Le 19/07/2013 10:17, Thiez a écrit :
I think something along these lines should do:fn bitwise_compare<T>(a: &T, b: &T) -> bool { use std::{ptr,sys,cast,uint}; let size = sys::size_of::<T>(); unsafe { let a: &u8 = cast::transmute(a); let b: &u8 = cast::transmute(b); for uint::range(0,size) |n| { if *ptr::offset(a,n) != *ptr::offset(b,n){ return false } } } true } Note that it won't work for strings and vectors. It could be slightly more efficient by comparing in larger chunks than u8, but LLVM will probably figure that out.
There’s code in libstd that uses libc::memcpm instead of an explicit loop: https://github.com/mozilla/rust/blob/06fec5243b/src/libstd/vec.rs#L2091 Cheers, -- Simon Sapin _______________________________________________ Rust-dev mailing list Rust-dev@mozilla.org https://mail.mozilla.org/listinfo/rust-dev
