一些C++class类的代码

@一些C++class类的代码

代码

//main8_class.cpp
#include <iostream>		// input/output standard library
#include <string>			// standard string library
#include <vector> 
#include <map> 

#include "Plant.h" 

using namespace std;

class CuttingFlower : public Plant
{
public:
	//Default Constructor
	CuttingFlower(){
		cerr << "\nCuttingFlower::Constructor()";
		name_ = "CuttingFlower " + randomName(10);
	}
	CuttingFlower(std::string my_name){
		cerr << "\nCuttingFlower::Constructor() with Name"<<endl;
		name_ = my_name;
	}
	//Destructor
	~CuttingFlower()
	{
		cerr << "\nCuttingFlower::Destructor()";
	}//this is a declaration and a definition

	string TypeOfVaseToUse(){
		//if
		return "LargeVase";
	}
	int MonthToCut(){
		//if
		return 7;
	}

	virtual std::string GetName() const{
		cerr << "\nCuttingFlower::GetName()"<<endl;
		return "CuttingFlower" + Plant::name_;
	}

	virtual int GetID() const{
		return Object::id_ + 90000;
	}
};

class Vegetable : public Plant
{
public:
	//Constructor
	Vegetable(){cerr << "\nVegetable::Constructor()";}
	~Vegetable()
	{
		cerr << "\nVegetable::Destructor()";
	}//this is a declaration and a definition
	virtual std::string GetName() const
	{
		cerr << "\nVegetable::GetName()"<<endl;
		return "Vegetable" + Plant::name_;
	}

	int MonthToPick()
	{
		//if
		return 7;
	}

	virtual int GetID() const{
		return Object::id_ + 70000;
	}
};

class Fruit : public Plant
{
public:
	//Constructor
	Fruit()
	{
		cerr << "\nFruit::Constructor()";
	}
	~Fruit()
	{
		cerr << "\nFruit::Destructor()";
	}//this is a declaration and a definition
};

int main()
{
	cerr << "\nMy garden"<<endl;

	Seed mini_seed;
	mini_seed.size_ = 3.e-3;

	//Vegetable carrot_;
	//carrot_.SetSeed(mini_seed);
	//Fruit melon_;
	//melon_.SetSeed(mini_seed);
	cout << "----------------------CuttingFlower dahlia_;-----------------------" << endl;
	CuttingFlower dahlia_;
	dahlia_.SetSeed(mini_seed);
	cerr << "\nName (FIRST-GetName-BASE): " << dahlia_.GetName()<<endl;
	//cerr << "\nName (FIRST-FlowerName-DERIVED): " << dahlia_.FlowerName();
	cout << "-----------------------CuttingFlower dahlia2_(Dahlia)-------------------------"<< endl;

	CuttingFlower dahlia2_("Dahlia");
	dahlia2_.SetSeed(mini_seed);
	cerr << "\nName (SECOND-GetName-BASE): " << dahlia2_.GetName()<<endl;
	//cerr << "\nName (SECOND-FlowerName-DERIVED): " << dahlia2_.FlowerName();
	
	
	{
		cout << "-----------------------CuttingFlower* dahlia_ = new CuttingFlower(Cyclamen)--------------------" << endl;
		CuttingFlower* dahlia_ = new CuttingFlower("Cyclamen");
		dahlia_->SetSeed(mini_seed);
		cerr << "\n\nName: " << dahlia_->GetName()<<endl;
		delete dahlia_;
	}

	//cerr << "------------------------\n\n";

	{
		Plant* plant = NULL;
		//asking the user what plant to create
		cout << "-----------------------plant = new CuttingFlower(Cyclamen)---------------------------------" << endl;
		plant = new CuttingFlower("Cyclamen");
		plant->SetSeed(mini_seed);
		cerr << "\n\nName: " << plant->GetName()<<endl;// << " = " << (*plant).GetName();
		delete plant;
		///
		cout << "--------------------------------plant = new vegetable-----------------------" << endl;
		plant = new Vegetable();
		plant->SetSeed(mini_seed);
		cerr << "\n\nName: " << plant->GetName()<<endl;// << " = " << (*plant).GetName();
		delete plant;
		cout << "----------------------Object* obj = new CuttingFlower(Cyclamen)------------------------------" << endl;
		Object* obj = new CuttingFlower("Cyclamen");  //父类创建的步骤
	}

	std::vector<Object*> vItems_in_the_garden;
	std::map<std::string, Object*> mItems_in_the_garden_by_name;

	//define plant 
	cout << "--------------------plant1 = new CuttingFlower(Cyclamen)-----------------------------" << endl;
	Plant* plant1 = NULL;
	plant1 = new CuttingFlower("Cyclamen");
	plant1->SetSeed(mini_seed);
	vItems_in_the_garden.push_back(plant1);
	mItems_in_the_garden_by_name.insert(make_pair(plant1->GetName(), plant1));

	cout << "----------------------plant2 = new Vegetable()------------------------------" << endl;
	Vegetable* plant2 = NULL;
	plant2 = new Vegetable();
	plant2->SetSeed(mini_seed);
	vItems_in_the_garden.push_back(plant2);
	mItems_in_the_garden_by_name.insert(make_pair(plant2->GetName(), plant2));

	cout << "--------------------plant3 = new CuttingFlower()------------------------------" << endl;
	CuttingFlower* plant3 = NULL;
	plant3 = new CuttingFlower();
	plant3->SetSeed(mini_seed);
	vItems_in_the_garden.push_back(plant3);
	mItems_in_the_garden_by_name.insert(make_pair(plant3->GetName(), plant3));

	//iterate over items in my garden and print out the name
	cout << endl;
	cout << "------------------ID----------------------" << endl;
	cerr << "\n\n\nIDs from vector:";
	for (std::vector<Object*>::const_iterator iVect = vItems_in_the_garden.begin(); iVect != vItems_in_the_garden.end(); iVect++)
		cerr << "\n" << (*iVect)->GetID();
	//cerr << "\nNames from Map:";
	//for (std::map<std::string, Object*>::const_iterator iVect = mItems_in_the_garden_by_name.begin(); iVect != mItems_in_the_garden_by_name.end(); iVect++)
	//	cerr << "\n" << (*iVect).first;
	//cerr << "\nNames from vector:";
	//for (std::vector<Object*>::const_iterator iVect = vItems_in_the_garden.begin(); iVect != vItems_in_the_garden.end(); iVect++)
	//	cerr << "\n" << dynamic_cast<Plant*>((*iVect))->GetName();//dynamically re-assigned the type of this object


	//for (std::map<std::string, Object*>::const_iterator iVect = mItems_in_the_garden_by_name.begin(); iVect != mItems_in_the_garden_by_name.end(); iVect++)
	//	cerr << "\n" << (*iVect).first; -> SAME AS...
	cout << endl;
	cout << "---------mItems_in_the_garden_by_name-----------" << endl;
	for (auto object : mItems_in_the_garden_by_name)
		cerr << "\n" << object.first;
	cout << endl;
	cout << "------vItems_in_the_garden------------" << endl;
	//for (std::vector<Object*>::const_iterator iVect = vItems_in_the_garden.begin(); iVect != vItems_in_the_garden.end(); iVect++)
	//	cerr << "\n" << dynamic_cast<Plant*>((*iVect))->GetName();//dynamically re-assigned the type of this object -> SAME AS...
	for (auto object : vItems_in_the_garden)
		cerr << "\n" << dynamic_cast<Plant*>(object)->GetName()<<endl;

	cout << endl;
	cout << "--------------Delete------------" << endl;
	delete plant1;
	delete plant2;
	delete plant3;

	cin.get();
	return 0;
}

下面是Plant.h

//Plant.h
#ifndef PLANT_H
#define PLANT_H

#include <iostream>		// input/output standard library
#include <string>			// standard string library
#include <vector>

//dont include using namespace commands in header files because it leads to inconsistent interpretation of the naming of the classes

//simple class
enum Colour { Yellow, Red, Blue, White, Pink, Green };//Instances

std::string randomName(int len);//declaration

//Essentially the same as a class; but by default PUBLIC
struct Seed
{
	double size_;
};

class Object //Abstract Class
{
public:
	Object(int random_id) { id_ = random_id; }

	virtual int GetID() const = 0; //@[email protected] virtual function (=0)

protected:
	int id_;
};

//Declaration of the class "Plant", everything in a class is by default PRIVATE
//Base Class
class Plant : public Object
{
public:
	Plant();
	~Plant();

	//Get Name
	virtual std::string GetName() const;

	//Member functions
	//Accessor for the seed
	//Seed GetSeed() const { return seed_; }//making a copy
	const Seed& GetSeed() const;

	//Mutator for the seed
	void SetSeed(const Seed& s);

	//Accessor/Mutator
	Seed& MySeed();

	virtual int GetID() const { return -1; }

private:
	//Members
	Seed seed_;

protected:
	std::string name_;
};

#endif

下面是Plant.cpp

//Plant.cpp
#include "Plant.h" 

using namespace std;

//This file contains the definitions of our functions
std::string randomName(int len)
{
	string a = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
	string r;
	for (int i = 0; i < len; i++) r.push_back(a.at(size_t(rand() % 62)));
	return r;
}

Plant::Plant() : Object(rand() % 1000)
{
	name_ = randomName(10);
	cerr << "\nPlant::Constructor() with auto name --> " << name_;

}//this is a declaration and a definition

Plant::~Plant()
{
	cerr << "\nPlant::Destructor()"<<endl;
}//this is a declaration and a definition

std::string Plant::GetName() const
{
	cerr << "\nPlant::GetName()";
	return "Plant" + name_;
}

//Member functions
//Accessor for the seed
//Seed GetSeed() const { return seed_; }//making a copy
const Seed& Plant::GetSeed() const
{
	return seed_;
}//NOT making a copy

//Mutator for the seed
void Plant::SetSeed(const Seed& s)
{
	seed_ = s;
}

//Accessor/Mutator
Seed& Plant::MySeed()
{
	return seed_;
}