Professional C++读书随笔(2)

Professional C++读书随笔(2)

C++ 中的抽象类其实就是纯虚函数组成的类，如下所示:

class  SpreadsheetCell
{
public:
    SpreadsheetCell();
    virtual ~SpreadsheetCell();
    virtual void set(const std::string& inString) = 0;
    virtual std::string getString() const = 0;
} ;

An abstract class provides a way to prevent other code from instantiating an object directly, as opposed to one of its subclasses.
抽象类只能被扩展，不能创建一个与他某个子类相冲突的对象实例！

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