*******************************interface是怎么回事？**********************************

[关门兔]

我看到了这样的代码：
interface aaa
{
virtual bbb() = 0;
};

class ccc : public aaa
{
};

问题：
1，interface是C++的吗？怎么用？
2，interface或从interface继承来的类，不用声明析构函数为virtual吗？

[KennyYuan]

Java

[关门兔]

但我是在VC DLL程序中看到的。
不讨论JAVA的INTERFACE，否则我就贴到JAVA版了。
我想知道它是标准C++的，还是微软的？好象C++里没有INTERFACE的概念。

[KennyYuan]

C++ Language Reference

__interfaceSee Also
C++ Keywords | Interface Attributes
Microsoft Specific

A Visual C++ interface can be defined as follows:

Can inherit from zero or more base interfaces.
Cannot inherit from a base class.
Can only contain public, pure virtual methods.
Cannot contain constructors, destructors, or operators.
Cannot contain static methods.
Cannot contain data members; properties are allowed.
modifier __interface interface-name {interface-definition}
A C++ class or struct could be implemented with these rules, but __interface enforces them.

For example, the following is a sample interface definition:

__interface IMyInterface
{
HRESULT CommitX();
HRESULT get_X(BSTR* pbstrName);
};
Notice that you do not have to explicitly indicate that the CommitX and get_X functions are pure virtual. An equivalent declaration for the first function would be:

virtual HRESULT CommitX() = 0;
It is possible to define a managed interface. For example,

__gc __interface IMyInterface
{
};

Only managed classes can implement managed interfaces. See __gc for more information.

__interface implies the novtable __declspec modifier.

For more information about interfaces, see 6 gc Interfaces.

END Microsoft Specific

[KennyYuan]

c#有interface，C++里是带下划线的

[关门兔]

在DDK中看到了这个：
#define interface struct

[Rocken]

看来这个东东是微软为了com编程而自定义出来的

[DouDouBug]

#define interface struct
一个结构定义而已

[关门兔]

真的没人知道吗？