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#include <iomanip>
#include <iostream>
#include <locale>
#include <string>
using namespace std;

locale::id codecvt<char32_t,char,mbstate_t>::id;

int main() {
    locale::global(locale("en_US.utf8"));
    // UTF-8 encoded string
    string data = u8"\uff26\uff21\uff23\uff34\uff2f\uff32\uff29\u2699";
    cout << "UTF-8:";
    for(auto c : data) {
        cout << " 0x" << uppercase << hex << setw(2) << setfill('0')
            << static_cast<int>(static_cast<uint8_t>(c));
    }
    cout << endl;
    // Conversion to wide string, not using C++17 depreciated functionality
    auto& facet = use_facet<codecvt<wchar_t,char,mbstate_t>>(locale());
    wstring wide(data.size(),'\0');
    mbstate_t state = {};
    const char* d_next;
    wchar_t* w_next;
    facet.in(state,
            &data[0], &data[data.size()], d_next,
            &wide[0], &wide[wide.size()], w_next);
    wide.resize(w_next - &wide[0]);
    cout << "Wide: ";
    for(auto c : wide)
        cout << " 0x" << uppercase << hex << setw(4) << setfill('0') << c;
    cout << endl;
    cout << "Lower:";
    for(auto c : wide)
        cout << " 0x" << uppercase << hex <<setw(4) << setfill('0')
            << tolower(c,locale());
    return 0;
}

Code: Select all

UTF-8: 0xEF 0xBC 0xA6 0xEF 0xBC 0xA1 0xEF 0xBC 0xA3 0xEF 0xBC 0xB4 0xEF 0xBC 0xAF 0xEF 0xBC 0xB2 0xEF 0xBC 0xA9 0xE2 0x9A 0x99
Wide:  0xFF26 0xFF21 0xFF23 0xFF34 0xFF2F 0xFF32 0xFF29 0x2699
Lower: 0xFF46 0xFF41 0xFF43 0xFF54 0xFF4F 0xFF52 0xFF49 0x2699