一种简单的方法是定义表示函数的单个接口类型：

A simpler approach would be to define a single interface type representing a function:

struct ICallback
{
  virtual bool operator()() const = 0;
};

并根据需要实施多次：

struct Foo : ICallback
{
  virtual bool operator()() const { return true;}
};

struct Bar : ICallback
{
  virtual bool operator()() const { return false;}
};

然后您的总线实现可以使用回调接口：

then your bus implementation can take callback interfaces:

class BusImplemantation{
public:
    void addRequest(const ICallback* callback) { .... }
};

然后

BusImplemantation bus;
Foo foo;  // can be called: bool b = foo();
Bar bar;   // can be called: bool b = bar();

bus.addRequest(&foo);          
bus.addRequest(&bar);

您也可以使用 std :: function 并完全避免使用通用界面。

You could also investigate using std::function and avoiding the common interface altogether.