tests/ui/filter_methods.rs

   1 // Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution.
   3 //
   4 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   5 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   7 // option. This file may not be copied, modified, or distributed
   8 // except according to those terms.
   9
  10
  11
  12
  13
  14 #![warn(clippy::all, clippy::pedantic)]
  15 #![allow(clippy::missing_docs_in_private_items)]
  16
  17 fn main() {
  18     let _: Vec<_> = vec![5; 6].into_iter()
  19                               .filter(|&x| x == 0)
  20                               .map(|x| x * 2)
  21                               .collect();
  22
  23     let _: Vec<_> = vec![5_i8; 6].into_iter()
  24                                 .filter(|&x| x == 0)
  25                                 .flat_map(|x| x.checked_mul(2))
  26                                 .collect();
  27
  28     let _: Vec<_> = vec![5_i8; 6].into_iter()
  29                                 .filter_map(|x| x.checked_mul(2))
  30                                 .flat_map(|x| x.checked_mul(2))
  31                                 .collect();
  32
  33     let _: Vec<_> = vec![5_i8; 6].into_iter()
  34                                 .filter_map(|x| x.checked_mul(2))
  35                                 .map(|x| x.checked_mul(2))
  36                                 .collect();
  37 }