46 lines
923 B
Rust
46 lines
923 B
Rust
#[repr(C)]
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#[derive(Copy, Clone)]
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struct Foo {
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a: u64,
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b: u64,
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c: u64,
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}
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fn main() {
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const LENGTH: usize = 10;
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let mut v: [u64; LENGTH] = [0; LENGTH];
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for idx in 0..LENGTH {
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assert_eq!(v[idx], 0);
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}
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unsafe {
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let p = v.as_mut_ptr();
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::std::ptr::write_bytes(p, 0xab, LENGTH);
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}
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for idx in 0..LENGTH {
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assert_eq!(v[idx], 0xabababababababab);
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}
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// -----
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let mut w: [Foo; LENGTH] = [Foo { a: 0, b: 0, c: 0 }; LENGTH];
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for idx in 0..LENGTH {
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assert_eq!(w[idx].a, 0);
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assert_eq!(w[idx].b, 0);
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assert_eq!(w[idx].c, 0);
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}
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unsafe {
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let p = w.as_mut_ptr();
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::std::ptr::write_bytes(p, 0xcd, LENGTH);
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}
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for idx in 0..LENGTH {
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assert_eq!(w[idx].a, 0xcdcdcdcdcdcdcdcd);
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assert_eq!(w[idx].b, 0xcdcdcdcdcdcdcdcd);
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assert_eq!(w[idx].c, 0xcdcdcdcdcdcdcdcd);
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}
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}
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