自参照类型 [英] Self referential type

问题描述

什么类型T使下列代码可编译？

What type T makes the following code compilable?

T f(){ return &f; }

我更喜欢C答案，但我将问题标记为C和C ++，

I'd prefer a C answer, but I marked the question as C and C++ in case there is only an answer using templates.

推荐答案

我希望这不是作弊（仅限C ++）：

I hope this isn't cheating (C++ only):

class T {
private:
    T (*_func)();

public:
    T(T (*func)()) : _func(func) {}

    T operator()() {
        return *this;
    }
};

T f() { return &f; }

int main() {
    f()()()()()()()();
}

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