pre-rfc3243-libtw2-common 0.2.0

pre-rfc3243-libtw2-common
Documentation 
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use crate::relative_size_of_mult;
use crate::slice;
use std::mem;

pub unsafe fn transmute<T, U>(vec: Vec<T>) -> Vec<U> {
    slice::transmute::<T, U>(&vec); // Error checking done there.

    let ptr = vec.as_ptr();
    let len = vec.len();
    let cap = vec.capacity();
    mem::forget(vec);
    let new_cap = cap * mem::size_of::<T>() / mem::size_of::<U>();

    Vec::from_raw_parts(ptr as *mut U, relative_size_of_mult::<T, U>(len), new_cap)
}