c ++ cli接口事件显式实现 [英] c++ cli interface event explicit implementation

问题描述

我试图将c＃代码转换为c ++ / cli。一切顺利，直到我开始翻译界面事件显式实现为c ++ / cli语法。

I am trying to convert c# code into c++/cli. Everything went smoothly until i started translating interface event explicit implementations into c++/cli syntax.

让我们说c＃我有这个接口

Let's say in c# i have this interface

public interface Interface
{
    public event MyEventHandler Event;
}

这是在Class中以显式方式实现的，因此不会与另一个成员的名字：

Which is implemented in Class in explicit way, so it doesn't conflict with another member by its name:

public interface Class : Interface
{
    event MyEventHandler Interface.Event;

    public event AnotherEventHandler Event;
}

我试图将Class转换成c ++ / cli如下：

I am trying to convert Class into c++/cli as follows:

public ref class Class : public Interface
{
    virtual event MyEventHandler^ Event2 = Interface::Event
    {
    }

    ...
};

这不会编译给我在... = Interface :: Event部分的语法错误。有没有人知道什么是正确的语法，或者甚至存在于c ++ / cli？我花了一些时间在互联网上搜索，但没有碰到任何有用的。

This won't compile giving me syntax error in "... = Interface::Event" part. Does anyone have idea what is the right syntax, or does it even exist in c++/cli? I spent some time searching over the Internet, but failed to bump into anything useful.

更新：这里是完整的c ++ / cli代码，演示了问题：

UPDATE: Here is complete c++/cli code that demonstrates the problem:

public delegate void MyEventHandle();
public delegate void AnotherEventHandle();

public interface class Interface
{
    event MyEventHandler^ Event;
};

public ref class Class : public Interface
{
public:
    virtual event MyEventHandler^ Event2 = Interface::Event
    {
        virtual void add(MyEventHandle^) {}
        virtual void remove(MyEventHandle^) {}
    }

    event AnotherEventHandler^ Event;
};

VC ++ 2012输出的错误是error C2146：syntax error：missing;'before identifier' MyEventHandler'

The error output by VC++ 2012 is "error C2146: syntax error : missing ';' before identifier 'MyEventHandler'"

推荐答案

您必须使其看起来像这样：

You have to make it look like this:

event MyEventHandler^ Event2 {
    virtual void add(MyEventHandler^ handler) = Interface::Event::add {
        backingDelegate += handler;
    }
    virtual void remove(MyEventHandler^ handler) = Interface::Event::remove {
        backingDelegate -= handler;
    }
};

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