pub fn has(capability: &str) -> Option<bool>Expand description
Return true if the used 0MQ library has the given capability.
The return value is always the Some variant; it used to return
None for older, now unsupported versions of 0MQ that didn’t have
the wrapped zmq_has function. Thus, for code that requires zmq
version 0.9.0 or newer, you can safely call unwrap on the return
value.
For a list of capabilities, please consult the zmq_has manual
page.
§Compatibility
In the zmq 0.10.0, this function will simply return bool.