std:: wmemmove

From cppreference.com
C++
Strings library
Null-terminated wide strings
Defined in header <cwchar>
wchar_t * wmemmove ( wchar_t * dest, const wchar_t * src, std:: size_t count ) ;

Copies exactly count successive wide characters from the wide character array pointed to by src to the wide character array pointed to by dest .

If count is zero, the function does nothing.

The arrays may overlap: copying takes place as if the wide characters were copied to a temporary wide character array and then copied from the temporary array to dest .

Parameters

dest - pointer to the wide character array to copy to
src - pointer to the wide character array to copy from
count - number of wide characters to copy

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 copies: nulls as well as invalid characters are copied too.

Example

Run this code 
#include <clocale>
#include <cwchar>
#include <iostream>
#include <locale>
 
int main()
{
    std::setlocale(LC_ALL, "en_US.utf8");
    std::wcout.imbue(std::locale("en_US.utf8"));
 
    wchar_t str[] = L"αβγδεζηθικλμνξοπρστυφχψω";
    std::wcout << str << '\n';
    std::wmemmove(str + 4, str + 3, 3); // copy from [δεζ] to [εζη]
    std::wcout << str << '\n';
}

Possible output: 

αβγδεζηθικλμνξοπρστυφχψω
αβγδδεζθικλμνξοπρστυφχψω

See also

copies a certain amount of wide characters between two non-overlapping arrays
(function)
moves one buffer to another
(function)
(C++11)
copies a range of elements to a new location
(function template)
copies a range of elements in backwards order
(function template)
C documentation for wmemmove
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