Fix compilation errors with C++20

include/TypesafeCollection.h

@@ -48,8 +48,8 @@ class TypesafeCollection
 	}
 
 	virtual ~TypesafeCollection(){}
-	TypesafeCollection<T>(const TypesafeCollection<T>&) = delete;
-	TypesafeCollection<T>& operator=(const TypesafeCollection<T>&) = delete;
+	TypesafeCollection(const TypesafeCollection<T>&) = delete;
+	TypesafeCollection& operator=(const TypesafeCollection<T>&) = delete;
 
 	bool is_valid()
 	{

vertex_lcfi/util/inc/memorymanager.h

@@ -72,18 +72,18 @@ namespace vertex_lcfi
 	//Protect the constructor, copy and assignment to prevent usage.		
 	protected:
 		//! Do not use
-		MemoryManager<T>() {}
+		MemoryManager() = default;
 		//! Do not use
-		MemoryManager<T>(const MemoryManager<T>&) {}
+		MemoryManager(const MemoryManager<T>&) = delete;
 		//! Do not use
-		MemoryManager<T>& operator= (const MemoryManager<T>&) {return MemoryManager<T>();}
+		MemoryManager<T>& operator= (const MemoryManager<T>&) = delete;
 	private:
 		std::vector<T*> _Objects{};
 
 	};
 
 	template <class T>
-	MemoryManager<T>::~MemoryManager<T>()
+	MemoryManager<T>::~MemoryManager()
 	{
 	//Delete all in case the user hasn't done so
 	this->delAll();

vertex_lcfi/zvtop/include/maxminfinder.h

@@ -21,8 +21,8 @@ namespace ZVTOP
 		FunctionMinimiser( T* funcClass, double initialDelta, unsigned int decimalPlaces );
 		~FunctionMinimiser(){};//I doubt this will be derived from but stick it in anyway
 		std::vector<double> Minimise( const std::vector<double> & seedPoint );
-		FunctionMinimiser<T>(const FunctionMinimiser<T>&) = delete;
-		FunctionMinimiser<T>& operator=(const FunctionMinimiser<T>&) = delete;
+		FunctionMinimiser(const FunctionMinimiser<T>&) = delete;
+		FunctionMinimiser& operator=(const FunctionMinimiser<T>&) = delete;
 	protected:
 		//Method that finds a vector that 'points down hill' by examining the rate of
 		//change of the function at the point "point".