模板继承语法 [英] Template inheritance syntax

问题描述

我一直在玩C ++中的模板继承语法.我提出了以下内容，但不确定为什么会出现以下编译错误?

Hi,

I have been toying with template inheritance syntax in C++. I came up with the below but am unsure why I am getting the below compile error?

class myOutput
{
	public:
		void print()
		{
			std::cout << "hi from output\n";
		}

	

};
template<class Output> class Svc
{
	
};

class SvcPrint : public Svc<class myOutput>
{
	 public:
		void print()
		{
                         
			// call the print function in myOutput
			myOutput.print(); // SYNTAX ERROR !
		}                         // error C2143: syntax error :  missing  '';'' before ''.''
};

我发表了我希望做的目标的评论.这不是一个实际的设计，只是玩弄语法.

这是在VS 2008上编译的.

感谢您提供任何信息.

I put in comments my objective of what I wish to do. This is not an actual design, just playing around with the syntax.

This was compiled on VS 2008.

Thanks for any information.

推荐答案

哦，我知道，我应该已经创建了对象的本地实例，就像这样...

Oh I see, I should have created a local instance of the object like this...

<pre lang="cs">class SvcPrint : public Svc<class myOutput><br />
{<br />
     public:<br />
        void print()<br />
        {<br />
            // call the print function in myOutput<br />
            //myOutput.print();<br />
            myOutput localObject;<br />
            localObject.print();<br />
        }<br />
};</pre><br />

现在可以了，因为myOutput引用了一个类型！

我可以这样使用它

Now its ok since the myOutput refers to a type!

And I can use it like this

int main()
{
   
   SvcPrint a;
   a.print();
    return 0;
}

很好！

Nice!

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