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

From:
phoenix8848@gmail.com
Newsgroups:
microsoft.public.vc.stl
Date:
Fri, 29 Feb 2008 18:24:35 -0800 (PST)
Message-ID:
<e35d3d47-bf16-4445-9aec-17e7fa67d342@s12g2000prg.googlegroups.com>
On Mar 1, 7:47 am, "Giovanni Dicanio" <giovanni.dica...@invalid.com>
wrote:

<phoenix8...@gmail.com> ha scritto nel messaggionews:afbb2802-ccee-46e7-8f=

9e-f2bea29a83a9@h11g2000prf.googlegroups.com...

 bool InsertCell(int nSign, CDataCell& objNewCell);


I would use a const reference, like this:

  bool InsertCell( int nSign, const CDataCell & objNewCell )

{
 std::pair<std::map<int, CDataCell>::iterator, bool> ret =
   m_mapCellCollection.insert(std::map<int,
CDataCell>::value_type(nSign, objNewCell); //throw an error said
"0x000005, Access violent"


I don't like this long type declarations, IMHO they are not very readable.=

I would prefer using typedef's to make things simpler and more readable,
like this:

class CADTNode
{
private:
...

    // *** Map typedef ***
    typedef std::map< int, CDataCell > CellMapCollection;
    CellMapCollection m_mapCellCollection;
...

bool CADTNode::Insert( int nSign, const CDataCell & objNewCell )
{
     // *** Pair Typedef ***
     typedef std::pair< int, CDataCell > CellMapPair;

     // Insert into Map
     m_mapCellCollection.insert( CellMapPair( nSign, objNewCell ) );=

     ...
 }

Giovanni


Thanks a lot! i fount the reason.

//=======CADTTree====
Class CADTTree
{
private:
CADTNode* pRootNode; //No malloc!!!!
...
}

How foolish i am!

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