utils.hpp

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#ifndef PACEMAKER_INCA_DETAIL_UTILS_HPP_
#define PACEMAKER_INCA_DETAIL_UTILS_HPP_
 
#include <stdexcept>
#include <typeinfo>
 
#include <comdef.h>
 
#include "pacemaker/inca/detail/unique_com_ptr.hpp"
 
namespace pacemaker::inca::detail
{
  template<class T>
  [[nodiscard]] auto query_interface(pacemaker::inca::detail::unique_com_ptr<::IDispatch> src) -> pacemaker::inca::detail::unique_com_ptr<T>
  {
    if (src == nullptr)
      throw std::invalid_argument("Attempt on calling QueryInterface on nullptr");
 
    T      *out{nullptr};
    HRESULT hr = src->QueryInterface(__uuidof(T::type), reinterpret_cast<void **>(&out));
 
    if (FAILED(hr))
      throw std::runtime_error(
          std::string("QueryInterface failed for ") + typeid(T).name());
 
    return pacemaker::inca::detail::unique_com_ptr<T>(out);
  }
} // namespace pacemaker::inca::detail
 
#endif // PACEMAKER_INCA_DETAIL_UTILS_HPP_