Codechange: Use std::unique_ptr for link graph schedule handlers. (#12988)

This removes manual memory management.

src/linkgraph/linkgraphschedule.cpp

@@ -143,12 +143,12 @@ void LinkGraphSchedule::ShiftDates(TimerGameEconomy::Date interval)
  */
 LinkGraphSchedule::LinkGraphSchedule()
 {
-	this->handlers[0] = new InitHandler;
+	this->handlers[0] = std::make_unique<InitHandler>();
-	this->handlers[1] = new DemandHandler;
+	this->handlers[1] = std::make_unique<DemandHandler>();
-	this->handlers[2] = new MCFHandler<MCF1stPass>;
+	this->handlers[2] = std::make_unique<MCFHandler<MCF1stPass>>();
-	this->handlers[3] = new FlowMapper(false);
+	this->handlers[3] = std::make_unique<FlowMapper>(false);
-	this->handlers[4] = new MCFHandler<MCF2ndPass>;
+	this->handlers[4] = std::make_unique<MCFHandler<MCF2ndPass>>();
-	this->handlers[5] = new FlowMapper(true);
+	this->handlers[5] = std::make_unique<FlowMapper>(true);
 }
 
 /**
@@ -157,9 +157,6 @@ LinkGraphSchedule::LinkGraphSchedule()
 LinkGraphSchedule::~LinkGraphSchedule()
 {
 	this->Clear();
-	for (const auto &handler : this->handlers) {
-		delete handler;
-	}
 }
 
 /**

src/linkgraph/linkgraphschedule.h

@@ -42,7 +42,7 @@ private:
 	friend SaveLoadTable GetLinkGraphScheduleDesc();
 
 protected:
-	ComponentHandler *handlers[6]; ///< Handlers to be run for each job.
+	std::array<std::unique_ptr<ComponentHandler>, 6> handlers{}; ///< Handlers to be run for each job.
 	GraphList schedule;            ///< Queue for new jobs.
 	JobList running;               ///< Currently running jobs.