Method exception

src/api/cpp/exception.cpp:21–23

namespace af {

exception::exception() : m_msg{}, m_err(AF_ERR_UNKNOWN) {
    strncpy(m_msg, "unknown exception", sizeof(m_msg));
}

exception::exception(const char *msg) : m_msg{}, m_err(AF_ERR_UNKNOWN) {
    strncpy(m_msg, msg, sizeof(m_msg) - 1);