103 lines
2 KiB
Rust
103 lines
2 KiB
Rust
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// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(tuple_struct_self_ctor)]
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#![allow(dead_code)]
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use std::fmt::Display;
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struct ST1(i32, i32);
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impl ST1 {
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fn new() -> Self {
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ST1(0, 1)
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}
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fn ctor() -> Self {
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Self(1,2) // Self as a constructor
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}
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fn pattern(self) {
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match self {
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Self(x, y) => println!("{} {}", x, y), // Self as a pattern
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}
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}
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}
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struct ST2<T>(T); // With type parameter
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impl<T> ST2<T> where T: Display {
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fn ctor(v: T) -> Self {
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Self(v)
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}
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fn pattern(&self) {
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match self {
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Self(ref v) => println!("{}", v),
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}
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}
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}
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struct ST3<'a>(&'a i32); // With lifetime parameter
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impl<'a> ST3<'a> {
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fn ctor(v: &'a i32) -> Self {
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Self(v)
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}
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fn pattern(self) {
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let Self(ref v) = self;
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println!("{}", v);
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}
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}
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struct ST4(usize);
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impl ST4 {
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fn map(opt: Option<usize>) -> Option<Self> {
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opt.map(Self) // use `Self` as a function passed somewhere
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}
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}
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struct ST5; // unit struct
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impl ST5 {
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fn ctor() -> Self {
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Self // `Self` as a unit struct value
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}
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fn pattern(self) -> Self {
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match self {
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Self => Self, // `Self` as a unit struct value for matching
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}
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}
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}
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fn main() {
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let v1 = ST1::ctor();
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v1.pattern();
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let v2 = ST2::ctor(10);
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v2.pattern();
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let local = 42;
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let v3 = ST3::ctor(&local);
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v3.pattern();
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let v4 = Some(1usize);
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let _ = ST4::map(v4);
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let v5 = ST5::ctor();
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v5.pattern();
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}
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