理解构造函数和析构函数的调用顺序

博客通过C++代码示例,展示了构造函数和析构函数的调用顺序。定义了多个类,包括基类和派生类,以及成员类。创建派生类对象时,输出文件记录了构造和析构的顺序,有助于理解面向对象编程中构造与析构的执行逻辑。
None.gif#include <fstream>
None.gif
None.gif
using namespace std;
None.gif
None.gifofstream 
out ("order.txt");
None.gif
#define CLASS(ID) class ID{\
None.gif
public: \
ExpandedBlockStart.gifContractedBlock.gif ID(
intdot.gif{out << #ID " constructor\n";}\
ExpandedBlockStart.gifContractedBlock.gif 
~ID() dot.gif{out << #ID " destructor\n";}\
None.gif};
None.gif
None.gifCLASS(base1);
None.gifCLASS(member1);
None.gifCLASS(member2);
None.gifCLASS(member3);
None.gifCLASS(member4);
None.gif
None.gif
class derived1 : public base1
ExpandedBlockStart.gifContractedBlock.gif
dot.gif{
InBlock.gif member1 m1;
InBlock.gif member2 m2;
InBlock.gif
public:
InBlock.gif derived1(
int) : m2(1), m1(2), base1(3)
ExpandedSubBlockStart.gifContractedSubBlock.gif 
dot.gif{
InBlock.gif  
out << "derived1 constructor\n";
ExpandedSubBlockEnd.gif }

InBlock.gif
InBlock.gif 
~derived1()
ExpandedSubBlockStart.gifContractedSubBlock.gif 
dot.gif{
InBlock.gif  
out << "derived1 destructor\n";
ExpandedSubBlockEnd.gif }

ExpandedBlockEnd.gif}
;
None.gif
None.gif
class derived2 : public derived1
ExpandedBlockStart.gifContractedBlock.gif
dot.gif{
InBlock.gif member3 m3;
InBlock.gif member4 m4;
InBlock.gif
public:
InBlock.gif derived2():m3(
1),derived1(2),m4(3)
ExpandedSubBlockStart.gifContractedSubBlock.gif 
dot.gif{
InBlock.gif  
out << "derived2 constructor\n";
ExpandedSubBlockEnd.gif }

InBlock.gif 
~derived2()
ExpandedSubBlockStart.gifContractedSubBlock.gif 
dot.gif{
InBlock.gif  
out << "derived2 destructor\n";
ExpandedSubBlockEnd.gif }

ExpandedBlockEnd.gif}
;
None.gif
None.gif
None.gif
int _tmain(int argc, _TCHAR* argv[])
ExpandedBlockStart.gifContractedBlock.gif
dot.gif{
InBlock.gif derived2 d2;
InBlock.gif 
return 0;
ExpandedBlockEnd.gif}

None.gif
None.giforder.txt的输出内容:
None.gifbase1 constructor
None.gifmember1 constructor
None.gifmember2 constructor
None.gifderived1 constructor
None.gifmember3 constructor
None.gifmember4 constructor
None.gifderived2 constructor
None.gifderived2 destructor
None.gifmember4 destructor
None.gifmember3 destructor
None.gifderived1 destructor
None.gifmember2 destructor
None.gifmember1 destructor
None.gifbase1 destructor
None.gif

转载于:https://www.cnblogs.com/hunter_gio/archive/2005/05/11/153110.html

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