Debug builds

[Matthias]

Hi,

I have just read in another thread (didn't want to hijack it) that STL 
containers may operate more safe in "debug builds". Are we talking about 
a debug build when the _DEBUG flag is set (on gcc)? I have grep'ed for 
_DEBUG in all files of my STL implementation but couldn't come up with 
anything.
How do I enable the STL to work in debug mode?

I am using the GNU C++ implementation, gcc 3.4.3.

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Regards,
Matthias