检查C ++中的指针定义

本文介绍了检查C ++中的指针定义的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

如何检查C ++中是否定义了变量(尤其是指针)?假设我有一堂课:

How do I check if a variable, specifically a pointer, is defined in C++? Suppose I have a class:

class MyClass {  
public:

    MyClass();

    ~MyClass() {
        delete pointer; // if defined!
    }

    initializePointer() {
        pointer = new OtherClass();
    }

private:

    OtherClass* pointer;

};

推荐答案

为什么要担心检查指针值?只需将其初始化为空指针值，然后对其调用delete.空指针上的delete不会执行任何操作(标准保证了此操作).

Why worry about checking for the pointers value? Just initialize it to a null pointer value and then just call delete on it. delete on a null pointer does nothing (the standard guarantees it).

class MyClass {  
public:

    MyClass():pointer(0) { }

    ~MyClass() {
        delete pointer;
        pointer = 0;
    }

    initializePointer() {
        pointer = new OtherClass();
    }

private:

    OtherClass* pointer;

};

每次调用delete时，都应将指针设置为空指针值.那你一切都好.

And everytime you call delete on it, you should set the pointer to a null pointer value. Then you are all fine.

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