与操作员的功能模板 [英] Function template with an operator

问题描述

在C ++中，你能在类上有一个模板操作符吗？像这样：

In C++, can you have a templated operator on a class? Like so:

class MyClass {
public:
    template<class T>
    T operator()() { /* return some T */ };
}

这实际上似乎编译很好，但混乱是如何使用它：

This actually seems to compile just fine, but the confusion comes in how one would use it:

MyClass c;
int i = c<int>(); // This doesn't work
int i = (int)c(); // Neither does this*

它编译的事实告诉我它是可行的，我只是在损失如何使用它！

The fact that it compiles at all suggests to me that it's doable, I'm just at a loss for how to use it! Any suggestions, or is this method of use a non-starter?

推荐答案

您需要指定 T 。

int i = c.operator()<int>();

不幸的是，在这种情况下不能直接使用函数调用语法。

Unfortunately, you can't use the function call syntax directly in this case.

编辑：哦，你在类定义的开头缺少 public：。

Oh, and you're missing public: at the beginning of the class definition.

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