# std::wmemset

From cppreference.com
< cpp‎ | string‎ | wide

Defined in header `<cwchar>` |  |
wchar_t* wmemset( wchar_t* dest, wchar_t ch, std::size_t count ); |  |

Copies the wide character ch into each of the first count wide characters of the wide character array pointed to by dest.

If overflow occurs, the behavior is undefined.

If count is zero, the function does nothing.

### Parameters

dest | - | pointer to the wide character array to fill
ch | - | fill wide character
count | - | number of wide characters to fill

### Return value

Returns a copy of dest.

### 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.

### Example

Run this code

    #include <clocale>
    #include <cwchar>
    #include <iostream>
    #include <locale>

    int main()
    {
        wchar_t ar[4] = {L'1', L'2', L'3', L'4'};
        std::wmemset(ar, L'\U0001f34c', 2); // replaces [12] with the 🍌 bananas
        std::wmemset(ar + 2, L'蕉', 2); // replaces [34] with the 蕉 bananas

        std::setlocale(LC_ALL, "en_US.utf8");
        std::wcout.imbue(std::locale("en_US.utf8"));
        std::wcout << std::wstring(ar, 4) << '\n';
    }

Possible output:

    🍌🍌蕉蕉

### See also

memset | fills a buffer with a character (function)
wmemcpy | copies a certain amount of wide characters between two non-overlapping arrays (function)
fill_n | copy-assigns the given value to N elements in a range (function template)

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