Jens Gustedt's Blog

October 23, 2010

A generic swap implementation

Filed under: C99, integers, preprocessor — Jens Gustedt @ 11:13

Swapping the contents of two variable is an elementary task that is often met in daily programming. There are two generic strategies to do that for general types.
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October 18, 2010

Detecting integer overflow II

Filed under: C99, integers — Jens Gustedt @ 22:21

In an earlier post we came up with a general solution to check for potential under- or overflow in an integer addition. On most modern architectures this can be done more efficiently, even when assuming that there are no special instructions that capture overflow bits or such.
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October 16, 2010

Detecting integer overflow I

Filed under: C99, integers — Jens Gustedt @ 10:15

A recent discussion on stackoverflow has shown that detecting integer overflow without provoking undefined behavior need some reflection, and that the quick answers are not necessarily the best ones.
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