Re: Why "Access Violent" throw when insert pair object into std::map

"Doug Harrison [MVP]" <>
Sun, 02 Mar 2008 18:38:13 -0600
On Fri, 29 Feb 2008 08:41:16 -0800 (PST), wrote:

i met this problem:

//=====head file====
#include <map>
Class CDataCell{...};
Class CADTNode
 std::map<int, CDataCell> m_mapCellCollection;

 bool InsertCell(int nSign, CDataCell& objNewCell);

//=====source file=====
bool CADTNode::Insert(int nSign, CDataCell& objNewCell)
 std::pair<std::map<int, CDataCell>::iterator, bool> ret =
CDataCell>::value_type(nSign, objNewCell); //throw an error said
"0x000005, Access violent"

Debug with F11 found where throw this exception:


template <class _Key, class _Value, class _KeyOfValue,
         class _Compare, class _Alloc> __iterator__
_Rb_tree<_Key,_Value,_KeyOfValue,_Compare,_Alloc> ::insert_equal(const
_Value& __v)
 _Link_type __y = this->_M_header._M_data;
 _Link_type __x = _M_root(); //THROW THE EXCEPTION
 while (__x != 0) {
   __y = __x;
   __x = _M_key_compare(_KeyOfValue()(__v), _S_key(__x)) ?
           _S_left(__x) : _S_right(__x);
 return _M_insert(__x, __y, __v);

my os is Win2003Enterprise
my develop environment is VC++6.0 SP6 + stlport(version unknown -_-!)

i have little known about stlport and pls help me.

thanks a lot!

What does _M_root do? If this is happening across DLLs, and STLport uses
static data in the template, it isn't going to work without explicitly
instantiating and exporting the specializations you use. (If you don't do
this, you get duplicated static data in each module instead of one copy for
the whole program.)

Doug Harrison
Visual C++ MVP

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