policy-based-design – Tarik Billa

Policy based design and best practices – C++

August 31, 2023 by Tarik

Here’s how I would implement the class: template<class PenType> class Writer { public: Writer(const PenType& pen = PenType()) : pen(pen) {} void StartWriting() { pen.Write(); } private: PenType pen; }; This allows the user to pass a specific Pen object to the constructor, if it either doesn’t have a default constructor, or you don’t want … Read more

What is the difference between a trait and a policy?

March 23, 2023 by Tarik

Policies Policies are classes (or class templates) to inject behavior into a parent class, typically through inheritance. Through decomposing a parent interface into orthogonal (independent) dimensions, policy classes form the building blocks of more complex interfaces. An often seen pattern is to supply policies as user-definable template (or template-template) parameters with a library-supplied default. An … Read more