, id)).a
             veh_ego = Entity(veh_ego, egostate_L)
@@ -139,7 +139,7 @@ function observe!(model::MOBIL, scene::Scene, roadway::Roadway, egoid::Int)
 
 
             Δaccel_o = 0.0
-            if rear_M.ind != 0
+            if rear_M.ind != nothing
                 id = scene[rear_M.ind].id
                 accel_o_orig = rand(observe!(reset_hidden_state!(model.mlon), scene, roadway, id)).a
                 veh_ego = Entity(veh_ego, egostate_L)
@@ -163,4 +163,4 @@ function observe!(model::MOBIL, scene::Scene, roadway::Roadway, egoid::Int)
 
     model
 end
-Base.rand(model::MOBIL) = LaneChangeChoice(model.dir)
\ No newline at end of file
+Base.rand(model::MOBIL) = LaneChangeChoice(model.dir)
diff --git a/src/2d/vehicles/scenes.jl b/src/2d/vehicles/scenes.jl
index 2e86c96..c99599a 100644
--- a/src/2d/vehicles/scenes.jl
+++ b/src/2d/vehicles/scenes.jl
@@ -228,7 +228,7 @@ function get_neighbor_rear_along_lane(
     index_to_ignore::Int=-1,
     ) where {S<:VehicleState,D<:Union{VehicleDef, BicycleModel},I}
 
-    best_ind = 0
+    best_ind = nothing
     best_dist = max_distance_rear
     tag_target = tag_start
 
@@ -277,7 +277,7 @@ function get_neighbor_rear_along_lane(
             end
         end
 
-        if best_ind != 0
+        if best_ind != nothing
             break
         end