1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
// Copyright 2020 bluss and ndarray developers. // // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your // option. This file may not be copied, modified, or distributed // except according to those terms. use std::mem::MaybeUninit; use crate::imp_prelude::*; use crate::RawDataSubst; /// Methods specific to arrays with `MaybeUninit` elements. /// /// ***See also all methods for [`ArrayBase`]*** /// /// [`ArrayBase`]: struct.ArrayBase.html impl<A, S, D> ArrayBase<S, D> where S: RawDataSubst<A, Elem=MaybeUninit<A>>, D: Dimension, { /// **Promise** that the array's elements are all fully initialized, and convert /// the array from element type `MaybeUninit<A>` to `A`. /// /// For example, it can convert an `Array<MaybeUninit<f64>, D>` to `Array<f64, D>`. /// /// ## Safety /// /// Safe to use if all the array's elements have been initialized. /// /// Note that for owned and shared ownership arrays, the promise must include all of the /// array's storage; it is for example possible to slice these in place, but that must /// only be done after all elements have been initialized. pub unsafe fn assume_init(self) -> ArrayBase<<S as RawDataSubst<A>>::Output, D> { let ArrayBase { data, ptr, dim, strides } = self; // "transmute" from storage of MaybeUninit<A> to storage of A let data = S::data_subst(data); let ptr = ptr.cast::<A>(); ArrayBase::from_data_ptr(data, ptr).with_strides_dim(strides, dim) } }