Using int64 on a lower bit data class

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James Best
James Best 2018-12-5
评论： James Best 2018-12-5
Using int64 to convert from a 32-bit to int64 data class, essentially adding 0 bytes to extend the class.
Apart from extra space being used, are there any other negatives to doing this? I would assume no resolution is lost as all the original data is still stored in the int64 class.

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Walter Roberson
Walter Roberson 2018-12-5
int64() of int32 data just sign extends
int64() of uint32 data just zero extends
uint64() of int32 data would result in 0 for any negative data because of saturation
uint64 of uint32 data would just 0 extend.

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