NAME
zmq_cpp - interface between 0MQ and C++ applications
SYNOPSIS
#include <zmq.hpp>
c++ [flags] files -lzmq [libraries]
DESCRIPTION
This manual page describes how the 0MQ C++ language binding maps to the
underlying 0MQ C library functions.
All 0MQ constants defined by zmq.h are also available to the C++
language binding.
The following classes are provided in the zmq namespace:
Context
The context_t class encapsulates functionality dealing with the
initialisation and termination of a 0MQ context.
Constructor
context_t::context_t(int app_threads, int io_threads, int flags = 0)
Maps to the zmq_init() function, as described in zmq_init(3).
Destructor
context_t::~context_t(void)
Maps to the zmq_term() function, as described in zmq_term(3).
Methods
None.
Socket
The socket_t class encapsulates a 0MQ socket.
Constructor
socket_t::socket_t(context_t &context, int type)
Maps to the zmq_socket() function, as described in zmq_socket(3).
Destructor
socket_t::~socket_t(void)
Calls the zmq_close() function, as described in zmq_close(3).
Methods
void socket_t::setsockopt(int option_name, const void *option_value, size_t
option_len)
Maps to the zmq_setsockopt() function, as described in
zmq_setsockopt(3).
void socket_t::bind(const char *address)
Maps to the zmq_bind() function, as described in zmq_bind(3).
void socket_t::connect(const char *address)
Maps to the zmq_connect() function, as described in zmq_connect(3).
bool socket_t::send(message_t &msg, int flags = 0)
Maps to the zmq_send() function, as described in zmq_send(3).
bool socket_t::recv(message_t *msg, int flags = 0)
Maps to the zmq_recv() function, as described in zmq_recv(3).
Message
The zmq::message_t class encapsulates the zmq_msg_t structure and
functions to construct, destruct and manipulate 0MQ messages.
Constructor
message_t::message_t(void)
message_t::message_t(size_t size)
message_t::message_t(void *data, size_t size, free_fn *ffn)
These map to the zmq_msg_init(), zmq_msg_init_size() and
zmq_msg_init_data() functions, described in zmq_msg_init(3),
zmq_msg_init_size(3) and linkzmq_msg_init_data[3] respectively.
Destructor
message_t::~message_t(void)
Calls the zmq_msg_close() function, as described in
zmq_msg_close(3).
Methods
void *message_t::data (void)
Maps to the zmq_msg_data() function, as described in
zmq_msg_data(3).
size_t message_t::size (void)
Maps to the zmq_msg_size() function, as described in
zmq_msg_size(3).
void message_t::copy (message_t *src)
Maps to the zmq_msg_copy() function, as described in
zmq_msg_copy(3).
void message_t::move (message_t *src)
Maps to the zmq_msg_move() function, as described in
zmq_msg_move(3).
message_t::rebuild(void)
message_t::rebuild(size_t size)
message_t::rebuild(void *data, size_t size, free_fn *ffn)
Equivalent to calling the zmq_msg_close() function followed by the
corresponding zmq_msg_init() function.
Input/output multiplexing
The poll() function is a namespaced equivalent of the zmq_poll()
function, as described in zmq_poll(3).
ERROR HANDLING
All errors reported by the underlying 0MQ C library functions are
automatically converted to exceptions by the C++ language binding. The
zmq::error_t class is derived from the std::exception class and uses
the zmq_strerror() function to convert the error code to human-readable
string.
EXAMPLE
zmq::context_t ctx (1, 1);
zmq::socket_t s (ctx, ZMQ_PUB);
s.connect ("tcp://192.168.0.115:5555");
zmq::message_t msg (100);
memset (msg.data (), 0, 100);
s.send (msg);
SEE ALSO
zmq(7)
AUTHORS
The 0MQ documentation was written by Martin Sustrik
<sustrik@250bpm.com[1]> and Martin Lucina <mato@kotelna.sk[2]>.
NOTES
1. sustrik@250bpm.com
mailto:sustrik@250bpm.com
2. mato@kotelna.sk
mailto:mato@kotelna.sk