NAME¶

std::wmemset - std::wmemset

Synopsis¶

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)
copies a certain amount of wide characters between two non-overlapping
wmemcpy arrays
(function)
fill_n copy-assigns the given value to N elements in a range
(function template)
C documentation for
wmemset