babfdafb10
Add `MaybeUninit` method `array_assume_init` When initialising an array element-by-element, the conversion to the initialised array is done through `mem::transmute`, which is both ugly and does not work with const generics (see #61956). This PR proposes the associated method `array_assume_init`, matching the style of `slice_assume_init_*`: ```rust unsafe fn array_assume_init<T, const N: usize>(array: [MaybeUninit<T>; N]) -> [T; N]; ``` Example: ```rust let mut array: [MaybeUninit<i32>; 3] = MaybeUninit::uninit_array(); array[0].write(0); array[1].write(1); array[2].write(2); // SAFETY: Now safe as we initialised all elements let array: [i32; 3] = unsafe { MaybeUninit::array_assume_init(array) }; ``` Things I'm unsure about: * Should this be a method of array instead? * Should the function be const? |
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