111 lines
2.4 KiB
Rust
111 lines
2.4 KiB
Rust
#![warn(clippy::needless_range_loop, clippy::manual_memcpy)]
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const LOOP_OFFSET: usize = 5000;
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pub fn manual_copy(src: &[i32], dst: &mut [i32], dst2: &mut [i32]) {
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// plain manual memcpy
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for i in 0..src.len() {
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dst[i] = src[i];
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}
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// dst offset memcpy
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for i in 0..src.len() {
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dst[i + 10] = src[i];
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}
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// src offset memcpy
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for i in 0..src.len() {
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dst[i] = src[i + 10];
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}
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// src offset memcpy
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for i in 11..src.len() {
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dst[i] = src[i - 10];
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}
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// overwrite entire dst
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for i in 0..dst.len() {
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dst[i] = src[i];
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}
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// manual copy with branch - can't easily convert to memcpy!
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for i in 0..src.len() {
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dst[i] = src[i];
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if dst[i] > 5 {
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break;
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}
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}
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// multiple copies - suggest two memcpy statements
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for i in 10..256 {
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dst[i] = src[i - 5];
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dst2[i + 500] = src[i]
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}
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// this is a reversal - the copy lint shouldn't be triggered
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for i in 10..LOOP_OFFSET {
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dst[i + LOOP_OFFSET] = src[LOOP_OFFSET - i];
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}
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let some_var = 5;
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// Offset in variable
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for i in 10..LOOP_OFFSET {
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dst[i + LOOP_OFFSET] = src[i - some_var];
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}
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// Non continuous copy - don't trigger lint
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for i in 0..10 {
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dst[i + i] = src[i];
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}
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let src_vec = vec![1, 2, 3, 4, 5];
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let mut dst_vec = vec![0, 0, 0, 0, 0];
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// make sure vectors are supported
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for i in 0..src_vec.len() {
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dst_vec[i] = src_vec[i];
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}
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// lint should not trigger when either
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// source or destination type is not
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// slice-like, like DummyStruct
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struct DummyStruct(i32);
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impl ::std::ops::Index<usize> for DummyStruct {
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type Output = i32;
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fn index(&self, _: usize) -> &i32 {
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&self.0
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}
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}
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let src = DummyStruct(5);
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let mut dst_vec = vec![0; 10];
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for i in 0..10 {
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dst_vec[i] = src[i];
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}
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// Simplify suggestion (issue #3004)
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let src = [0, 1, 2, 3, 4];
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let mut dst = [0, 0, 0, 0, 0, 0];
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let from = 1;
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for i in from..from + src.len() {
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dst[i] = src[i - from];
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}
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for i in from..from + 3 {
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dst[i] = src[i - from];
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}
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}
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#[warn(clippy::needless_range_loop, clippy::manual_memcpy)]
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pub fn manual_clone(src: &[String], dst: &mut [String]) {
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for i in 0..src.len() {
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dst[i] = src[i].clone();
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}
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}
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fn main() {}
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