context-allocator 0.2.3

context-allocator
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// This file is part of context-allocator. It is subject to the license terms in the COPYRIGHT file found in the top-level directory of this distribution and at https://raw.githubusercontent.com/lemonrock/context-allocator/master/COPYRIGHT. No part of context-allocator, including this file, may be copied, modified, propagated, or distributed except according to the terms contained in the COPYRIGHT file.
// Copyright © 2019 The developers of context-allocator. See the COPYRIGHT file in the top-level directory of this distribution and at https://raw.githubusercontent.com/lemonrock/context-allocator/master/COPYRIGHT.


/// Useful extensions.
pub(crate) trait PointerExt<T>: Sized
{
	/// Non null.
	fn non_null(self) -> NonNull<T>;

	/// Add.
	fn add_bytes(self, offset: usize) -> Self;

	/// Add.
	#[inline(always)]
	fn add_bytes_u32(self, offset: u32) -> Self
	{
		self.add_bytes(offset as usize)
	}

	/// Add.
	#[inline(always)]
	fn add_bytes_non_zero_u32(self, offset: NonZeroU32) -> Self
	{
		self.add_bytes_u32(offset.get())
	}

	/// To usize.
	fn to_usize(self) -> usize;

	/// Is not null.
	fn is_not_null(self) -> bool;

	/// Reference.
	fn reference<'a>(self) -> &'a T;
}

impl<T> PointerExt<T> for *const T
{
	#[inline(always)]
	fn non_null(self) -> NonNull<T>
	{
		non_null_pointer(self as *mut T)
	}

	#[inline(always)]
	fn add_bytes(self, offset: usize) -> Self
	{
		((self as usize) + offset) as *const T
	}

	#[inline(always)]
	fn to_usize(self) -> usize
	{
		self as usize
	}

	#[inline(always)]
	fn is_not_null(self) -> bool
	{
		!self.is_null()
	}

	#[inline(always)]
	fn reference<'a>(self) -> &'a T
	{
		debug_assert!(self.is_not_null(), "null pointers can not be derefenced");

		unsafe { & * self }
	}
}

impl<T> PointerExt<T> for *mut T
{
	#[inline(always)]
	fn non_null(self) -> NonNull<T>
	{
		non_null_pointer(self)
	}

	#[inline(always)]
	fn add_bytes(self, offset: usize) -> Self
	{
		((self as usize) + offset) as *mut T
	}

	#[inline(always)]
	fn to_usize(self) -> usize
	{
		self as usize
	}

	#[inline(always)]
	fn is_not_null(self) -> bool
	{
		!self.is_null()
	}

	#[inline(always)]
	fn reference<'a>(self) -> &'a T
	{
		debug_assert!(self.is_not_null(), "null pointers can not be derefenced");

		unsafe { & * self }
	}
}