'\" t
.\"     Title: zmq_cpp
.\"    Author: [see the "AUTHORS" section]
.\" Generator: DocBook XSL Stylesheets v1.75.2 <http://docbook.sf.net/>
.\"      Date: 04/04/2012
.\"    Manual: 0MQ Manual
.\"    Source: 0MQ 2.2.0
.\"  Language: English
.\"
.TH "ZMQ_CPP" "7" "04/04/2012" "0MQ 2\&.2\&.0" "0MQ Manual"
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.SH "NAME"
zmq_cpp \- interface between 0MQ and C++ applications
.SH "SYNOPSIS"
.sp
\fB#include <zmq\&.hpp>\fR
.sp
\fBc++\fR [\fIflags\fR] \fIfiles\fR \fB\-lzmq\fR [\fIlibraries\fR]
.SH "DESCRIPTION"
.sp
This manual page describes how the 0MQ C++ language binding maps to the underlying 0MQ C library functions\&.
.sp
All 0MQ constants defined by \fIzmq\&.h\fR are also available to the C++ language binding\&.
.sp
The following classes are provided in the \fIzmq\fR namespace:
.SS "Context"
.sp
The \fIcontext_t\fR class encapsulates functionality dealing with the initialisation and termination of a 0MQ \fIcontext\fR\&.
.sp
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBConstructor\fR
.RS 4
.sp
.if n \{\
.RS 4
.\}
.nf
\fBcontext_t::context_t(int \fR\fB\fIio_threads\fR\fR\fB)\fR
.fi
.if n \{\
.RE
.\}
.sp
Maps to the \fIzmq_init()\fR function, as described in \fBzmq_init\fR(3)\&.
.RE
.sp
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBDestructor\fR
.RS 4
.sp
.if n \{\
.RS 4
.\}
.nf
\fBcontext_t::~context_t(void)\fR
.fi
.if n \{\
.RE
.\}
.sp
Maps to the \fIzmq_term()\fR function, as described in \fBzmq_term\fR(3)\&.
.RE
.sp
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBMethods\fR
.RS 4
.sp
None\&.
.RE
.SS "Socket"
.sp
The \fIsocket_t\fR class encapsulates a 0MQ socket\&.
.sp
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBConstructor\fR
.RS 4
.sp
.if n \{\
.RS 4
.\}
.nf
\fBsocket_t::socket_t(context_t \fR\fB\fI&context\fR\fR\fB, int \fR\fB\fItype\fR\fR\fB)\fR
.fi
.if n \{\
.RE
.\}
.sp
Maps to the \fIzmq_socket()\fR function, as described in \fBzmq_socket\fR(3)\&.
.RE
.sp
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBDestructor\fR
.RS 4
.sp
.if n \{\
.RS 4
.\}
.nf
\fBsocket_t::~socket_t(void)\fR
.fi
.if n \{\
.RE
.\}
.sp
Calls the \fIzmq_close()\fR function, as described in \fBzmq_close\fR(3)\&.
.RE
.sp
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBMethods\fR
.RS 4
.sp
.if n \{\
.RS 4
.\}
.nf
\fBvoid socket_t::getsockopt(int \fR\fB\fIoption_name\fR\fR\fB, void \fR\fB\fI*option_value\fR\fR\fB, size_t
\fR\fB\fI*option_len\fR\fR\fB)\fR
.fi
.if n \{\
.RE
.\}
.sp
Maps to the \fIzmq_getsockopt()\fR function, as described in \fBzmq_getsockopt\fR(3)\&.
.sp
.if n \{\
.RS 4
.\}
.nf
\fBvoid socket_t::setsockopt(int \fR\fB\fIoption_name\fR\fR\fB, const void \fR\fB\fI*option_value\fR\fR\fB, size_t
\fR\fB\fIoption_len\fR\fR\fB)\fR
.fi
.if n \{\
.RE
.\}
.sp
Maps to the \fIzmq_setsockopt()\fR function, as described in \fBzmq_setsockopt\fR(3)\&.
.sp
.if n \{\
.RS 4
.\}
.nf
\fBvoid socket_t::bind(const char \fR\fB\fI*endpoint\fR\fR\fB)\fR
.fi
.if n \{\
.RE
.\}
.sp
Maps to the \fIzmq_bind()\fR function, as described in \fBzmq_bind\fR(3)\&.
.sp
.if n \{\
.RS 4
.\}
.nf
\fBvoid socket_t::connect(const char \fR\fB\fI*endpoint\fR\fR\fB)\fR
.fi
.if n \{\
.RE
.\}
.sp
Maps to the \fIzmq_connect()\fR function, as described in \fBzmq_connect\fR(3)\&.
.sp
.if n \{\
.RS 4
.\}
.nf
\fBbool socket_t::send(message_t \fR\fB\fI&msg\fR\fR\fB, int \fR\fB\fIflags\fR\fR\fB = 0)\fR
.fi
.if n \{\
.RE
.\}
.sp
Maps to the \fIzmq_send()\fR function, as described in \fBzmq_send\fR(3)\&. Returns true if message is successfully sent, false if it is not\&.
.sp
.if n \{\
.RS 4
.\}
.nf
\fBbool socket_t::recv(message_t \fR\fB\fI*msg\fR\fR\fB, int \fR\fB\fIflags\fR\fR\fB = 0)\fR
.fi
.if n \{\
.RE
.\}
.sp
Maps to the \fIzmq_recv()\fR function, as described in \fBzmq_recv\fR(3)\&. Returns true if message is successfully received, false if it is not\&.
.RE
.SS "Message"
.sp
The \fIzmq::message_t\fR class encapsulates the \fIzmq_msg_t\fR structure and functions to construct, destruct and manipulate 0MQ messages\&.
.sp
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBConstructor\fR
.RS 4
.sp
.if n \{\
.RS 4
.\}
.nf
\fBmessage_t::message_t(void)\fR
\fBmessage_t::message_t(size_t \fR\fB\fIsize\fR\fR\fB)\fR
\fBmessage_t::message_t(void \fR\fB\fI*data\fR\fR\fB, size_t \fR\fB\fIsize\fR\fR\fB, free_fn \fR\fB\fI*ffn\fR\fR\fB)\fR
.fi
.if n \{\
.RE
.\}
.sp
These map to the \fIzmq_msg_init()\fR, \fIzmq_msg_init_size()\fR and \fIzmq_msg_init_data()\fR functions, described in \fBzmq_msg_init\fR(3), \fBzmq_msg_init_size\fR(3) and \fBzmq_msg_init_data\fR(3) respectively\&.
.RE
.sp
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBDestructor\fR
.RS 4
.sp
.if n \{\
.RS 4
.\}
.nf
\fBmessage_t::~message_t(void)\fR
.fi
.if n \{\
.RE
.\}
.sp
Calls the \fIzmq_msg_close()\fR function, as described in \fBzmq_msg_close\fR(3)\&.
.RE
.sp
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBMethods\fR
.RS 4
.sp
.if n \{\
.RS 4
.\}
.nf
\fBvoid *message_t::data (void)\fR
.fi
.if n \{\
.RE
.\}
.sp
Maps to the \fIzmq_msg_data()\fR function, as described in \fBzmq_msg_data\fR(3)\&.
.sp
.if n \{\
.RS 4
.\}
.nf
\fBsize_t message_t::size (void)\fR
.fi
.if n \{\
.RE
.\}
.sp
Maps to the \fIzmq_msg_size()\fR function, as described in \fBzmq_msg_size\fR(3)\&.
.sp
.if n \{\
.RS 4
.\}
.nf
\fBvoid message_t::copy (message_t \fR\fB\fI*src\fR\fR\fB)\fR
.fi
.if n \{\
.RE
.\}
.sp
Maps to the \fIzmq_msg_copy()\fR function, as described in \fBzmq_msg_copy\fR(3)\&.
.sp
.if n \{\
.RS 4
.\}
.nf
\fBvoid message_t::move (message_t \fR\fB\fI*src\fR\fR\fB)\fR
.fi
.if n \{\
.RE
.\}
.sp
Maps to the \fIzmq_msg_move()\fR function, as described in \fBzmq_msg_move\fR(3)\&.
.sp
.if n \{\
.RS 4
.\}
.nf
\fBmessage_t::rebuild(void)\fR
\fBmessage_t::rebuild(size_t \fR\fB\fIsize\fR\fR\fB)\fR
\fBmessage_t::rebuild(void \fR\fB\fI*data\fR\fR\fB, size_t \fR\fB\fIsize\fR\fR\fB, free_fn \fR\fB\fI*ffn\fR\fR\fB)\fR
.fi
.if n \{\
.RE
.\}
.sp
Equivalent to calling the \fIzmq_msg_close()\fR function followed by the corresponding \fIzmq_msg_init()\fR function\&.
.RE
.SS "Input/output multiplexing"
.sp
.if n \{\
.RS 4
.\}
.nf
\fBint poll (zmq_pollitem_t *items, int nitems, long timeout = \-1)\fR
.fi
.if n \{\
.RE
.\}
.sp
The \fIpoll()\fR function is a namespaced equivalent of the \fIzmq_poll()\fR function, as described in \fBzmq_poll\fR(3)\&.
.if n \{\
.sp
.\}
.RS 4
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBNote\fR
.ps -1
.br
.sp
To obtain a 0MQ \fIsocket\fR for use in a \fIzmq_pollitem_t\fR structure, you should cast an instance of the \fIsocket_t\fR class to (void *)\&.
.sp .5v
.RE
.SH "ERROR HANDLING"
.sp
All errors reported by the underlying 0MQ C library functions are automatically converted to exceptions by the C++ language binding\&. The \fIzmq::error_t\fR class is derived from the \fIstd::exception\fR class and uses the \fIzmq_strerror()\fR function to convert the error code to human\-readable string\&.
.SH "EXAMPLE"
.sp
.if n \{\
.RS 4
.\}
.nf
zmq::context_t ctx (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);
.fi
.if n \{\
.RE
.\}
.SH "SEE ALSO"
.sp
\fBzmq\fR(7)
.SH "AUTHORS"
.sp
This manual page was written by the 0MQ community\&.