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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// NB: transitionary, de-mode-ing.
#[forbid(deprecated_mode)];
#[forbid(deprecated_pattern)];
//! Operations on tuples
use cmp::{Eq, Ord};
pub trait CopyableTuple<T, U> {
pure fn first() -> T;
pure fn second() -> U;
pure fn swap() -> (U, T);
}
impl<T: Copy, U: Copy> (T, U): CopyableTuple<T, U> {
/// Return the first element of self
pure fn first() -> T {
let (t, _) = self;
return t;
}
/// Return the second element of self
pure fn second() -> U {
let (_, u) = self;
return u;
}
/// Return the results of swapping the two elements of self
pure fn swap() -> (U, T) {
let (t, u) = self;
return (u, t);
}
}
pub trait ImmutableTuple<T, U> {
pure fn first_ref(&self) -> &self/T;
pure fn second_ref(&self) -> &self/U;
}
impl<T, U> (T, U): ImmutableTuple<T, U> {
pure fn first_ref(&self) -> &self/T {
match *self {
(ref t, _) => t,
}
}
pure fn second_ref(&self) -> &self/U {
match *self {
(_, ref u) => u,
}
}
}
pub trait ExtendedTupleOps<A,B> {
fn zip(&self) -> ~[(A, B)];
fn map<C>(&self, f: &fn(a: &A, b: &B) -> C) -> ~[C];
}
impl<A: Copy, B: Copy> (&[A], &[B]): ExtendedTupleOps<A,B> {
fn zip(&self) -> ~[(A, B)] {
match *self {
(ref a, ref b) => {
vec::zip_slice(*a, *b)
}
}
}
fn map<C>(&self, f: &fn(a: &A, b: &B) -> C) -> ~[C] {
match *self {
(ref a, ref b) => {
vec::map2(*a, *b, f)
}
}
}
}
impl<A: Copy, B: Copy> (~[A], ~[B]): ExtendedTupleOps<A,B> {
fn zip(&self) -> ~[(A, B)] {
match *self {
(ref a, ref b) => {
vec::zip_slice(*a, *b)
}
}
}
fn map<C>(&self, f: &fn(a: &A, b: &B) -> C) -> ~[C] {
match *self {
(ref a, ref b) => {
vec::map2(*a, *b, f)
}
}
}
}
#[cfg(notest)]
impl<A: Eq, B: Eq> (A, B) : Eq {
pure fn eq(&self, other: &(A, B)) -> bool {
match (*self) {
(ref self_a, ref self_b) => match other {
&(ref other_a, ref other_b) => {
(*self_a).eq(other_a) && (*self_b).eq(other_b)
}
}
}
}
pure fn ne(&self, other: &(A, B)) -> bool { !(*self).eq(other) }
}
#[cfg(notest)]
impl<A: Ord, B: Ord> (A, B) : Ord {
pure fn lt(&self, other: &(A, B)) -> bool {
match (*self) {
(ref self_a, ref self_b) => {
match (*other) {
(ref other_a, ref other_b) => {
if (*self_a).lt(other_a) { return true; }
if (*other_a).lt(self_a) { return false; }
if (*self_b).lt(other_b) { return true; }
return false;
}
}
}
}
}
pure fn le(&self, other: &(A, B)) -> bool { !(*other).lt(&(*self)) }
pure fn ge(&self, other: &(A, B)) -> bool { !(*self).lt(other) }
pure fn gt(&self, other: &(A, B)) -> bool { (*other).lt(&(*self)) }
}
#[cfg(notest)]
impl<A: Eq, B: Eq, C: Eq> (A, B, C) : Eq {
pure fn eq(&self, other: &(A, B, C)) -> bool {
match (*self) {
(ref self_a, ref self_b, ref self_c) => match other {
&(ref other_a, ref other_b, ref other_c) => {
(*self_a).eq(other_a) && (*self_b).eq(other_b)
&& (*self_c).eq(other_c)
}
}
}
}
pure fn ne(&self, other: &(A, B, C)) -> bool { !(*self).eq(other) }
}
#[cfg(notest)]
impl<A: Ord, B: Ord, C: Ord> (A, B, C) : Ord {
pure fn lt(&self, other: &(A, B, C)) -> bool {
match (*self) {
(ref self_a, ref self_b, ref self_c) => {
match (*other) {
(ref other_a, ref other_b, ref other_c) => {
if (*self_a).lt(other_a) { return true; }
if (*other_a).lt(self_a) { return false; }
if (*self_b).lt(other_b) { return true; }
if (*other_b).lt(self_b) { return false; }
if (*self_c).lt(other_c) { return true; }
return false;
}
}
}
}
}
pure fn le(&self, other: &(A, B, C)) -> bool { !(*other).lt(&(*self)) }
pure fn ge(&self, other: &(A, B, C)) -> bool { !(*self).lt(other) }
pure fn gt(&self, other: &(A, B, C)) -> bool { (*other).lt(&(*self)) }
}
#[test]
fn test_tuple_ref() {
let x = (~"foo", ~"bar");
assert x.first_ref() == &~"foo";
assert x.second_ref() == &~"bar";
}
#[test]
#[allow(non_implicitly_copyable_typarams)]
fn test_tuple() {
assert (948, 4039.48).first() == 948;
assert (34.5, ~"foo").second() == ~"foo";
assert ('a', 2).swap() == (2, 'a');
}
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