38 lines
1.3 KiB
Rust
38 lines
1.3 KiB
Rust
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// run-rustfix
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#![allow(unused)]
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#![warn(clippy::manual_slice_size_calculation)]
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use core::mem::{align_of, size_of};
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fn main() {
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let v_i32 = Vec::<i32>::new();
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let s_i32 = v_i32.as_slice();
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// True positives:
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let _ = std::mem::size_of_val(s_i32); // WARNING
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let _ = std::mem::size_of_val(s_i32); // WARNING
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let _ = std::mem::size_of_val(s_i32) * 5; // WARNING
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let len = s_i32.len();
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let size = size_of::<i32>();
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let _ = std::mem::size_of_val(s_i32); // WARNING
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let _ = std::mem::size_of_val(s_i32); // WARNING
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let _ = std::mem::size_of_val(s_i32); // WARNING
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// True negatives:
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let _ = size_of::<i32>() + s_i32.len(); // Ok, not a multiplication
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let _ = size_of::<i32>() * s_i32.partition_point(|_| true); // Ok, not len()
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let _ = size_of::<i32>() * v_i32.len(); // Ok, not a slice
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let _ = align_of::<i32>() * s_i32.len(); // Ok, not size_of()
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let _ = size_of::<u32>() * s_i32.len(); // Ok, different types
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// False negatives:
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let _ = 5 * size_of::<i32>() * s_i32.len(); // Ok (MISSED OPPORTUNITY)
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let _ = size_of::<i32>() * 5 * s_i32.len(); // Ok (MISSED OPPORTUNITY)
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}
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const fn _const(s_i32: &[i32]) {
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// True negative:
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let _ = s_i32.len() * size_of::<i32>(); // Ok, can't use size_of_val in const
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}
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