runng 0.3.2

High-level wrapper around nng (Nanomsg-Next-Generation) aka Nanomsg2
Documentation 
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//! Publisher/subscriber pattern.

use super::*;
use crate::{asyncio::*, *};
use runng_sys::*;

/// Subscribe half of publisher/subscriber pattern.  See [nng_sub](https://nng.nanomsg.org/man/v1.2.2/nng_sub.7).
#[derive(Clone, Debug, NngGetOpts, NngSetOpts)]
#[prefix = "nng_socket_"]
pub struct Sub0 {
    socket: NngSocket,
}

impl Sub0 {
    /// Create a sub socket.  See [nng_sub_open](https://nng.nanomsg.org/man/v1.2.2/nng_sub_open.3).
    pub fn open() -> Result<Self> {
        nng_open(
            |socket| unsafe { nng_sub0_open(socket) },
            |socket| Sub0 { socket },
        )
    }
}

impl Subscribe for Sub0 {
    fn subscribe(&self, topic: &[u8]) -> Result<()> {
        unsafe { subscribe(self.socket.nng_socket(), topic) }
    }
    fn unsubscribe(&self, topic: &[u8]) -> Result<()> {
        unsafe { unsubscribe(self.socket.nng_socket(), topic) }
    }
}

impl GetSocket for Sub0 {
    fn socket(&self) -> &NngSocket {
        &self.socket
    }
    fn socket_mut(&mut self) -> &mut NngSocket {
        &mut self.socket
    }
}

impl Socket for Sub0 {}
impl Dial for Sub0 {}
impl Listen for Sub0 {}
impl RecvSocket for Sub0 {}

impl AsyncSocket for Sub0 {
    type ContextType = SubscribeAsyncHandle;
}

impl AsyncStream for Sub0 {
    type ContextType = SubscribeAsyncStream;
}