//#[inline]
fn reverse < T > ( slice : & mut [ T ] )
{
match slice {
[ ref mut a , ref mut rest @ .. , ref mut b ] = > {
std ::mem ::swap ( a , b ) ;
reverse ( rest )
} ,
[ ] | [ _ ] = > ( ) ,
}
}
/// This actually works! And is so easily parallelisable with something like rayon, or asyncing by spawning/creating the tail-call into a new task, then either waiting them concurrently or in parallen (spawn or created future from just calling the function without awaiting it)
#[ allow(dead_code) ]
fn binsearch < ' a , V : ? Sized , T : PartialEq < V > + ' a > ( slice : & ' a [ T ] , find : & V ) -> Option < & ' a T >
{
match slice {
[ ref a , pivot @ .. , ref b ] = > {
match ( a = = find , b = = find ) {
( true , _ ) = > Some ( a ) ,
( _ , true ) = > Some ( b ) ,
_ = > binsearch ( pivot , find ) ,
}
} ,
[ ref a ] if a = = find = > Some ( a ) ,
_ = > None ,
}
}
fn collect_input ( ) -> Box < dyn Iterator < Item = String > + ' static >
{
if std ::env ::args_os ( ) . len ( ) < = 1 {
use std ::io ::{
self ,
BufRead ,
} ;
// No args, collect stdin lines
Box ::new ( io ::BufReader ::new ( io ::stdin ( )
. lock ( ) )
. lines ( )
. filter_map ( Result ::ok ) )
} else {
// Has arguments, return them
Box ::new ( std ::env ::args ( ) . skip ( 1 ) )
}
}
#[ cfg_attr(feature= " ignore-output-errors " , inline(always)) ]
fn handle_fmt_err < T > ( res : std ::io ::Result < T > )
{
#[ cfg(not(feature= " ignore-output-errors " )) ]
if let Err ( e ) = res {
eprintln! ( "[!] failed to write line: {e}" ) ;
}
let _ = res ;
}
fn main ( ) {
let mut args : Vec < String > = collect_input ( ) . collect ( ) ;
reverse ( & mut args [ .. ] ) ;
//eprintln!("{:?}", binsearch(&args[..], "1")); // It works!
#[ cfg(feature= " output-lines " ) ]
{
#[ allow(unused_imports) ]
use std ::io ::{
Write , BufWriter ,
} ;
#[ cfg(feature= " buffer-output " ) ]
let mut out = BufWriter ::new ( std ::io ::stdout ( ) . lock ( ) ) ;
#[ cfg(not(feature= " buffer-output " )) ]
let mut out = std ::io ::stdout ( ) . lock ( ) ;
for x in args . iter ( ) {
handle_fmt_err ( {
if cfg! ( feature = "output-quoted" ) {
writeln! ( & mut out , "{:?}" , x )
}
else {
//writeln!(&mut out, "{}", x)
out . write ( x . as_bytes ( ) )
. and_then ( | _ | out . write ( b" \n " ) )
. map ( | _ | { } )
}
} ) ;
}
//#[cfg(feature="buffer-output")]
handle_fmt_err ( out . flush ( ) ) ; //XXX: Do we need to flush when not buffering output? Does it matter since buffering output will be enabled by default and should almost always be enabled?
}
#[ cfg(not(feature= " output-lines " )) ]
println! ( "{:?}" , args ) ;
}