[template]템플릿 예제

예제: Teach yourself C++ in 21 days/* #include <iostream> using namespace std; const int DefaultSize = 10; template <class T> class Array { public: Array(int itsSize=DefaultSize); Array(const Array &rhs); ~Array() {delete []pType;} //operator Array& operator=(const Array&); T& operator[] (int offSet){return pType[offSet];} //accessors int getSize() { return itsSize; } private: T *pType; int itsSize; }; */ #include <iostream> using namespace std; const int DefaultSize = 10; class Animal { public: Animal(int); Animal(); ~Animal(){} int GetWeight() const {return itsWeight;} void Display() const {std::cout << itsWeight; } private: int itsWeight; }; Animal::Animal(int weight): itsWeight(weight){} Animal::Animal(): itsWeight(0) {} template <class T> class Array { public: Array(int itsSize = DefaultSize); Array(const Array &rhs); ~Array() { delete [] pType; } Array& operator=(const Array&); T& operator[] (int offSet){return pType[offSet];} const T& operator[](int offSet) const { return pType[offSet];} int GetSize() const {return itsSize;} private: T *pType; int itsSize; }; template <class T> Array<T>::Array(int size): itsSize(size) { pType = new T[size]; cout << "default constructor with size : " << GetSize(); } template <class T> Array<T>::Array(const Array &rhs) { itsSize = rhs.GetSize(); pType = new T[itsSize]; for (int i=0;i<itsSize;i++) pType[i] = rhs[i]; } template <class T> Array<T>& Array<T>::operator=(const Array &rhs) { if (this == &rhs) return *this; delete [] pType; itsSize = rhs.GetSize(); pType = new T[itsSize]; for (int i = 0; i<itsSize; i++) pType[i] = rhs[i]; return *this; } int main() { Array<int> theArray; Array<Animal> theZoo; Animal *pAnimal; for(int i=0;i<theArray.GetSize();i++) { theArray[i]=i*2; pAnimal = new Animal(i*3); theZoo[i] = *pAnimal; delete pAnimal; } for(int j=0;j<theArray.GetSize();j++) { std::cout << "theArray["<<j<<"]:\t"; std::cout << theArray[j]<< "\t\t"; std::cout << "theZoo["<<j<<"]:\t"; theZoo[j].Display(); std::cout << std::endl; } return 0; }