打印boost :: array <>到标准输出

Question

I have a boost::array declared as below

typedef boost::array<unsigned char, 4096> m_array_type;
m_array_type m_recv_buf;

I want to output m_recv_buf to stdout .

std::cout << m_recv_buf << std::endl;

doesn't seem to work? How do I print this to stdout

Answer 1

Use ostream.write :

std::cout.write(&m_recv_buf[0], len);

Also, you specified the C++11 tag. Consider using std::array, which is now standard.

Answer 2

If you want to print your m_array_type as a string, you'll need the string to properly end with a null terminator. So this approach creates a std::string type, explicitly sending the length to the std::string constructor.

std::cout << std::string(reinterpret_cast<const char*>(m_recv_buf.data()), m_recv_buf.size()) << std::endl;

I think this way would be clear to others who have to use your code. But the previous answer would be way better if m_array_type ever changes it's type.