Unsigned integer as UTF-8 value

Question

assuming that I have

uint32_t a(3084);

I would like to create a string that stores the unicode character U+3084 which means that I

Answer 1

std::string_convert::to_bytes has a single-char overload just for you.

#include 
#include 
#include 
#include 
#include 

// utility function for output
void hex_print(const std::string& s)
{
    std::cout << std::hex << std::setfill('0');
    for(unsigned char c : s)
        std::cout << std::setw(2) << static_cast(c) << ' ';
    std::cout << std::dec << '\n';
}

int main()
{
    uint32_t a(3084);

    std::wstring_convert, char32_t> conv1;
    std::string u8str = conv1.to_bytes(a);
    std::cout << "UTF-8 conversion produced " << u8str.size() << " bytes:\n";
    hex_print(u8str);
}

I get (with libc++)

$ ./test
UTF-8 conversion produced 3 bytes:
e0 b0 8c