c++ - 什么是

Question

I am looking at the node.js documentation for making a module. http://nodejs.org/api/addons.html

I understand template functions and template classes such as

template <class T>
void MyTemplateFunction(T a) 
{
    a.doSomething();
}

...

MyObj mo;
MyTemplateFunction <MyObj>(mo);

This code looks a little but like a template but I have never it before:

void init(Handle<Object> exports) {
    // what is <Object>?
}

score 3 · Accepted Answer

Presumably, Handle is a class template with a single type parameter:

template <typename T> class Handle;

and presumably Object is a type.

This instantiates the Handle class template, using Object as the template argument, to give a class; just as your example instantiates the MyTemplateFunction function template, using MyObj as the template argument, to give a function.

score 2 · Accepted Answer

Handle<Object>是模板类的规范（与上面显示的模板函数相反）。有一个声明

template <class T>
class Handle {
    ...
};

在您的代码或您包含的某个头文件中的某个位置。本质上，Handle<Object>是一个使用模板生成的类，通过Handle替换整个模板的代码。TObject

score 1 · Accepted Answer

It's basically the same thing: exports is declared to be of type Handle<Object>, with Handle being a class template taking one (most likely) type argument. It's probably declared similar to the following:

template<typename T>
class Handle{...};

3 回答 3

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