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// Copyright (c) 2013-2017 Sandstorm Development Group, Inc. and contributors // // Permission is hereby granted, free of charge, to any person obtaining a copy // of this software and associated documentation files (the "Software"), to deal // in the Software without restriction, including without limitation the rights // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell // copies of the Software, and to permit persons to whom the Software is // furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN // THE SOFTWARE. //! Helper type for generated Struct and List constants. //! //! `constant::Reader` does not do bounds-checking, so it is unsafe to //! manually construct one of these. use std::marker::PhantomData; use crate::any_pointer; use crate::private::layout::PointerReader; use crate::traits::Owned; use crate::{Result, Word}; #[derive(Copy, Clone)] pub struct Reader<T> { #[doc(hidden)] pub phantom: PhantomData<T>, #[doc(hidden)] pub words: &'static [Word], } impl <T> Reader<T> where T: for<'a> Owned<'a> { /// Retrieve the value. pub fn get(&self) -> Result<<T as Owned<'static>>::Reader> { any_pointer::Reader::new(PointerReader::get_root_unchecked(&self.words[0] as *const Word)).get_as() } }