問(wèn)題描述

我最近一直在做一個(gè)小項(xiàng)目，但我想不出什么..

I've been working lately on a small project, and I couldn't figure out something..

我得到了一個(gè)包含類的 .h 文件，使用了 typename 模板.在那個(gè)班級(jí)里面有一個(gè)私人班級(jí).

I've been given a .h file that was containing a class, using a typename template. Inside that class there was a private class.

template <typename T>
class Something
{
public:
        Something();
        ~Something();

        Node* Function1(int index);
        int Index(const T& id);


private:
        class Node()
        {
                public:
                T id;

                //Imagine the rest for the Node


        };      
};

當(dāng)我想定義Something"類的函數(shù)時(shí)出現(xiàn)問(wèn)題

The problem occured when I wanted to define the functions of the class "Something"

這是我的做法(在 .inl 文件中)

Here's how I was doing it (in a .inl file)

template<typename T>
Node* Something::Function1(int index) //Is the return type well written?
{
        // returns the node at the specified index
}

template<typename T>
int Something::Index(const T& id) //Is the parameter type well specified?
{
        // returns the index of the node with the specified id
}

所以問(wèn)題部分是在定義部分......我是否必須告訴編譯器返回類型(在這種情況下 Node*)使用 typename 模板(像這樣:typename Node*) ?那么參數(shù)呢?typename const Node& ?

So the bugging part was in the definitions part... Do I have to tell the compiler that the return type (in this case Node*) uses the typename template (like this: typename Node*) ? And what about the parameter ? typename const Node& ?

所以基本上，我什么時(shí)候必須指定函數(shù)/參數(shù)是否使用模板?

So basically, when do I have to specify wether the function/parameter uses a template?

感謝您的時(shí)間.

推薦答案

template<typename T>
typename Something<T>::Node * Something::Function1(int index) //Is the return type well written?
{
        // returns the node at the specified index
}

這篇關(guān)于我什么時(shí)候應(yīng)該使用關(guān)鍵字“typename"?使用模板時(shí)的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，也希望大家多多支持html5模板網(wǎng)！