#include #include class Vorm { protected: int hoog, breed; char symb; virtual void print(std::ostream& out) const {//Print rectangle for (int i = 0; i < this->hoog; ++i) { for (int j = 0; j < this->breed; ++j) out << this->symb; out << std::endl; } } public: Vorm(int h, int b, char sy) : hoog(h), breed(b), symb(sy) {//Constructor std::cout << "Constructor called: " << symb << "\n"; } virtual ~Vorm() {//Destructor std::cout << "Destructor called: " << symb << "\n"; }; friend std::ostream& operator<<(std::ostream& o, const Vorm& b); }; inline std::ostream& operator<<(std::ostream& o, const Vorm& b) { b.print(o); return o; } class Driehoek : public Vorm { public: using Vorm::Vorm; //Use base class constructor/destructor protected: virtual void print(std::ostream& out) const {//Print isosceles triangle for (int i = 0; i < this->hoog; ++i) { for (int j = 0; j <= ((float)i * this->breed / this->hoog); ++j) out << this->symb; out << std::endl; } } }; class Perspec : public Vorm { public: using Vorm::Vorm; //Use base class constructor/destructor protected: virtual void print(std::ostream& out) const {//Print triangle for (int i = this->hoog; i > 0; --i) { for (int k = 0; k <= this->breed / 2 + i; ++k) out << ' '; for (int j = 0; j <= i; ++j) out << this->symb; out << std::endl; } } }; class Ruit : public Vorm { public: using Vorm::Vorm; //Use base class constructor/destructor protected: virtual void print(std::ostream& out) const {//Print rhombus for (int i = 0; i < this->hoog / 2; ++i) { for (int j = 0; j < this->breed / 2 - i * (float)this->breed / this->hoog; ++j) out << ' '; for (int j = 0; j <= i * (float)this->breed / this->hoog * 2; ++j) out << this->symb; out << std::endl; } for (int i = this->hoog / 2; i >= 0 / 2; i--) { for (int j = this->breed / 2 - i * (float)this->breed / this->hoog; j > 0; --j) out << ' '; for (int j = 0; j <= i * (float)this->breed / this->hoog * 2; ++j) out << this->symb; out << std::endl; } } }; template class S, class T> void printcont(S const &a); template class S, class T> void delet(S const& a); int main() { std::vector kaas = { new Ruit(10,10,'+'), new Perspec(15,15,'<'), new Driehoek(10,10,'\\'), new Vorm(30,50,'😃') }; printcont(kaas); delet(kaas); } template class S, class T> void printcont(S const &a) { typename S::const_iterator itr; if constexpr (std::is_pointer::value) { for (itr = a.cbegin(); itr != a.cend(); ++itr) std::cout << **itr << '\n'; } else { for (itr = a.cbegin(); itr != a.cend(); ++itr) std::cout << *itr << '\n'; } } template class S, class T> void delet(S const& a) { typename S::const_iterator itr; if constexpr (std::is_pointer::value) { for (itr = a.cbegin(); itr != a.cend(); ++itr) delete* itr; } else { for (itr = a.cbegin(); itr != a.cend(); ++itr) delete itr; } }

Object slicing