How to memset an array of bools?

Question

void *memset(void *dest, int c, size_t count)

The 3rd argument is the Number of characters or bytes in the array. How would you memset an array of booleans, say bool bArray[11]?

MSDN says: "Security Note - Make sure that the destination buffer has enough room for at least count characters."

Answer 1

std::fill() should use memset() when possible.

std::fill(std::begin(bArray), std::end(bArray), value);

If bArray is a pointer, then the following should be used:

std::fill(bArray, bArray + arraySize, value);

Answer 2

memset(buffer_start, value, sizeof(bool) * number_of_bools);

Answer 3

//Array declaration
bool arr[10];

//To initialize all the elements to true

memset(arr,1,sizeof(arr));

Similarly, you can initialize all the elements to false, by replacing 1 with 0.

Answer 4

memset sets memory in multiples of bytes. So, the only way is to add padding to your bool pointer such that its length is a multiple of 8. Then do memset. Personally I would prefer if there were any other alternative than putting a redundant padding. But I haven't found any alternative solution to date.

Answer 5

Simply like this example:

    bool primes[MAX];
    memset(primes,true,sizeof(bool) * MAX);

Answer 6

To set array of 11 bool elements to eg true by using memset :

const int N = 11;
bool arr[N];
memset(arr, 1, sizeof(bool) * N);