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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../../cpp/string/wide/wcslen.html below:

std::wcslen - cppreference.com

Returns the length of a wide string, that is the number of non-null wide characters that precede the terminating null wide character.

The behavior is undefined if there is no null character in the wide character array pointed to by str.

The length of the null-terminated wide string str.

std::size_t wcslen(const wchar_t* start)
{
    // NB: start is not checked for nullptr!
    const wchar_t* end = start;
    while (*end != L'\0')
        ++end;
    return end - start;
}

#include <iostream>
#include <cwchar>
int main()
{
    const wchar_t* str = L"Hello, world!";
    std::wcout << "The length of L\"" << str << "\" is " << std::wcslen(str) << '\n';
}

Output:

The length of L"Hello, world!" is 13

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