我嘗試使用SWIG擴(kuò)展Matrix類以創(chuàng)建python接口。我使用了官方的Docu碼。但是我得到了一個(gè)完全荒謬的錯(cuò)誤消息。在聲明我的行類的地方似乎并不重要。我總是在編譯時(shí)收到此錯(cuò)誤。SWIG有什么問(wèn)題？錯(cuò)誤：  ANPyNetCPUPYTHON_wrap.cxx: In function ‘ANN::F2DArray ANN_F2DArray___getitem__(ANN::F2DArray*, int)’:  ANPyNetCPUPYTHON_wrap.cxx:5192: error: ‘Grid2dRow’ was not declared in this scope  ANPyNetCPUPYTHON_wrap.cxx:5192: error: expected `;' before ‘r’  ANPyNetCPUPYTHON_wrap.cxx:5193: error: ‘r’ was not declared in this scope代碼：  %{  #include <AN2DArray.h>  %}  %include <AN2DArray.h>    %inline %{      struct Grid2dRow {          ANN::F2DArray *g;   // Grid          int    y;      // Row number          // These functions are used by Python to access sequence types (lists, tuples, ...)          float __getitem__(int x) {              return g->GetValue(x, y);          }          void __setitem__(int x, float val) {              g->SetValue(x, y, val);          }      };  %}  %extend ANN::F2DArray   {      ANN::F2DArray __getitem__(int y) {          Grid2dRow r;          r.g = self;          r.y = y;          return r;      }  };