mess up with encoding.

encode.cpp

#include <iostream>
#include <locale>
#include <algorithm>

int main()
{
    wchar_t data[] = L"\u00b1\u03b1\U00024b62";       // { 0xb1 : 0x3b1 : 0xd852 : 0xdf62 : 0 } on windows, while { 0xb1, 0x3b1, 0x24b62, 0 } on linux
    //char16_t data[] = u"\u00b1\u03b1\U00024b62";      // works! actually saved as { 0xb1, 0x3b1, 0xd852, 0xdf62, 0 }
    //char32_t data[] = U"\u00b1\u03b1\U00024b62";      // works! as { 0xb1, 0x3b1, 0x24b62, 0 }

    std::cout << std::hex << std::showbase;

    for (const auto& c : data)
        std::cout << c << " : " << std::toupper(c, std::locale("")) << '\t';
    std::cout << '\n';


    const char utf16le[] = {'\xb1', '\x00', '\xb1', '\x03', '\x52', '\xd8', '\x62', '\xdf'};
    const char utf16be[] = {'\x00', '\xb1', '\x03', '\xb1', '\xd8', '\x52', '\xdf', '\x62'};
    const char ascii[] = {'\x61', '\x62', '\x63', '\x64', '\x65', '\x66', '\x67', '\x68'};

    std::wstring s;

    using char_T = char16_t;

    std::transform(
            reinterpret_cast<const char_T*>(utf16be),
            reinterpret_cast<const char_T*>(utf16be + sizeof(utf16be)),
            std::back_inserter(s),
            [](const char_T& c)
            {
                auto temp { c };
                temp = temp >> 8 | (temp & 0xff) << 8;
                return std::toupper(static_cast<wchar_t>(temp), std::locale(""));
            }
    );

    for (const auto& c : s)
        std::cout << c << '\n';
    std::cout << '\n';

}