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32 bit windows -> 64 bit windows -> problems?

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I''ve been reading on this 64 bit windows stuff, and when you have 64 bits then some data types'' sizes change right? wont this not allow stuff developed in 32 bit windows run on 64 bit windows? All pointers are going to be 64 bits in a 64 bit environment, and wills ints also become 64 bits? are these forseeable problems? or am i just being paranoid? How bout longs? i do a lot of bit manipulation with the assumption that a long will be 32 bits? if it becomes 64 bits, then the bit manipulation will all be invalid? any input on this matter?
:::Al:::
[Triple Buffer V2.0] - Resource leak imminent. Memory status: Fragile

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There will always be 32-bit datatypes around, even if your O/S, computer or compiler is 64-bits or 1024-bits, just as there are 16-bit ints and 8-bit chars. I shouldn''t get too concerned!

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