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lang-cpp
sizeofwould be calculated at compile time and then hard-coded in the executable"? I used to think so, but now I am not able to explain how this works. b) Also, by "not valid" so you mean that it will not run at all or only that the executable will report wrong results?#define BIT_SIZE(T) (sizeof(T) * CHAR_BIT)can be used as a template parameter for a bitset, such asstd::bitset<BIT_SIZE(int)>, while it's determined at run time for C99's variable-length arrays.std::bitset<BIT_SIZE(someVar)>(someVar), if creating the bitset from a pre-existing variable.