#data-transformation #clucompany #transmute #no-std #unsafe-transmute

no-std cluFullTransmute

A more complete and extended version of data transformation with and without constraint checking

8 stable releases

1.3.0 May 12, 2024
1.2.0 Aug 15, 2022
1.1.0 Jun 2, 2022
1.0.6 Apr 7, 2022
1.0.1 Aug 30, 2019

#2 in #clucompany

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546 downloads per month
Used in cluconstdata

Apache-2.0

30KB
492 lines

[clufulltransmute]

( A more complete and extended version of data type conversion without constraint checks. )

!!! ATTENTION !!!

  1. When converting types without checking the size of the data, you really need to understand what you are doing.
  2. You must understand the specifics of the platform you are using.

Library features:

  1. Casting any type A to any type B with generic data without and with data dimension checking.
  2. Ability to use transmutation in constant functions in very old versions of rust..
  3. Possibility of delayed transmutation through contracts.
  4. Ability to work without the standard library.

Usage:

Add this to your Cargo.toml:

[dependencies]
cluFullTransmute = "1.3.0"

and this to your source code:

use cluFullTransmute::mem::transmute;

Example:

use cluFullTransmute::transmute_or_panic;
use core::fmt::Display;

/*
	For example, let's write some code with a Drop trait that panics when dropped and
	holds some data. We then transmute this data to another similar struct and check
	that we have effectively overridden the Drop trait and have a different struct
	with some data.

	We can also remove the Drop trait altogether or do any number of other things.
*/

/// Struct to panic when dropped
#[derive(Debug)]
#[repr(transparent)]
struct PanicWhenDrop<T>(T);

impl<T> Drop for PanicWhenDrop<T> {
	fn drop(&mut self) {
		panic!("panic, discovered `drop(PanicWhenDrop);`");
	}
}

/// Struct to print value when dropped
#[derive(Debug)]
#[repr(transparent)]
struct PrintlnWhenDrop<T: Display>(T)
where
	T: Display;

impl<T> Drop for PrintlnWhenDrop<T>
where
	T: Display,
{
	fn drop(&mut self) {
		println!("println: {}", self.0);
	}
}

fn main() {
	let a: PanicWhenDrop<u16> = PanicWhenDrop(1024);
	println!("in a: {:?}", a);

	let b: PrintlnWhenDrop<u16> = unsafe { transmute_or_panic(a as PanicWhenDrop<u16>) };
	println!("out b: {:?}", b);

	drop(b); // <--- drop, PrintlnWhenDrop!
}
See all

License:

This project has a single license (LICENSE-APACHE-2.0).

uproject  Copyright (c) 2019-2024 #UlinProject

 (Denis Kotlyarov).


Apache License:

apache2  Licensed under the Apache License, Version 2.0.



No runtime deps

Features