Function XGDMatrixGetInfoRef

src/c_api/c_api.cc:845–860

}

XGB_DLL int XGDMatrixGetInfoRef(DMatrixHandle handle, char const *field, char const **out_array) {
  API_BEGIN();
  CHECK_HANDLE();
  xgboost_CHECK_C_ARG_PTR(field);
  xgboost_CHECK_C_ARG_PTR(out_array);

  auto p_fmat = CastDMatrixHandle(handle);
  MetaInfo const &info = p_fmat->Info();
  auto aif = info.GetInfo(p_fmat->Ctx(), StringView{field});

  auto &res = p_fmat->GetThreadLocal().ret_str;
  res = aif.ArrayInterfaceStr();
  *out_array = res.c_str();

  API_END();
}

namespace {
template <typename T>