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CS 225Data Structures
Sept. 17 – Templates and Linked MemoryWade Fagen-Ulmschneider
class AnimalShelter {
public:
Animal & adopt();
// ...
};
animalShelter.cpp5
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class Animal {
public:
void speak() { }
};
class Dog : public Animal {
public:
void speak() { }
};
class Cat : public Animal {
public:
void speak() { }
};
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Abstract Class:[Requirement]:
[Syntax]:
[As a result]:
class PNG {
public:
PNG();
PNG(unsigned int width, unsigned int height);
PNG(PNG const & other);
~PNG();
PNG & operator= (PNG const & other);
bool operator== (PNG const & other) const;
bool readFromFile(string const & fileName);
bool writeToFile(string const & fileName);
HSLAPixel & getPixel(unsigned int x, unsigned int y) const;
unsigned int width() const;
// ...
private:
unsigned int width_;
unsigned int height_;
HSLAPixel *imageData_;
void _copy(PNG const & other);
};
MP2: cs225/PNG.h18
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class Cube {
public:
~Cube() { std::cout << "~Cube() invoked."
<< std::endl; }
};
class RubikCube : public Cube {
public:
~RubikCube() { std::cout << "~RubikCube() invoked."
<< std::endl; }
};
virtual-dtor.cpp4
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std::cout << "Non-virtual dtor:" << std::endl;
Cube *ptr = new RubikCube();
delete ptr;
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class CubeV {
public:
virtual ~CubeV() { std::cout << "~CubeV() invoked."
<< std::endl; }
};
class RubikCubeV : public CubeV {
public:
~RubikCubeV() { std::cout << "~RubikCubeV() invoked."
<< std::endl; }
};
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std::cout << "Virtual dtor:" << std::endl;
CubeV *ptrV = new RubikCubeV();
delete ptrV;
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Mattox Monday
Abstract Data Type
List ADT
What types of “stuff” do we want in our list?
Templates
T maximum(T a, T b) {
T result;
result = (a > b) ? a : b;
return result;
}
template1.cpp1
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#pragma once
class List {
public:
private:
};
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List.cpp12
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List Implementations1.
2.
Linked Memory
C S 2 2 5Ø
class ListNode {
T & data;
ListNode * next;
ListNode(T & data) : data(data), next(NULL) { }
};
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Linked Memory
2 2 5Ø
Linked Memory
C SØ
2 2 5Ø
#pragma once
template <class T>
class List {
public:
/* ... */
private:
class ListNode {
T & data;
ListNode * next;
ListNode(T & data) :
data(data), next(NULL) { }
};
};
List.h12
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#include "List.h"
template <class T>
void List<T>::insertAtFront(const T& t) {
}
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Running Time of Linked List insertAtFront
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void List<T>::printReverse()
const {
}
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Linked Memory
C S 2 2 5Ø
head
Running Time of Linked List printReverse
template <typename T>
T List<T>::operator[](unsigned index) {
}
List.cpp24
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ListNode *& List<T>::_index(int index) const {
}
List.cpp33
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