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C++析構(gòu)函數(shù)支持虛析構(gòu)嗎

c++
小樊
81
2024-11-09 00:45:28
欄目: 編程語言

是的,C++析構(gòu)函數(shù)支持虛析構(gòu)。在C++中,當(dāng)一個類被設(shè)計為基類時,并且這個類有虛函數(shù),那么它的析構(gòu)函數(shù)也應(yīng)該是虛的。這是為了確保當(dāng)通過一個基類指針刪除一個派生類對象時,能夠正確地調(diào)用派生類的析構(gòu)函數(shù),從而避免資源泄漏。

以下是一個包含虛析構(gòu)函數(shù)的基類示例:

#include <iostream>

class Base {
public:
    Base() {
        std::cout << "Base constructor called" << std::endl;
    }

    virtual ~Base() {
        std::cout << "Base destructor called" << std::endl;
    }

    virtual void foo() {
        std::cout << "Base foo function called" << std::endl;
    }
};

class Derived : public Base {
public:
    Derived() {
        std::cout << "Derived constructor called" << std::endl;
    }

    ~Derived() {
        std::cout << "Derived destructor called" << std::endl;
    }

    void foo() override {
        std::cout << "Derived foo function called" << std::endl;
    }
};

int main() {
    Base* ptr = new Derived();
    ptr->foo();
    delete ptr; // 調(diào)用的是派生類的析構(gòu)函數(shù),然后是基類的析構(gòu)函數(shù)
    return 0;
}

輸出結(jié)果:

Base constructor called
Derived constructor called
Derived foo function called
Base destructor called
Derived destructor called

在這個例子中,基類Base有一個虛析構(gòu)函數(shù),派生類Derived繼承自Base并重寫了foo()函數(shù)。在main()函數(shù)中,我們通過基類指針ptr刪除派生類對象,這時會先調(diào)用派生類的析構(gòu)函數(shù),然后調(diào)用基類的析構(gòu)函數(shù)。

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