Re: CArray of stdext::hash_map<int,int> not possible ( access violation ) ?

"Stephan T. Lavavej [MSFT]" <>
Wed, 10 Mar 2010 15:09:28 -0800
CArray memcpys its elements and is therefore incompatible with non-PODs (POD
= Plain Old Data) such as all STL containers. This particular code doesn't
crash with VC10, but a trivial modification does crash:

C:\Temp>type meow.cpp
#include <afxtempl.h>
#include <hash_map>

int main() {
    typedef stdext::hash_map<int, int> MAP;

    CArray<MAP> test;
    MAP item;
    test[0][111] = 222;
    test[0][333] = 444;
    test[1][555] = 666;
    test[1][777] = 888;


C:\Temp>cl /EHsc /nologo /W4 /MTd meow.cpp
_WIN32_WINNT not defined. Defaulting to _WIN32_WINNT_MAXVER (see


Please don't modify _ITERATOR_DEBUG_LEVEL (formerly
_HAS_ITERATOR_DEBUGGING/_SECURE_SCL) without knowing exactly what you're
doing. That's like silencing compiler warnings without understanding them.

Because the STL works with non-PODs, STL containers can hold ATL/MFC
objects. (They just need to be copyable and assignable - only overloaded
op&() presents problems.)

(CArray also has a terrible growth policy.)

Stephan T. Lavavej
Visual C++ Libraries Developer

"Giovanni Dicanio" <> wrote in message

"Giovanni Dicanio" <> ha scritto nel
messaggio news:#$kXYmGwKHA.5940@TK2MSFTNGP02.phx.gbl...

I'll let you know if I have some more information...

A small update: I've just tried in VS2010 RC, and the code runs fine (no
access violation).


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