converting between various strings in c++

misc  c++ 
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#include <codecvt>
#include <locale>
#include <string>


static std::string toU8String(const std::u16string& u16str)
{
    std::wstring_converter<std::codecvt_utf8_utf16<char16_t>, char16_t> converter;
    return converter.to_bytes();
}


static std::u16string toU16String(const std:: string& u16str)
{
    std::wstring_converter<std::codecvt_utf8_utf16<char16_t>, char16_t> converter;
    return converter.from_bytes();
}

misc  c++