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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../ranges/../string/wide/wcscpy.html below:

std::wcscpy - cppreference.com

wchar_t* wcscpy( wchar_t* dest, const wchar_t* src );

Copies the wide string pointed to by src (including the terminating null wide character) to wide character array pointed to by dest.

If the strings overlap, the behavior is undefined.

[edit] Parameters dest - pointer to the wide character array to copy to src - pointer to the null-terminated wide string to copy from [edit] Return value

dest

[edit] Example 
#include <clocale>
#include <cwchar>
#include <iostream>
#include <memory>
 
int main()
{
    const wchar_t* src = L"犬 means dog";
//  src[0] = L'狗'; // can't modify string literal
    auto dst = std::make_unique<wchar_t[]>(std::wcslen(src) + 1); // +1 for the null
    std::wcscpy(dst.get(), src);
    dst[0] = L'狗';
    std::setlocale(LC_ALL, "en_US.utf8");
    std::wcout.imbue(std::locale(""));
    std::wcout << src << '\n' << dst.get() << '\n';
}

Output:

犬 means dog
狗 means dog
[edit] See also copies a certain amount of wide characters from one string to another
(function) [edit] copies a certain amount of wide characters between two non-overlapping arrays
(function) [edit] copies one string to another
(function) [edit]

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