Frequently used symbol “|” in Objective-C

Question

self.autoresizingMask = UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleWidth;

The source code is shown above. Wonder what the symbol \"|

Answer 1

The | character denotes an inclusive-or bitwise operation. which operates under the premise with matching the bitstrings of two objects.

if you have a bitstring 1101 and another 1001 the inclusive or of the two would produce 1011. Basically if the current bit is the same in both strings then a 1 is outputted in its place otherwise a 0 is.