C++ string conversion UTF8 <-> UTF16

cpp_utf8_utf16.cpp

#include <string> 
#include <locale> 
#include <codecvt> 
 
//UTF-8 to UTF-16 
std::string source; 
//... 
std::wstring_convert<std::codecvt_utf8_utf16<char16_t>,char16_t> convert; 
std::u16string dest = convert.from_bytes(source);     
 
//UTF-16 to UTF-8 
std::u16string source; 
//... 
std::wstring_convert<std::codecvt_utf8_utf16<char16_t>,char16_t> convert; 
std::string dest = convert.to_bytes(source);     

thank you a lot,
im tryna convert wstring(utf16) <=> string(utf8), so i did a small fixes on your code.
here is it

// string (utf8) -> u16string -> wstring
wstring utf8_to_utf16(const string& utf8)
{
    wstring_convert<codecvt_utf8_utf16<char16_t>,char16_t> convert; 
    u16string utf16 = convert.from_bytes(utf8);
    wstring wstr(utf16.begin(), utf16.end());
    return wstr;
}
// wstring -> u16string -> string (utf8)
string utf16_to_utf8(const wstring& utf16) {
    u16string u16str(utf16.begin(), utf16.end());
    wstring_convert<codecvt_utf8_utf16<char16_t>,char16_t> convert; 
    string utf8 = convert.to_bytes(u16str);
    return utf8;
}

codecvt_utf8* with wstring_convert deprecated in C++17, removed in C++26

wstring(wchar_t) is utf-32 on linux.

It's in the standard library of cpp