This issue tracks additional methods on Layout which allow layouts to be composed to build complex layouts.
pub const fn padding_needed_for(&self, align: usize) -> usize; pub const fn repeat(&self, n: usize) -> Result<(Layout, usize), LayoutErr>; pub const fn repeat_packed(&self, n: usize) -> Result<Layout, LayoutErr>; pub const fn extend_packed(&self, next: Layout) -> Result<Layout, LayoutErr>; pub const fn dangling(&self) -> NonNull<u8>;
The main use case is to construct complex allocation layouts for use with the stable global allocator API. For example:
std::collections::HashMaphashbrowncrossbeam-skiplistOne concern is that not many of these methods have been extensively used in practice. In the examples given above, only extend, array and align_to are used, and I expect that these will be the most used in practice. padding_needed_for is used in the implementation of Rc::from_raw and Arc::from_raw, but in theory could be superseded by the offset returned by extend.
stepancheg, orzogc, MrCroxx and boozooksilverlyra and MrCroxxstanislav-tkach, gxtaillon, joseluis and tuguzT
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