#include <iostream>

#include <string>

#include <locale>

#include <codecvt>

using namespace std;

int main(int argc, const char *argv[])

{

string utf8 = u8"z\u6c34\U0001d10b";

// U+1d10b, musical sign segno, does not fit in UCS2

// but fit in UTF-16

// 1. to utf16

wstring_convert<codecvt_utf8_utf16<char16_t>, char16_t>utf16conv;

auto utf16 = utf16conv.from_bytes(utf8);

cout << "UTF16 conversion produced " << utf16.size()

<< " code points:\n";

for (char16_t c : utf16) cout << hex << showbase << c << '\n';

// 2. to ucs2

wstring_convert<codecvt_utf8<char16_t>, char16_t> ucs2conv;

try

{

u16string ucs2 = ucs2conv.from_bytes(utf8);

}

catch(range_error& e)

{

u16string ucs2 = ucs2conv.from_bytes(utf8.substr(0, ucs2conv.converted()));

cout << "UCS2 failed after producing " << dec << ucs2.size()

<< " characters:\n";

for (char16_t c : ucs2) cout << hex << showbase << c << '\n';

}

return 0;

}