In a structure, is it legal to use one array field to access another one? – stackoverflow.com

In a structure, is it legal to use one array field to access another one? – stackoverflow.com

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As an example, consider the following structure: struct S { int a[4]; int b[4]; } s; Would it be legal to write s.a[6] and expect it to be equal to s.b[2]? Personally, I feel that it must be UB ...

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