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'pre-initialized' values

Started by osh Jun 30, 2004 at 2:45 AM 1 reply 300+ views

Original Post

Jun 30, 2004 at 2:45 AM

Hi! Imagine you have a class with few variables. When you call a constructor, these variable are pre-initialized with some values (bool - 204, ptr to anything - 0xcdcdcdcd). I'd like to know, if these values are random, or compiler dependent or what? I need to know whether I can say - in cross-platform project - that uninitialized variable have such and such value. Cheers Andrew

SiCrane

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SiCrane

Jun 30, 2004 at 2:51 AM

Compiler dependent, and compile flag dependent. You're probably using MSVC. MSVC in debug mode will set certain bit patterns for uninitialized and freed memory. In release mode it doesn't do it. I don't think gcc does anything like it. Borland compilers might, but it's been a while since I've used any of them.

Nemesis2k2

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Nemesis2k2

Jun 30, 2004 at 2:52 AM

Those values are only written there when you're compiling a program in debug more. They're written by the memory manager, and they are compiler dependant. In release mode, those values could be anything.

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