mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-11-23 21:23:56 +00:00
72 lines
2 KiB
Rust
72 lines
2 KiB
Rust
// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
|
|
// file at the top-level directory of this distribution.
|
|
//
|
|
// 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.
|
|
|
|
use std::iter::repeat;
|
|
|
|
fn main() {
|
|
resize_vector();
|
|
extend_vector();
|
|
mixed_extend_resize_vector();
|
|
}
|
|
|
|
fn extend_vector() {
|
|
// Extend with constant expression
|
|
let len = 300;
|
|
let mut vec1 = Vec::with_capacity(len);
|
|
vec1.extend(repeat(0).take(len));
|
|
|
|
// Extend with len expression
|
|
let mut vec2 = Vec::with_capacity(len - 10);
|
|
vec2.extend(repeat(0).take(len - 10));
|
|
|
|
// Extend with mismatching expression should not be warned
|
|
let mut vec3 = Vec::with_capacity(24322);
|
|
vec3.extend(repeat(0).take(2));
|
|
}
|
|
|
|
fn mixed_extend_resize_vector() {
|
|
// Mismatching len
|
|
let mut mismatching_len = Vec::with_capacity(30);
|
|
mismatching_len.extend(repeat(0).take(40));
|
|
|
|
// Slow initialization
|
|
let mut resized_vec = Vec::with_capacity(30);
|
|
resized_vec.resize(30, 0);
|
|
|
|
let mut extend_vec = Vec::with_capacity(30);
|
|
extend_vec.extend(repeat(0).take(30));
|
|
}
|
|
|
|
fn resize_vector() {
|
|
// Resize with constant expression
|
|
let len = 300;
|
|
let mut vec1 = Vec::with_capacity(len);
|
|
vec1.resize(len, 0);
|
|
|
|
// Resize mismatch len
|
|
let mut vec2 = Vec::with_capacity(200);
|
|
vec2.resize(10, 0);
|
|
|
|
// Resize with len expression
|
|
let mut vec3 = Vec::with_capacity(len - 10);
|
|
vec3.resize(len - 10, 0);
|
|
|
|
// Reinitialization should be warned
|
|
vec1 = Vec::with_capacity(10);
|
|
vec1.resize(10, 0);
|
|
}
|
|
|
|
fn do_stuff(vec: &mut Vec<u8>) {}
|
|
|
|
fn extend_vector_with_manipulations_between() {
|
|
let len = 300;
|
|
let mut vec1: Vec<u8> = Vec::with_capacity(len);
|
|
do_stuff(&mut vec1);
|
|
vec1.extend(repeat(0).take(len));
|
|
}
|