[問題] 程式執行後會有access violation

[HeyScng ( )]

IDE: BCB

問題: 程式執行後會有access violation，
判斷應該是由於程式中CScenePoint tmp0(w,h)以及arr.push_back(tmp0)皆會執行解構子
因此我有另外對
CScenePoint& CScenePoint::operator=(const CScenePoint &)
進行overwrite，但沒有用...想請問各位，是否能給些提示告訴我應該加什麼。

謝謝! 程式碼如下:

//---------------------------------------------------------------------------
#include <vector>
#pragma hdrstop
using namespace std;
//---------------------------------------------------------------------------
#pragma argsused
//---------------------------------------------------------------------------
class CScenePoint
{
  public:
    CScenePoint(): m_width(0), m_height(0), m_bits(16), m_data(NULL) {};
    CScenePoint(int w, int h): m_bits(16)
    {
      m_width = w;
      m_height = h;
      m_data = (int*)malloc(sizeof(int)*m_width*m_width*m_bits);
    }

    ~CScenePoint()
    {
      if(m_data)  free(m_data);
      m_data = NULL;
    }

  private:
    int m_width, m_height, m_bits;
    int *m_data;
};
//---------------------------------------------------------------------------
int main(int argc, char* argv[])
{
  vector<CScenePoint> arr(1);
  int w = 1392, h = 1040;
  CScenePoint tmp0(w,h);
  arr.push_back(tmp0);
  return 0;
}
//---------------------------------------------------------------------------

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推 flamo:tmp0.m_data被free兩次囉
推 flamo:可考慮視情況用auto_ptr或shared_ptr
→ tinlans:當然沒有用，你還需要 "overload" copy constructor。
→ HeyScng:謝謝  加上copy constructor後果然OK了