breadx 0.1.9

Implementation of the X Window System Protocol
Documentation 
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// MIT/Apache2 License

use super::auto::xproto::QueryExtensionReply;
use core::convert::TryFrom;

/// Data related to an extension.
#[derive(Debug, Copy, Clone, PartialOrd, Ord, PartialEq, Eq, Hash)]
pub struct Extension {
    pub major_opcode: u8,
    pub first_event: u8,
    pub first_error: u8,
}

impl TryFrom<QueryExtensionReply> for Extension {
    type Error = crate::BreadError;

    #[inline]
    fn try_from(qer: QueryExtensionReply) -> crate::Result<Extension> {
        if qer.present {
            Ok(Self {
                major_opcode: qer.major_opcode,
                first_event: qer.first_event,
                first_error: qer.first_error,
            })
        } else {
            Err(crate::BreadError::ExtensionNotPresent)
        }
    }
}