delegate_response.h

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#ifndef API_MIP_DELEGATE_RESPONSE
#define API_MIP_DELEGATE_RESPONSE
 
#include <memory>
 
#include "mip/error.h"
#include "mip/mip_namespace.h"
 
MIP_NAMESPACE_BEGIN
 
class DelegateResponseBase {
protected:
  DelegateResponseBase() : mReserved(0) {}
  // For internal purpose only
  long mReserved;
  static long GetReserved(const DelegateResponseBase& response) {
    return response.mReserved;
  }
};
 
template <class T> class DelegateResponse : public DelegateResponseBase {
public:
  DelegateResponse(std::shared_ptr<T> data) : mData(data), mDelegateResponseError(nullptr) {
    if (!mData) {
      throw std::invalid_argument("Created an empty DelegateResponse");
    }
  }
 
  DelegateResponse(mip::Error& error) : mData(nullptr), mDelegateResponseError(new DelegateResponseError(error)) {
    if (mDelegateResponseError->GetMessage().empty()) {
      throw std::invalid_argument("Created an empty DelegateResponse");
    }
  }
 
  explicit DelegateResponse(const std::exception_ptr& exception)
      : mData(nullptr),
        mDelegateResponseError(exception ? new DelegateResponseError(exception) : nullptr) {
    if (!mDelegateResponseError) {
      throw std::invalid_argument("Created an empty DelegateResponse");
    }
  }
  
  std::shared_ptr<T> GetData() const { return mData; }
 
  std::shared_ptr<mip::DelegateResponseError> GetError() const {
    return mDelegateResponseError;
  }
 
  virtual ~DelegateResponse() {}
protected:
  DelegateResponse() {}
private:
  std::shared_ptr<T> mData;
  std::shared_ptr<mip::DelegateResponseError> mDelegateResponseError;
};
 
MIP_NAMESPACE_END
 
#endif // API_MIP_DELEGATE_RESPONSE