What are dynamic constructors and how do we use dynamic constructors in C++ to concatenate two strings?
I've not heard the term Dynamic Constructor used, but I'll take a guess that it's equivalent to the so-called "virtual constructor" or "clone method". Basically, it's a way of constructing an object based on the run-time type of some existing object. It basically uses standard virtual functions/polymorphism. class base { public: virtual base* create() = 0; virtual base* clone() = 0; protected: base(); base(const base&); }; virtual der1 : public base { public: base* create() { return new der1; } base* clone() { return new der1(*this); } // etc... }; virtual der2 : public base { public: base* create() { return new der2; } base* clone() { return new der2(*this); } // etc... }; int main() { base* b = new der1; base* b1 = b->create(); base* b2 = b->clone(); } In the above, if I change the initialisation of b so that it points to a der2, then b1 and b2 will also point to a der2 object (a brand new one in the case of b1, and a copy of *b in the case of b2).
