How can I append data to a std::string in hex format?

Question

I have an existing std::string and an int. I\'d like to concatenate the ASCII (string literal) hexadecimal representation of the integer to the

Answer 1

Building on xtofl's answer, the header you're looking for is <iomanip>. This is where std::hex, std::dec, and std::oct live, all of which can be directed into streams such that whatever gets sent into the stream after them is converted to that base.

Answer 2

I believe 'string' only forward declares std::stringstream. So you also need to include:

#include <sstream>

Answer 3

Use a stringstream. You can use it as any other output stream, so you can equally insert std::hex into it. Then extract it's stringstream::str() function.

std::stringstream ss;
ss << "your id is " << std::hex << 0x0daffa0;
const std::string s = ss.str();