C++ converting vector to 2 hex and then store it in a string -

i have been using c pretty new c++. want convert int vector (std::vector) hexadecimal representation , store string. found use in c in following thread: converting hex string using 'sprintf'

the code proposed user411313 following:

static unsigned char  digest[16]; static unsigned char hex_tmp[16];  (i = 0; < 16; i++) {   printf("%02x",digest[i]);     sprintf(&hex_tmp[i], "%02x", digest[i]);   } 

one of concerns go out of index @ point since sprintf may try add 0 after content. also, wondering if there way native c++, perhaps built function used instead of c functions. preferable in c++ on c functions? thank assistance!

if there way native c++, perhaps built function used instead of c functions. preferable in c++ on c functions?

sure there way, , yes it's preferable:

static std::array<unsigned char,16> digest; static std::string hex_tmp;  (auto x : digest) {     std::ostringstream oss;     oss << std::hex << std::setw(2) << std::setfill('0') << (unsigned)x;     hex_tmp += oss.str(); } 

one of concerns go out of index @ point since sprintf may try add 0 after content.

that's valid concern. classes used in code snippet above overcome these issues, , don't need care about.