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June 24, 2015 09:02
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#![allow(unused_mut, non_camel_case_types, dead_code, unused_variables)] | |
#![feature(trace_macros)] | |
use std::fmt::{self, Debug}; | |
/*macro_rules! using { | |
[ $pp:path : ( $($elem:ident),* ) | |
] => [ | |
use $pp :: {self, $(elem),*}; | |
]; | |
} | |
using!{ std::fmt : (Debug) }*/ | |
macro_rules! make_overloadable { | |
[ fn $fn_name:ident(); | |
] => [ | |
trait $fn_name { | |
type ReturnType; | |
fn $fn_name( &self ) -> Self::ReturnType; | |
} | |
]; | |
/*[ fn $fn_name() -> void; | |
] => [ | |
trait $fn_name { | |
type ReturnType; | |
fn $fn_name( &self ); | |
} | |
];*/ | |
} | |
//trait OVERLOADED_GENERIC_FUNCTIONS {} | |
macro_rules! overload_impl { | |
/*[ {$($func:tt)*} :: [ $($all:tt)* ] :: , $t:ident: $($trs:tt)* | |
] => [ | |
overload_impl!{ {$($func)*} :: [ $($all)*, $t: ] :: $($trs)* } | |
];*/ | |
[ {$($func:tt)*} :: [ $($all:tt)* ] :: , $t:ident $($trs:tt)* | |
] => [ | |
overload_impl!{ {$($func)*} :: [ $($all)*, $t ] :: $($trs)* } | |
]; | |
[ {$($func:tt)*} :: [ $($all:tt)* ] :: : !$tr:ident $($trs:tt)* | |
] => [ | |
overload_impl!{ {$($func)*} :: [ $($all)* : !$tr ] :: $($trs)* } | |
]; | |
[ {$($func:tt)*} :: [ $($all:tt)* ] :: : $tr:ident $($trs:tt)* | |
] => [ | |
overload_impl!{ {$($func)*} :: [ $($all)* : $tr ] :: $($trs)* } | |
]; | |
[ {$($func:tt)*} :: [ $($all:tt)* ] :: + !$tr:ident $($trs:tt)* | |
] => [ | |
overload_impl!{ {$($func)*} :: [ $($all)* + !$tr ] :: $($trs)* } | |
]; | |
[ {$($func:tt)*} :: [ $($all:tt)* ] :: + $tr:ident $($trs:tt)* | |
] => [ | |
overload_impl!{ {$($func)*} :: [ $($all)* + $tr ] :: $($trs)* } | |
]; | |
[ {$func:ident; ($( $arg:ident : $typ:ty ),+); $ret:ty => $body:block} :: [ $($all:tt)* ] :: ; | |
] => [ | |
impl< $($all)* > $func for ( $( $typ ),+ ) { | |
type ReturnType = $ret; | |
fn $func ( &self ) -> $ret | |
{ | |
let & ( $( ref $arg ),+ ) = self; | |
$body | |
} | |
} | |
]; | |
[ {$func:ident; ($( $arg:ident : $typ:ty ),+); $ret:ty => $body:block} | $t:ident | |
] => [ | |
impl< $t > $func for ( $( $typ ),+ ) { | |
type ReturnType = $ret; | |
fn $func ( &self ) -> $ret | |
{ | |
let & ( $( ref $arg ),+ ) = self; | |
$body | |
} | |
} | |
]; | |
[ {$($func:tt)*} | $t:ident, $($trs:tt)* | |
] => [ | |
overload_impl!{ {$($func)*} :: [ $t, ] :: $($trs)*; } | |
]; | |
[ {$($func:tt)*} | $t:ident, $($trs:tt)* | |
] => [ | |
overload_impl!{ {$($func)*} :: [ $t, ] :: $($trs)*; } | |
]; | |
[ {$($func:tt)*} | $t:ident : $tr:ident $($trs:tt)* | |
] => [ | |
overload_impl!{ {$($func)*} :: [ $t : $tr ] :: $($trs)*; } | |
]; | |
[ {$($func:tt)*} | $t:ident : ! $tr:ident $($trs:tt)* | |
] => [ | |
overload_impl!{ {$($func)*} :: [ $t : ! $tr ] :: $($trs)*; } | |
]; | |
[ $implementation:item ] => [ $implementation ]; | |
} | |
trace_macros!(true); | |
macro_rules! overload { | |
( [ $( $t:ident $(:$tr:ident)+ ),* ] | |
fn $func:ident( $( $arg:ident : $typ:ident ),+ ) $body:block | |
) => [ | |
impl< $( $t : $( $tr +)+ ),* > $func for ( $( $typ ),+ ) { | |
type ReturnType = (); | |
fn $func ( &self ) | |
{ | |
let & ( $( ref $arg ),+ ) = self; | |
$body | |
} | |
} | |
]; | |
( [ $( $t:ident $(:$tr:ident)+ ),* ] | |
fn $func:ident( $( $arg:ident : $typ:ident ),+ ) -> $ret:ty => $body:block | |
) => [ | |
impl< $( $t : $( $tr +)+ ),* > $func for ( $( $typ ),+ ) { | |
type ReturnType = $ret; | |
fn $func ( &self ) -> $ret | |
{ | |
let & ( $( ref $arg ),+ ) = self; | |
$body | |
} | |
} | |
]; | |
( | |
fn $func:ident( $( $arg:ident : $typ:ty ),+ ) | |
[ $( $T1:ident $(.$tr:ident)* ),* ] | |
// older syntax | |
/*[ $($T0:ident.)* ] [ $( #$T1:ident $(+$tr:ident)* );* ]*/ | |
$body:block | |
) => [ | |
impl | |
< | |
/*$($T0),*/ | |
$( $T1 : $( $tr +)* ),* | |
> $func for ( $( $typ ),+ ) { | |
type ReturnType = (); | |
fn $func ( &self ) | |
{ | |
let & ( $( ref $arg ),+ ) = self; | |
$body | |
} | |
} | |
]; | |
( | |
fn $func:ident( $( $arg:ident : $typ:ty ),+ ) -> $ret:ty | |
/*[ $($T0:ident.)* ]*/ [$($generics:tt)*]//[ $( $T1:ident $(.$tr:tt)* );* ] | |
$body:block | |
) => [ | |
/*impl | |
< | |
//expand_gens!{ | |
$($generics)* | |
/*$($T0),*/ | |
//$( $T1 : $( $tr +)* ),* | |
> $func for ( $( $typ ),+ ) { | |
{ | |
type ReturnType = $ret; | |
fn $func ( &self ) -> $ret | |
{ | |
let & ( $( ref $arg ),+ ) = self; | |
$body | |
} | |
}*/ | |
overload_impl!{ {$func; ($( $arg : $typ ),+); $ret => $body} | $($generics)* } | |
]; | |
} | |
make_overloadable! { | |
fn mk(); | |
} | |
overload! { | |
fn mk( s: (T, bool), g: G ) -> (bool, u8) | |
[ T: Debug, G: !Debug + Copy ] | |
{ | |
println!("{:?}'tup; | |
| {:?}", s, g); | |
(false, 9) | |
} | |
}// | |
/* | |
```{.rust} | |
haskell! { | |
mk :: U: Debug, Copy => () -> () { | |
} | |
} | |
``` | |
*/ | |
overload! { | |
[]fn mk( s: char, g: i32, c: char ) | |
{ | |
println!("{}; {:?}", s, g); | |
} | |
} | |
fn mk<U: fmt::Debug + Copy>(s: i32, g: U) -> bool { | |
println!("{}; {:?}", s, g); | |
false | |
} | |
fn main() { | |
println!("Hello, world!"); | |
mk(32, 'a'); | |
((42, false), 'Z').mk(); | |
('F', 63, 'x').mk(); | |
} | |
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