87 lines
2.0 KiB
Rust
87 lines
2.0 KiB
Rust
// Copyright 2014 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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/* Any copyright is dedicated to the Public Domain.
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* http://creativecommons.org/publicdomain/zero/1.0/ */
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use std::mem;
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use std::io::stdio::println;
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fn call_it(f: proc(String) -> String) {
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println!("{}", f("Fred".to_string()))
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}
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fn call_a_thunk(f: ||) {
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f();
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}
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fn call_this(f: |&str|:Send) {
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f("Hello!");
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}
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fn call_that(f: <'a>|&'a int, &'a int|: -> int) {
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let (ten, forty_two) = (10, 42);
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println!("Your lucky number is {}", f(&ten, &forty_two));
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}
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fn call_cramped(f:||->uint,g:<'a>||->&'a uint) {
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let number = f();
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let other_number = *g();
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println!("Ticket {} wins an all-expenses-paid trip to Mountain View", number + other_number);
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}
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fn call_bare(f: fn(&str)) {
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f("Hello world!")
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}
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fn call_bare_again(f: extern "Rust" fn(&str)) {
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f("Goodbye world!")
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}
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pub fn main() {
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// Procs
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let greeting = "Hello ".to_string();
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call_it(proc(s) {
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format!("{}{}", greeting, s)
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});
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let greeting = "Goodbye ".to_string();
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call_it(proc(s) format!("{}{}", greeting, s));
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let greeting = "How's life, ".to_string();
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call_it(proc(s: String) -> String {
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format!("{}{}", greeting, s)
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});
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// Closures
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call_a_thunk(|| println!("Hello world!"));
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call_this(|s| println!("{}", s));
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call_that(|x, y| *x + *y);
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let z = 100;
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call_that(|x, y| *x + *y - z);
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call_cramped(|| 1, || unsafe {
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static a: uint = 100;
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mem::transmute(&a)
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});
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// External functions
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call_bare(println);
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call_bare_again(println);
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}
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