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Showing content from https://en.cppreference.com/w/cpp/algorithm/../algorithm/../../cpp/../c/string/wide/wmemset.html below:

wmemset - cppreference.com

wchar_t* wmemset( wchar_t* dest, wchar_t ch, size_t count ); (since C95)

Copies the wide character ch into each of the first count wide characters of the wide character array (or integer array of compatible type) pointed to by dest.

If overflow occurs, the behavior is undefined.

If count is zero, the function does nothing.

[edit] Parameters dest - pointer to the wide character array to fill ch - fill wide character count - number of wide characters to fill [edit] Return value

Returns a copy of dest

[edit] Notes

This function is not locale-sensitive and pays no attention to the values of the wchar_t objects it writes: nulls as well as invalid wide characters are written too.

[edit] Example 
#include <locale.h>
#include <stdio.h>
#include <wchar.h>
 
int main(void)
{
    wchar_t ar[10] = L"1234567890"; // no trailing null in the array
    wmemset(ar, L'\U0001f34c', 5); // replaces [12345] with the 🍌 bananas
    wmemset(ar + 5, L'蕉', 5); // replaces [67890] with the 蕉 bananas
 
    setlocale(LC_ALL, "en_US.utf8");
    for (size_t n = 0; n < sizeof ar / sizeof *ar; ++n)
        putwchar(ar[n]);
    putwchar(L'\n');
}

Output:

🍌🍌🍌🍌🍌蕉蕉蕉蕉蕉
[edit] References
[edit] See also

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