我有一個非模板抽象基類,用於爲了能夠引用基類型,因爲未專用的模板類型不能用作方法參數。C++ HowTo:從抽象專用模板繼承的非模板類
#ifndef RPCPP_ICALLBACKBASE_H
#define RPCPP_ICALLBACKBASE_H
#include <string>
namespace rpcpp
{
class ICallbackBase
{
public:
virtual ~ICallbackBase() {};
virtual void OnSuccess(void result) = 0;
virtual void OnError(std::string error) = 0;
};
}
#endif // RPCPP_ICALLBACKBASE_H
抽象模板類ICallback繼承ICallback鹼,像這樣:
#ifndef RPCPP_ICALLBACK_H
#define RPCPP_ICALLBACK_H
#include "ICallbackBase.h"
namespace rpcpp
{
template <class T>
class ICallback : public ICallbackBase
{
public:
virtual ~ICallback() {};
virtual void OnSuccess(T result) = 0;
virtual void OnError(std::string error) = 0;
};
}
#endif // RPCPP_ICALLBACK_H
最後,可以通過從ICallback繼承創建一個具體類型:
#ifndef RPCPP_SAMPLE_CALLBACK_H
#define RPCPP_SAMPLE_CALLBACK_H
#include "ICallback.h"
#include <iostream>
namespace rpcpp
{
class SampleCallback : public ICallback<double>
{
public:
~SampleCallback() {};
virtual void OnSuccess(double result)
{
std::cout << "Successfully executed a remote procedure, A + B = " << result << "\r\n\r\n";
}
virtual void OnError(std::string error)
{
std::cout << "Error while executing a remote procedure: " << error << "\r\n\r\n";
}
};
}
#endif // RPCPP_SAMPLE_CALLBACK_H
所有這些都編譯好,但是當我嘗試使用這個,像這樣:
rpcpp::SampleCallback sc;
sic.CalculateMean(15, 28, &sc); // Third argument of this method is expected to be ICallbackBase&.
它產生以下兩個錯誤:
「can not instantiate abstract class」in line#1。 符合#2
「不能從SampleCallback &轉換參數3 ICallbackBase &」我在做什麼錯?
你說這需要一個參考,但你傳遞一個指針。 – 2012-03-11 17:26:05