Android C++ 学习笔记 2

行稳方能走远2025-12-29 9:50

目录

17th_class_template

template.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>

using namespace std;


template<typename T>
class AAA {
private:
	T t;
public:
	void test_func(const T &t);
	void print(void);
};

template<typename T> void AAA<T>::test_func(const T &t)
{
	this->t = t;
}
template<typename T>
void AAA<T>::print(void)
{
	cout<<t<<endl;
}

int main(int argc, char **argv)
{
	AAA<int> a;

	a.test_func(1);
	a.print();

	AAA<double> b;

	b.test_func(1.23);
	b.print();

	return 0;
}

template2.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>

using namespace std;


template<typename T>
class AAA {
private:
	T t;
public:
	void test_func(const T &t);
	void print(void);
};

template<typename T> void AAA<T>::test_func(const T &t)
{
	this->t = t;
}
template<typename T>
void AAA<T>::print(void)
{
	cout<<t<<endl;
}


template<>
class AAA<int> {
public:
	void test_func_int(const int & t)
	{
		cout<<t<<endl;
	}
	void print_int(void);
};

void AAA<int>::print_int(void)
{
	cout<<"for test"<<endl;
}

int main(int argc, char **argv)
{
	AAA<int> a;

	a.test_func_int(1);
	a.print_int();

	AAA<double> b;

	b.test_func(1.23);
	b.print();

	return 0;
}

exception.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>

using namespace std;

void C()
{
	throw 1;
}

void B()
{
	C();
}

void A()
{
	try {
		B();
	} catch (int i)
	{
		cout<<"catch exception "<<i<<endl;
	}
}


int main(int argc, char **argv)
{
	A();
	return 0;
}

exception2.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>

using namespace std;

void C(int i)
{
	int a = 1;
	double b= 1.2;
	float c = 1.3;

	if (i == 0)
	{
		cout<<"In C, it is OK"<<endl;
	}
	else if (i == 1)
		throw a;
	else if (i == 2)
		throw b;
	else 
		throw c;
}

void B(int i)
{
	cout<<"call C ..."<<endl;
	C(i);
	cout<<"After call C"<<endl;
}

void A(int i)
{
	try {
		B(i);
	} catch (int j)
	{
		cout<<"catch exception "<<j<<endl;
	}
}


int main(int argc, char **argv)
{
	int i;
	if (argc != 2)
	{
		cout<<"Usage: "<<endl;
		cout<<argv[0]<<" <0|1|2|3>"<<endl;
		return -1;
	}

	i = strtoul(argv[1], NULL, 0);

	A(i);
	
	return 0;
}

exception3.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>

using namespace std;

void C(int i)
{
	int a = 1;
	double b= 1.2;
	float c = 1.3;

	if (i == 0)
	{
		cout<<"In C, it is OK"<<endl;
	}
	else if (i == 1)
		throw a;
	else if (i == 2)
		throw b;
	else 
		throw c;
}

void B(int i)
{
	cout<<"call C ..."<<endl;
	C(i);
	cout<<"After call C"<<endl;
}

void A(int i)
{
	try {
		B(i);
	} catch (int j)
	{
		cout<<"catch int exception "<<j<<endl;
	} catch (double d)
	{
		cout<<"catch double exception "<<d<<endl;
	} catch (...){
		cout<<"catch other exception "<<endl;
	}
}


int main(int argc, char **argv)
{
	int i;
	if (argc != 2)
	{
		cout<<"Usage: "<<endl;
		cout<<argv[0]<<" <0|1|2|3>"<<endl;
		return -1;
	}

	i = strtoul(argv[1], NULL, 0);

	A(i);
	
	return 0;
}

exception4.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>

using namespace std;

class MyException {
public:
	void what(void) { cout<<"This is MyException"<<endl; }
};


void C(int i)
{
	int a = 1;
	double b= 1.2;
	float c = 1.3;

	if (i == 0)
	{
		cout<<"In C, it is OK"<<endl;
	}
	else if (i == 1)
		throw a;
	else if (i == 2)
		throw b;
	else if (i == 3)
		throw c;
	else if (i == 4)
		throw MyException();
}

void B(int i)
{
	cout<<"call C ..."<<endl;
	C(i);
	cout<<"After call C"<<endl;
}

void A(int i)
{
	try {
		B(i);
	} catch (int j)
	{
		cout<<"catch int exception "<<j<<endl;
	} catch (double d)
	{
		cout<<"catch double exception "<<d<<endl;
	} catch (MyException &e)
	{
		e.what();
	} catch (...){
		cout<<"catch other exception "<<endl;
	}
}


int main(int argc, char **argv)
{
	int i;
	if (argc != 2)
	{
		cout<<"Usage: "<<endl;
		cout<<argv[0]<<" <0|1|2|3>"<<endl;
		return -1;
	}

	i = strtoul(argv[1], NULL, 0);

	A(i);
	
	return 0;
}

exception5.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>

using namespace std;

class MyException {
public:
	void what(void) { cout<<"This is MyException"<<endl; }
};

class MySubException : public MyException{
public:
	void what(void) { cout<<"This is MySubException"<<endl; }
};


void C(int i)
{
	int a = 1;
	double b= 1.2;
	float c = 1.3;

	if (i == 0)
	{
		cout<<"In C, it is OK"<<endl;
	}
	else if (i == 1)
		throw a;
	else if (i == 2)
		throw b;
	else if (i == 3)
		throw c;
	else if (i == 4)
		throw MyException();
	else if (i == 5)
		throw MySubException();
}

void B(int i)
{
	cout<<"call C ..."<<endl;
	C(i);
	cout<<"After call C"<<endl;
}

void A(int i)
{
	try {
		B(i);
	} catch (int j)
	{
		cout<<"catch int exception "<<j<<endl;
	} catch (double d)
	{
		cout<<"catch double exception "<<d<<endl;
	} catch (MySubException &e)
	{
		e.what();
	} catch (MyException &e)
	{
		e.what();
	} catch (...){
		cout<<"catch other exception "<<endl;
	}
}


int main(int argc, char **argv)
{
	int i;
	if (argc != 2)
	{
		cout<<"Usage: "<<endl;
		cout<<argv[0]<<" <0|1|2|3>"<<endl;
		return -1;
	}

	i = strtoul(argv[1], NULL, 0);

	A(i);
	
	return 0;
}

exception6.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>

using namespace std;

class MyException {
public:
	virtual void what(void) { cout<<"This is MyException"<<endl; }
};

class MySubException : public MyException{
public:
	void what(void) { cout<<"This is MySubException"<<endl; }
};


void C(int i)
{
	int a = 1;
	double b= 1.2;
	float c = 1.3;

	if (i == 0)
	{
		cout<<"In C, it is OK"<<endl;
	}
	else if (i == 1)
		throw a;
	else if (i == 2)
		throw b;
	else if (i == 3)
		throw c;
	else if (i == 4)
		throw MyException();
	else if (i == 5)
		throw MySubException();
}

void B(int i)
{
	cout<<"call C ..."<<endl;
	C(i);
	cout<<"After call C"<<endl;
}

void A(int i)
{
	try {
		B(i);
	} catch (int j)
	{
		cout<<"catch int exception "<<j<<endl;
	} catch (double d)
	{
		cout<<"catch double exception "<<d<<endl;
	} catch (MyException &e)
	{
		e.what();
	} catch (...){
		cout<<"catch other exception "<<endl;
	}
}


int main(int argc, char **argv)
{
	int i;
	if (argc != 2)
	{
		cout<<"Usage: "<<endl;
		cout<<argv[0]<<" <0|1|2|3>"<<endl;
		return -1;
	}

	i = strtoul(argv[1], NULL, 0);

	A(i);
	
	return 0;
}

exception7.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>

using namespace std;

class MyException {
public:
	virtual void what(void) { cout<<"This is MyException"<<endl; }
};

class MySubException : public MyException{
public:
	void what(void) { cout<<"This is MySubException"<<endl; }
};


void C(int i) throw(int, double)
{
	int a = 1;
	double b= 1.2;
	float c = 1.3;

	if (i == 0)
	{
		cout<<"In C, it is OK"<<endl;
	}
	else if (i == 1)
		throw a;
	else if (i == 2)
		throw b;
	else if (i == 3)
		throw c;
	else if (i == 4)
		throw MyException();
	else if (i == 5)
		throw MySubException();
}

void B(int i)
{
	cout<<"call C ..."<<endl;
	C(i);
	cout<<"After call C"<<endl;
}

void A(int i)
{
	try {
		B(i);
	} catch (int j)
	{
		cout<<"catch int exception "<<j<<endl;
	} catch (double d)
	{
		cout<<"catch double exception "<<d<<endl;
	} catch (MyException &e)
	{
		e.what();
	} catch (...){
		cout<<"catch other exception "<<endl;
	}
}

void my_unexpected_func() 
{
	cout<<"my_unexpected_func"<<endl;
}

void my_terminate_func () { cout<<"my_terminate_func"<<endl; }  


int main(int argc, char **argv)
{
	int i;

	set_unexpected (my_unexpected_func);
	set_terminate(my_terminate_func);
	
	if (argc != 2)
	{
		cout<<"Usage: "<<endl;
		cout<<argv[0]<<" <0|1|2|3>"<<endl;
		return -1;
	}

	i = strtoul(argv[1], NULL, 0);

	A(i);
	
	return 0;
}

exception8.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>

using namespace std;

class MyException {
public:
	virtual void what(void) { cout<<"This is MyException"<<endl; }
};

class MySubException : public MyException{
public:
	void what(void) { cout<<"This is MySubException"<<endl; }
};


void C(int i) throw(int, double)
{
	int a = 1;
	double b= 1.2;
	float c = 1.3;

	if (i == 0)
	{
		cout<<"In C, it is OK"<<endl;
	}
	else if (i == 1)
		throw a;
	else if (i == 2)
		throw b;
	else if (i == 3)
		throw c;
	else if (i == 4)
		throw MyException();
	else if (i == 5)
		throw MySubException();
}

void B(int i)
{
	cout<<"call C ..."<<endl;
	C(i);
	cout<<"After call C"<<endl;
}

void A(int i)
{
	try {
		B(i);
	} catch (int j)
	{
		cout<<"catch int exception "<<j<<endl;
	} catch (MyException &e)
	{
		e.what();
	} 
}

void my_unexpected_func() 
{
	cout<<"my_unexpected_func"<<endl;
}

void my_terminate_func () { cout<<"my_terminate_func"<<endl; }  


int main(int argc, char **argv)
{
	int i;

	set_unexpected (my_unexpected_func);
	set_terminate(my_terminate_func);
	
	if (argc != 2)
	{
		cout<<"Usage: "<<endl;
		cout<<argv[0]<<" <0|1|2|3>"<<endl;
		return -1;
	}

	i = strtoul(argv[1], NULL, 0);

	A(i);
	
	return 0;
}

18th_exception

exception.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>

using namespace std;

void C()
{
	throw 1;
}

void B()
{
	C();
}

void A()
{
	try {
		B();
	} catch (int i)
	{
		cout<<"catch exception "<<i<<endl;
	}
}


int main(int argc, char **argv)
{
	A();
	return 0;
}

exception2.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>

using namespace std;

void C(int i)
{
	int a = 1;
	double b= 1.2;
	float c = 1.3;

	if (i == 0)
	{
		cout<<"In C, it is OK"<<endl;
	}
	else if (i == 1)
		throw a;
	else if (i == 2)
		throw b;
	else 
		throw c;
}

void B(int i)
{
	cout<<"call C ..."<<endl;
	C(i);
	cout<<"After call C"<<endl;
}

void A(int i)
{
	try {
		B(i);
	} catch (int j)
	{
		cout<<"catch exception "<<j<<endl;
	}
}


int main(int argc, char **argv)
{
	int i;
	if (argc != 2)
	{
		cout<<"Usage: "<<endl;
		cout<<argv[0]<<" <0|1|2|3>"<<endl;
		return -1;
	}

	i = strtoul(argv[1], NULL, 0);

	A(i);
	
	return 0;
}

exception3.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>

using namespace std;

void C(int i)
{
	int a = 1;
	double b= 1.2;
	float c = 1.3;

	if (i == 0)
	{
		cout<<"In C, it is OK"<<endl;
	}
	else if (i == 1)
		throw a;
	else if (i == 2)
		throw b;
	else 
		throw c;
}

void B(int i)
{
	cout<<"call C ..."<<endl;
	C(i);
	cout<<"After call C"<<endl;
}

void A(int i)
{
	try {
		B(i);
	} catch (int j)
	{
		cout<<"catch int exception "<<j<<endl;
	} catch (double d)
	{
		cout<<"catch double exception "<<d<<endl;
	} catch (...){
		cout<<"catch other exception "<<endl;
	}
}


int main(int argc, char **argv)
{
	int i;
	if (argc != 2)
	{
		cout<<"Usage: "<<endl;
		cout<<argv[0]<<" <0|1|2|3>"<<endl;
		return -1;
	}

	i = strtoul(argv[1], NULL, 0);

	A(i);
	
	return 0;
}

exception4.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>

using namespace std;

class MyException {
public:
	void what(void) { cout<<"This is MyException"<<endl; }
};


void C(int i)
{
	int a = 1;
	double b= 1.2;
	float c = 1.3;

	if (i == 0)
	{
		cout<<"In C, it is OK"<<endl;
	}
	else if (i == 1)
		throw a;
	else if (i == 2)
		throw b;
	else if (i == 3)
		throw c;
	else if (i == 4)
		throw MyException();
}

void B(int i)
{
	cout<<"call C ..."<<endl;
	C(i);
	cout<<"After call C"<<endl;
}

void A(int i)
{
	try {
		B(i);
	} catch (int j)
	{
		cout<<"catch int exception "<<j<<endl;
	} catch (double d)
	{
		cout<<"catch double exception "<<d<<endl;
	} catch (MyException &e)
	{
		e.what();
	} catch (...){
		cout<<"catch other exception "<<endl;
	}
}


int main(int argc, char **argv)
{
	int i;
	if (argc != 2)
	{
		cout<<"Usage: "<<endl;
		cout<<argv[0]<<" <0|1|2|3>"<<endl;
		return -1;
	}

	i = strtoul(argv[1], NULL, 0);

	A(i);
	
	return 0;
}

exception5.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>

using namespace std;

class MyException {
public:
	void what(void) { cout<<"This is MyException"<<endl; }
};

class MySubException : public MyException{
public:
	void what(void) { cout<<"This is MySubException"<<endl; }
};


void C(int i)
{
	int a = 1;
	double b= 1.2;
	float c = 1.3;

	if (i == 0)
	{
		cout<<"In C, it is OK"<<endl;
	}
	else if (i == 1)
		throw a;
	else if (i == 2)
		throw b;
	else if (i == 3)
		throw c;
	else if (i == 4)
		throw MyException();
	else if (i == 5)
		throw MySubException();
}

void B(int i)
{
	cout<<"call C ..."<<endl;
	C(i);
	cout<<"After call C"<<endl;
}

void A(int i)
{
	try {
		B(i);
	} catch (int j)
	{
		cout<<"catch int exception "<<j<<endl;
	} catch (double d)
	{
		cout<<"catch double exception "<<d<<endl;
	} catch (MySubException &e)
	{
		e.what();
	} catch (MyException &e)
	{
		e.what();
	} catch (...){
		cout<<"catch other exception "<<endl;
	}
}


int main(int argc, char **argv)
{
	int i;
	if (argc != 2)
	{
		cout<<"Usage: "<<endl;
		cout<<argv[0]<<" <0|1|2|3>"<<endl;
		return -1;
	}

	i = strtoul(argv[1], NULL, 0);

	A(i);
	
	return 0;
}

exception6.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>

using namespace std;

class MyException {
public:
	virtual void what(void) { cout<<"This is MyException"<<endl; }
};

class MySubException : public MyException{
public:
	void what(void) { cout<<"This is MySubException"<<endl; }
};


void C(int i)
{
	int a = 1;
	double b= 1.2;
	float c = 1.3;

	if (i == 0)
	{
		cout<<"In C, it is OK"<<endl;
	}
	else if (i == 1)
		throw a;
	else if (i == 2)
		throw b;
	else if (i == 3)
		throw c;
	else if (i == 4)
		throw MyException();
	else if (i == 5)
		throw MySubException();
}

void B(int i)
{
	cout<<"call C ..."<<endl;
	C(i);
	cout<<"After call C"<<endl;
}

void A(int i)
{
	try {
		B(i);
	} catch (int j)
	{
		cout<<"catch int exception "<<j<<endl;
	} catch (double d)
	{
		cout<<"catch double exception "<<d<<endl;
	} catch (MyException &e)
	{
		e.what();
	} catch (...){
		cout<<"catch other exception "<<endl;
	}
}


int main(int argc, char **argv)
{
	int i;
	if (argc != 2)
	{
		cout<<"Usage: "<<endl;
		cout<<argv[0]<<" <0|1|2|3>"<<endl;
		return -1;
	}

	i = strtoul(argv[1], NULL, 0);

	A(i);
	
	return 0;
}

exception7.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>

using namespace std;

class MyException {
public:
	virtual void what(void) { cout<<"This is MyException"<<endl; }
};

class MySubException : public MyException{
public:
	void what(void) { cout<<"This is MySubException"<<endl; }
};


void C(int i) throw(int, double)
{
	int a = 1;
	double b= 1.2;
	float c = 1.3;

	if (i == 0)
	{
		cout<<"In C, it is OK"<<endl;
	}
	else if (i == 1)
		throw a;
	else if (i == 2)
		throw b;
	else if (i == 3)
		throw c;
	else if (i == 4)
		throw MyException();
	else if (i == 5)
		throw MySubException();
}

void B(int i)
{
	cout<<"call C ..."<<endl;
	C(i);
	cout<<"After call C"<<endl;
}

void A(int i)
{
	try {
		B(i);
	} catch (int j)
	{
		cout<<"catch int exception "<<j<<endl;
	} catch (double d)
	{
		cout<<"catch double exception "<<d<<endl;
	} catch (MyException &e)
	{
		e.what();
	} catch (...){
		cout<<"catch other exception "<<endl;
	}
}

void my_unexpected_func() 
{
	cout<<"my_unexpected_func"<<endl;
}

void my_terminate_func () { cout<<"my_terminate_func"<<endl; }  


int main(int argc, char **argv)
{
	int i;

	set_unexpected (my_unexpected_func);
	set_terminate(my_terminate_func);
	
	if (argc != 2)
	{
		cout<<"Usage: "<<endl;
		cout<<argv[0]<<" <0|1|2|3>"<<endl;
		return -1;
	}

	i = strtoul(argv[1], NULL, 0);

	A(i);
	
	return 0;
}

exception8.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>

using namespace std;

class MyException {
public:
	virtual void what(void) { cout<<"This is MyException"<<endl; }
};

class MySubException : public MyException{
public:
	void what(void) { cout<<"This is MySubException"<<endl; }
};


void C(int i) throw(int, double)
{
	int a = 1;
	double b= 1.2;
	float c = 1.3;

	if (i == 0)
	{
		cout<<"In C, it is OK"<<endl;
	}
	else if (i == 1)
		throw a;
	else if (i == 2)
		throw b;
	else if (i == 3)
		throw c;
	else if (i == 4)
		throw MyException();
	else if (i == 5)
		throw MySubException();
}

void B(int i)
{
	cout<<"call C ..."<<endl;
	C(i);
	cout<<"After call C"<<endl;
}

void A(int i)
{
	try {
		B(i);
	} catch (int j)
	{
		cout<<"catch int exception "<<j<<endl;
	} catch (MyException &e)
	{
		e.what();
	} 
}

void my_unexpected_func() 
{
	cout<<"my_unexpected_func"<<endl;
}

void my_terminate_func () { cout<<"my_terminate_func"<<endl; }  


int main(int argc, char **argv)
{
	int i;

	set_unexpected (my_unexpected_func);
	set_terminate(my_terminate_func);
	
	if (argc != 2)
	{
		cout<<"Usage: "<<endl;
		cout<<argv[0]<<" <0|1|2|3>"<<endl;
		return -1;
	}

	i = strtoul(argv[1], NULL, 0);

	A(i);
	
	return 0;
}

19th_smartpointer

person.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>

using namespace std;

class Person {

public:

	Person() {
		cout <<"Pserson()"<<endl;
	}


	~Person()
	{
		cout << "~Person()"<<endl;
	}
	void printInfo(void)
	{
		cout<<"just a test function"<<endl;
	}
};

void test_func(void)
{
	Person *p = new Person();
	p->printInfo();
}

int main(int argc, char **argv)
{	
	int i;

	for (i = 0; i < 2; i++)
		test_func();
	return 0;
}

person2.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>

using namespace std;

class Person {

public:

	Person() {
		cout <<"Pserson()"<<endl;
	}


	~Person()
	{
		cout << "~Person()"<<endl;
	}
	void printInfo(void)
	{
		cout<<"just a test function"<<endl;
	}
};

void test_func(void)
{
	//Person *p = new Person();
	Person per;
	per.printInfo();
}

int main(int argc, char **argv)
{	
	int i;

	for (i = 0; i < 2; i++)
		test_func();
	return 0;
}

person3.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>

using namespace std;

class Person {

public:

	Person() {
		cout <<"Pserson()"<<endl;
	}


	~Person()
	{
		cout << "~Person()"<<endl;
	}
	void printInfo(void)
	{
		cout<<"just a test function"<<endl;
	}
};

class sp {
private:
	Person *p;

public:
	sp() : p(0) {}
	
	sp(Person *other)
	{
		cout<<"sp(const Person *other)"<<endl;
		p = other;
	}

	~sp()
	{
		cout<<"~sp()"<<endl;
		if (p)
			delete p;
	}

	Person *operator->()
	{
		return p;
	}
	
};

void test_func(void)
{
	sp s = new Person();

	s->printInfo();

	//Person *p = new Person();
	//p->printInfo();
	//delete p;

	
}

int main(int argc, char **argv)
{	
	int i;

	for (i = 0; i < 2; i++)
		test_func();
	return 0;
}

person4.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>

using namespace std;

class Person {

public:

	Person() {
		cout <<"Pserson()"<<endl;
	}


	~Person()
	{
		cout << "~Person()"<<endl;
	}
	void printInfo(void)
	{
		cout<<"just a test function"<<endl;
	}
};

class sp {
private:
	Person *p;

public:
	sp() : p(0) {}
	
	sp(Person *other)
	{
		cout<<"sp(const Person *other)"<<endl;
		p = other;
	}

	sp(sp &other)
	{
		cout<<"sp(const Person *other)"<<endl;
		p = other.p;
	}

	~sp()
	{
		cout<<"~sp()"<<endl;
		if (p)
			delete p;
	}

	Person *operator->()
	{
		return p;
	}
	
};

void test_func(sp &other)
{
	sp s = other;

	s->printInfo();

	//Person *p = new Person();
	//p->printInfo();
	//delete p;

	
}

int main(int argc, char **argv)
{	
	int i;

	/* 相当于:
	 * 1. Person *p = new Person();
	 * 2. sp tmp(p);  ==> sp(Person *other)
	 * 3.
	 * 3.1 sp other(tmp);  ==> sp(sp &other2)
	       问题在于: sp &other2 = tmp; // 错误语法
	                 const sp& other2 = tmp; //ok
	 * 或
	 * 3.2 sp other(tmp ==> Person*);  ==>sp(Person *other)
	 */
	
	sp other = new Person();

	for (i = 0; i < 2; i++)
		test_func(other);
	return 0;
}

person5.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>

using namespace std;

class Person {

public:

	Person() {
		cout <<"Pserson()"<<endl;
	}


	~Person()
	{
		cout << "~Person()"<<endl;
	}
	void printInfo(void)
	{
		cout<<"just a test function"<<endl;
	}
};

class sp {
private:
	Person *p;

public:
	sp() : p(0) {}
	
	sp(Person *other)
	{
		cout<<"sp(Person *other)"<<endl;
		p = other;
	}

	sp(const sp &other)
	{
		cout<<"sp(const sp &other)"<<endl;
		p = other.p;
	}

	~sp()
	{
		cout<<"~sp()"<<endl;
		if (p)
			delete p;
	}

	Person *operator->()
	{
		return p;
	}
	
};

void test_func(sp &other)
{
	sp s = other;

	s->printInfo();

	//Person *p = new Person();
	//p->printInfo();
	//delete p;

	
}

int main(int argc, char **argv)
{	
	int i;

	sp other = new Person();

	for (i = 0; i < 2; i++)
		test_func(other);
	return 0;
}

person6.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>

using namespace std;

class Person {
private:
	int count;

public:
	void incStrong(){ count++; }	
	void decStrong(){ count--; }	
	int getStrongCount(){ return count;}

	Person() : count(0){
		cout <<"Pserson()"<<endl;
	}


	~Person()
	{
		cout << "~Person()"<<endl;
	}
	void printInfo(void)
	{
		cout<<"just a test function"<<endl;
	}
};

class sp {
private:
	Person *p;

public:
	sp() : p(0) {}
	
	sp(Person *other)
	{
		cout<<"sp(Person *other)"<<endl;
		p = other;
		p->incStrong();
	}

	sp(const sp &other)
	{
		cout<<"sp(const sp &other)"<<endl;
		p = other.p;
		p->incStrong();
	}

	~sp()
	{
		cout<<"~sp()"<<endl;
		
		if (p)
		{
			p->decStrong();
			if (p->getStrongCount() == 0)
			{
				delete p;
				p = NULL;
			}
		}
	}

	Person *operator->()
	{
		return p;
	}
	
};

void test_func(sp &other)
{
	sp s = other;

	cout<<"In test_func: "<<s->getStrongCount()<<endl;

	s->printInfo();

	//Person *p = new Person();
	//p->printInfo();
	//delete p;

	
}

int main(int argc, char **argv)
{	
	int i;

	sp other = new Person();

	cout<<"Before call test_func: "<<other->getStrongCount()<<endl;

	for (i = 0; i < 2; i++)
	{
		test_func(other);
		cout<<"After call test_func: "<<other->getStrongCount()<<endl;
	}
	return 0;
}

person7.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>

using namespace std;

class Person {
private:
	int count;

public:
	void incStrong(){ count++; }	
	void decStrong(){ count--; }	
	int getStrongCount(){ return count;}

	Person() : count(0){
		cout <<"Pserson()"<<endl;
	}


	~Person()
	{
		cout << "~Person()"<<endl;
	}
	void printInfo(void)
	{
		cout<<"just a test function"<<endl;
	}
};

class sp {
private:
	Person *p;

public:
	sp() : p(0) {}
	
	sp(Person *other)
	{
		cout<<"sp(Person *other)"<<endl;
		p = other;
		p->incStrong();
	}

	sp(const sp &other)
	{
		cout<<"sp(const sp &other)"<<endl;
		p = other.p;
		p->incStrong();
	}

	~sp()
	{
		cout<<"~sp()"<<endl;
		
		if (p)
		{
			p->decStrong();
			if (p->getStrongCount() == 0)
			{
				delete p;
				p = NULL;
			}
		}
	}

	Person *operator->()
	{
		return p;
	}

	Person& operator*()
	{
		return *p;
	}
	
};

void test_func(sp &other)
{
	sp s = other;

	cout<<"In test_func: "<<s->getStrongCount()<<endl;

	s->printInfo();

	//Person *p = new Person();
	//p->printInfo();
	//delete p;

	
}

int main(int argc, char **argv)
{	
	int i;

	/* 少用"Person *"; 用"sp"来代替"Person *"
	 * Person *per; 
	 * 有2种操作: per->XXXx, (*per).XXX
	 * sp也应该有这2中操作:
	 *            sp->XXX, (*sp).XXX
	 *
	 */
	sp other = new Person();

	(*other).printInfo();
	cout<<"Before call test_func: "<<other->getStrongCount()<<endl;

	for (i = 0; i < 2; i++)
	{
		test_func(other);
		cout<<"After call test_func: "<<other->getStrongCount()<<endl;
	}
	return 0;
}

person8.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>

using namespace std;

class RefBase {
private:
	int count;

public:
	RefBase() : count(0) {}
	void incStrong(){ count++; }	
	void decStrong(){ count--; }	
	int getStrongCount(){ return count;}
};

class Person : public RefBase{

public:
	Person() {
		cout <<"Pserson()"<<endl;
	}


	~Person()
	{
		cout << "~Person()"<<endl;
	}
	void printInfo(void)
	{
		cout<<"just a test function"<<endl;
	}
};

class sp {
private:
	Person *p;

public:
	sp() : p(0) {}
	
	sp(Person *other)
	{
		cout<<"sp(Person *other)"<<endl;
		p = other;
		p->incStrong();
	}

	sp(const sp &other)
	{
		cout<<"sp(const sp &other)"<<endl;
		p = other.p;
		p->incStrong();
	}

	~sp()
	{
		cout<<"~sp()"<<endl;
		
		if (p)
		{
			p->decStrong();
			if (p->getStrongCount() == 0)
			{
				delete p;
				p = NULL;
			}
		}
	}

	Person *operator->()
	{
		return p;
	}

	Person& operator*()
	{
		return *p;
	}
	
};

void test_func(sp &other)
{
	sp s = other;

	cout<<"In test_func: "<<s->getStrongCount()<<endl;

	s->printInfo();

	//Person *p = new Person();
	//p->printInfo();
	//delete p;

	
}

int main(int argc, char **argv)
{	
	int i;

	/* 少用"Person *"; 用"sp"来代替"Person *"
	 * Person *per; 
	 * 有2种操作: per->XXXx, (*per).XXX
	 * sp也应该有这2中操作:
	 *            sp->XXX, (*sp).XXX
	 *
	 */
	sp other = new Person();

	(*other).printInfo();
	cout<<"Before call test_func: "<<other->getStrongCount()<<endl;

	for (i = 0; i < 2; i++)
	{
		test_func(other);
		cout<<"After call test_func: "<<other->getStrongCount()<<endl;
	}
	return 0;
}

person9.cpp

cpp 复制代码 
#include <iostream>
#include <string.h>
#include <unistd.h>

using namespace std;

class RefBase {
private:
	int count;

public:
	RefBase() : count(0) {}
	void incStrong(){ count++; }	
	void decStrong(){ count--; }	
	int getStrongCount(){ return count;}
};

class Person : public RefBase{

public:
	Person() {
		cout <<"Pserson()"<<endl;
	}


	~Person()
	{
		cout << "~Person()"<<endl;
	}
	void printInfo(void)
	{
		cout<<"just a test function"<<endl;
	}
};

template<typename T>
class sp {
private:
	T *p;

public:
	sp() : p(0) {}
	
	sp(T *other)
	{
		cout<<"sp(T *other)"<<endl;
		p = other;
		p->incStrong();
	}

	sp(const sp &other)
	{
		cout<<"sp(const sp &other)"<<endl;
		p = other.p;
		p->incStrong();
	}

	~sp()
	{
		cout<<"~sp()"<<endl;
		
		if (p)
		{
			p->decStrong();
			if (p->getStrongCount() == 0)
			{
				delete p;
				p = NULL;
			}
		}
	}

	T *operator->()
	{
		return p;
	}

	T& operator*()
	{
		return *p;
	}
	
};

template<typename T>
void test_func(sp<T> &other)
{
	sp<T> s = other;

	cout<<"In test_func: "<<s->getStrongCount()<<endl;

	s->printInfo();

	//Person *p = new Person();
	//p->printInfo();
	//delete p;

	
}

int main(int argc, char **argv)
{	
	int i;

	/* 少用"Person *"; 用"sp<Person>"来代替"Person *"
	 * Person *per; 
	 * 有2种操作: per->XXXx, (*per).XXX
	 * sp也应该有这2中操作:
	 *            sp->XXX, (*sp).XXX
	 *
	 */
	sp<Person> other = new Person();

	(*other).printInfo();
	cout<<"Before call test_func: "<<other->getStrongCount()<<endl;

	for (i = 0; i < 2; i++)
	{
		test_func(other);
		cout<<"After call test_func: "<<other->getStrongCount()<<endl;
	}
	return 0;
}
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