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doc: add example for std::net::lookup_addr #30188

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Dec 7, 2015
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doc: add example for std::net::lookup_addr #30188

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16 changes: 16 additions & 0 deletions src/libstd/net/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -134,6 +134,22 @@ pub fn lookup_host(host: &str) -> io::Result<LookupHost> {
/// This function may perform a DNS query to resolve `addr` and may also inspect
/// system configuration to resolve the specified address. If the address
/// cannot be resolved, it is returned in string format.
///
/// # Examples
///
/// ```no_run
/// #![feature(lookup_addr)]
/// #![feature(ip_addr)]
///
/// use std::net::{self, Ipv4Addr, IpAddr};
///
/// let ip_addr = "8.8.8.8";
/// let addr: Ipv4Addr = ip_addr.parse().unwrap();
/// let hostname = net::lookup_addr(&IpAddr::V4(addr)).unwrap();
///
/// println!("{} --> {}", ip_addr, hostname);
/// // Output: 8.8.8.8 --> google-public-dns-a.google.com
/// ```
#[unstable(feature = "lookup_addr", reason = "recent addition",
issue = "27705")]
pub fn lookup_addr(addr: &IpAddr) -> io::Result<String> {
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