?

?

代碼示例:

非虛析構(gòu)的情況下.

#include <stdio.h> #include <iostream>using namespace std;class A { public:A(){std::cout << "A is created." << std::endl;}~A(){std::cout << "A is deleted." << std::endl;} };class B : public A { public:B(){std::cout << "B is created." << std::endl;}~B(){std::cout << "B is deleted." << std::endl;} };int main() {A* pA = new B();delete pA;return 0; }

虛析構(gòu)的情況下.

#include <stdio.h> #include <iostream>using namespace std;class A { public:A(){std::cout << "A is created." << std::endl;}virtual ~A(){std::cout << "A is deleted." << std::endl;} };class B : public A { public:B(){std::cout << "B is created." << std::endl;}~B(){std::cout << "B is deleted." << std::endl;} };int main() {A* pA = new B();delete pA;return 0; }

?

如果在類型B中創(chuàng)建了一些資源，比如文件句柄、內(nèi)存等，在這種情況下都得不到釋放，從而導(dǎo)致資源泄漏。

轉(zhuǎn)載于:https://www.cnblogs.com/dsdr/p/6087115.html

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