From 5e25d79beef19c39537b0f15982a175fec45bb3e Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sat, 11 Nov 2023 17:37:57 +0000
Subject: Refactor BufferedLocationT to use a callback

Simplifies customisation in the face of multiple fields
---
 game/vehicles/railVehicle.cpp | 15 ++++++++++++---
 game/vehicles/railVehicle.h   |  5 ++---
 2 files changed, 14 insertions(+), 6 deletions(-)

(limited to 'game')

diff --git a/game/vehicles/railVehicle.cpp b/game/vehicles/railVehicle.cpp
index fc43995..1ed904d 100644
--- a/game/vehicles/railVehicle.cpp
+++ b/game/vehicles/railVehicle.cpp
@@ -12,10 +12,19 @@
 #include <ray.h>
 
 RailVehicle::RailVehicle(RailVehicleClassPtr rvc) :
-	RailVehicleClass::Instance {rvc->instances.acquire()}, rvClass {std::move(rvc)}, location {&LV::body, *this},
+	RailVehicleClass::Instance {rvc->instances.acquire()}, rvClass {std::move(rvc)},
+	location {[this](const BufferedLocation * l) {
+		this->get()->body = l->getTransform();
+	}},
 	bogies {{
-			{&LV::front, *this, Position3D {0, rvClass->wheelBase / 2.F, 0}},
-			{&LV::back, *this, Position3D {0, -rvClass->wheelBase / 2.F, 0}},
+			{[this](const BufferedLocation * l) {
+				 this->get()->front = l->getTransform();
+			 },
+					Position3D {0, rvClass->wheelBase / 2.F, 0}},
+			{[this](const BufferedLocation * l) {
+				 this->get()->back = l->getTransform();
+			 },
+					Position3D {0, -rvClass->wheelBase / 2.F, 0}},
 	}}
 {
 }
diff --git a/game/vehicles/railVehicle.h b/game/vehicles/railVehicle.h
index e034852..20d1ea1 100644
--- a/game/vehicles/railVehicle.h
+++ b/game/vehicles/railVehicle.h
@@ -21,9 +21,8 @@ public:
 
 	RailVehicleClassPtr rvClass;
 	using LV = RailVehicleClass::LocationVertex;
-	using BLocation = BufferedLocationT<glm::mat4 LV::*, RailVehicleClass::Instance &>;
-	BLocation location;
-	std::array<BLocation, 2> bogies;
+	BufferedLocationUpdater location;
+	std::array<BufferedLocationUpdater, 2> bogies;
 };
 
 using RailVehiclePtr = std::unique_ptr<RailVehicle>;
-- 
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