[英]Destructor with copy constructor
I want to use destructor in CPP, but, compiler is giving warning "undefined reference".我想在 CPP 中使用析构函数,但是编译器给出警告“未定义的引用”。
class trial{
private:
int number;
public:
trial(){};
trial(int num) {
number=num;
};
~trial();
};
Trial class constructor gets value from main function.试用 class 构造函数从主 function 获取值。 Help me by telling me whats incorrect in constructor.
通过告诉我构造函数中有什么不正确来帮助我。 Thanks in advance:)
提前致谢:)
It seems you declared the destuctor ~trial();
看来您声明了析构函数
~trial();
, but you did not define that. ,但你没有定义。
To define the destructor inside the class declaration, use {}
instead of ;
要在 class 声明中定义析构函数,请使用
{}
而不是;
like ~trial(){}
.像
~trial(){}
。
To define the destructor outside the class declaration (inside a source file), write like this:要在 class 声明之外(在源文件中)定义析构函数,可以这样写:
trial::~trial() {
// do what you want
}
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