shared_ptr과 포인터 변환에 대한 질문2

int x = 1;
int y = 16;
float z = 32.0;
TRACE( "This is a TRACE statement\n" );
 
TRACE( "The value of x is %d\n", x );
 
TRACE( "x = %d and y = %d\n", x, y );
 
TRACE( "x = %d and y = %x and z = %f\n", x, y, z );

#include <iostream>
#include <memory.h>
#include <stdio.h>
#include <string.h>
#include <atomic>
 
 
#include <memory>
#include <thread>
#include <chrono>
#include <mutex>
#include <functional>
 
 
using namespace std;
 
 
class StringContainer
{
public:
	StringContainer();
	virtual ~StringContainer()
	{
		printf("~StringContainer() 소멸자 : %x : %s\n", this, m_myname.c_str());
	}
 
	string m_myname;
	char tmp_array[32];
};
 
StringContainer::StringContainer()
{
	printf("StringContainer() 생성자 : %x : %s\n", this, m_myname.c_str());
	printf("this         :  %x\n", this);
	printf("tmp_array    :  %x\n", tmp_array);
 
	memset(tmp_array, 0, sizeof(tmp_array));
	strcpy(tmp_array, "dream comes true!!!");
}
 
 
long long extern_raw_cstring_address;
std::shared_ptr<StringContainer> ext_cr;
 
 
 
//function A()
void A()
{
	printf("---------------------------------------------------------A()\n");
	StringContainer * p = new StringContainer();
	p->m_myname = "A()";
 
#if 0
포인터를 공유하는 방법??
	std::shared_ptr<StringContainer>* p = (shared_ptr<StringContainer>*)new StringContainer();
    shared_ptr<StringContainer> sp2 = shared_ptr<StringContainer>(p);
    shared_ptr<StringContainer> sp1(p);
#endif
 
	//shared_ptr 을 지역변수로 사용하면. 함수가 return 될때. 소멸자가 함께 호출됩니다. 
	//shared_ptr 은 같은 주소를 함께 참조하면 오류가 발생합니다.
    shared_ptr<StringContainer> sp1(p);
 
	extern_raw_cstring_address = (long long)p;
 
	printf("A() p                : %x\n", p           );
	printf("A() p->tmp_array     : %x\n", p->tmp_array);
	printf("A() p->tmp_array     : %s\n", p->tmp_array);
	printf("_msize               : %d\n", _msize(p)   );
}
 
//function B()
void B()
{
	printf("---------------------------------------------B()\n");
 
    std::shared_ptr<StringContainer> * test_cstring = reinterpret_cast<shared_ptr<StringContainer> * >(extern_raw_cstring_address); //캐스팅된 변수가 이상함1
 
	StringContainer * p = (StringContainer*) test_cstring;
 
	printf("BB() p               : %x\n", p);
	printf("BB() p->tmp_array    : %s\n", p->tmp_array);
	printf("_msize               : %d\n", _msize(p));
}
 
void A2()
{
	printf("---------------------------------------------------------A2()\n");
	StringContainer * p = new StringContainer();
	p->m_myname = "A2()";
	ext_cr = shared_ptr<StringContainer>(p);
	printf("A2() p->tmp_array    : %x\n", p->tmp_array);
	printf("A2() p->tmp_array    : %s\n", p->tmp_array);
	printf("_msize               : %d\n", _msize(p));
} 
 
void B2()
{
	printf("---------------------------------------------B2()\n");
	StringContainer * p = ext_cr.get();
 
	printf("B2() p->tmp_array    : %x\n", p->tmp_array);
	printf("B2() p->tmp_array    : %s\n", p->tmp_array);
	printf("_msize               : %d\n", _msize(p));
//shared_ptr 을 전역변수로 사용하더라도. main함수가 return 될때.
//소멸자가 자동으로 호출됩니다. delete p; 를 하지 않아도 되는 경우가 있습니다.
}
 
 
int n;
void AA()
{
	printf("---------------------------------------------------------AA()\n");
	StringContainer * p = new StringContainer();
	p->m_myname = "AA()";
 
	n = (int)p;
 
	printf("AA() p    : %x\n", p);
	printf("AA() p    : %s\n", p->tmp_array);
	printf("_msize    :  %d\n", _msize(p));
}
 
void BB()
{
	printf("---------------------------------------------BB()\n");
 
	StringContainer * p = (StringContainer*)n;
 
	printf("BB() p    : %x\n", p);
	printf("BB() p    : %s\n", p->tmp_array);
	printf("_msize    :  %d\n", _msize(p));
	delete p;
}
 
void F1()
{
	printf("---------------------------------------------------------F1()\n");
	char * p = new char[100];
	strcpy(p, "test");
	n = (int)p;
 
	printf("F1() p    : %x\n", p);
	printf("F1() p    : %s\n", p);
	printf("_msize    :  %d\n", _msize(p));
}
 
void F2()
{
	printf("---------------------------------------------F2()\n");
 
	char * p = (char*)n;
 
	printf("F2() p    : %x\n", p);
	printf("F2() p    : %s\n", p);
	printf("_msize    :  %d\n", _msize(p));
	delete [] p;
}
 
 
int main(int argc, char** argv) 
{
 
	A();
	B();
 
	A2();
	B2();
 
	AA();
	BB();
 
	F1();
	F2();
 
	printf("main end\n");
	return 0;
}
 
 
출력 결과
---------------------------------------------------------A()
StringContainer() 생성자 : 3d3f08 :
this         :  3d3f08
tmp_array    :  3d3f10
A() p                : 3d3f08
A() p->tmp_array     : 3d3f10
A() p->tmp_array     : dream comes true!!!
_msize               : 40
~StringContainer() 소멸자 : 3d3f08 : A()
---------------------------------------------B()
BB() p               : 3d3f08
BB() p->tmp_array    : dream comes true!!!
_msize               : 40
---------------------------------------------------------A2()
StringContainer() 생성자 : 3d3f08 :
this         :  3d3f08
tmp_array    :  3d3f10
A2() p->tmp_array    : 3d3f10
A2() p->tmp_array    : dream comes true!!!
_msize               : 40
---------------------------------------------B2()
B2() p->tmp_array    : 3d3f10
B2() p->tmp_array    : dream comes true!!!
_msize               : 40
---------------------------------------------------------AA()
StringContainer() 생성자 : 3d3f58 :
this         :  3d3f58
tmp_array    :  3d3f60
AA() p    : 3d3f58
AA() p    : dream comes true!!!
_msize    :  40
---------------------------------------------BB()
BB() p    : 3d3f58
BB() p    : dream comes true!!!
_msize    :  40
~StringContainer() 소멸자 : 3d3f58 : AA()
---------------------------------------------------------F1()
F1() p    : 3d3fa8
F1() p    : test
_msize    :  100
---------------------------------------------F2()
F2() p    : 3d3fa8
F2() p    : test
_msize    :  100
main end
~StringContainer() 소멸자 : 3d3f08 : A2()
 
--------------------------------
Process exited after 0.4688 seconds with return value 0
계속하려면 아무 키나 누르십시오 . . .