unsafe Questions
4
Solved
I want to use c++ code in c# for Unity using CLR.
The program works properly outside of unity, but inside of engine it gives me an error:
"cs0227: unsafe code requires the 'unsafe' command li...
Calc asked 24/8, 2016 at 19:59
2
Solved
I have multiple threads doing a computation and want to collect the results into a pre-allocated vector. To turn off the borrow checker, I wrote the function:
fn set_unsync(vec: &Vec<usize&g...
Negro asked 10/10, 2022 at 20:33
5
Solved
I'm trying to create an array of bytes whose length is UInt32.MaxValue. This array is essentially a small(ish) in-memory database:
byte[] countryCodes = new byte[UInt32.MaxValue];
On my machine,...
1
I used the bindgen crate to create bindings from Rust to a C library but I get a whole bunch of warnings saying:
warning: `extern` block uses type `u128`, which is not FFI-safe
= note: 128-bit inte...
8
Solved
Why do I get the following error?
Unsafe code may only appear if compiling with /unsafe"?
I work in C# and Visual Studio 2008 for programming on Windows CE.
Arise asked 8/1, 2010 at 8:49
2
Solved
The std::cell::Ref struct in Rust is defined as follows:
pub struct Ref<'b, T: ?Sized + 'b> {
// NB: we use a pointer instead of `&'b T` to avoid `noalias` violations, because a
// `Ref...
Gadoid asked 2/12, 2023 at 14:8
3
Solved
Let's say I want to have a value type of 7 bytes (or 3 or 777).
I can define it like that:
public struct Buffer71
{
public byte b0;
public byte b1;
public byte b2;
public byte b3;
public byt...
Pish asked 21/5, 2010 at 10:57
1
Solved
I have the following data structure (simplified):
use std::collections::HashMap;
pub struct StringCache {
// the hashmap keys point to elements stored in `storage`
// so never outlive this datast...
Necrophobia asked 30/5, 2023 at 12:11
17
I know Java doesn't have pointers, but I heard that Java programs can be created with pointers and that this can be done by the few who are experts in Java. Is it true?
2
Solved
With the release of C# 7.2 there is now the ability to have readonly structs, which in many cases can improve performance.
For one of my structs I am using a fixed-size byte array to actually hold...
4
Solved
I have a byte buffer of unknown size, and I want to create a local struct variable pointing to the memory of the beginning of the buffer. Following what I'd do in C, I tried a lot of different thin...
Marindamarinduque asked 28/2, 2017 at 2:23
5
Solved
I'm trying to convert a Vec of u32s to a Vec of u8s, preferably in-place and without too much overhead.
My current solution relies on unsafe code to re-construct the Vec. Is there a better way to ...
3
Solved
Is it possible to use Moq to mock an unsafe interface? For example I have (MCVE):
[TestClass]
public class UnitTest1
{
[TestMethod]
public unsafe void TestMethod1()
{
Mock<IMyUnsafeInterfac...
Panpsychist asked 2/9, 2014 at 10:20
3
Solved
Consider the following:
import (
"log"
"unsafe"
)
type Foo struct {
Bar int32
}
func main() {
log.Println(int(unsafe.Sizeof(Foo{})))
}
Why is determining the size of a variable considered ...
1
Solved
How can old school multi-threading (no wrapping mutex) can be achieve in Rust? And why is it undefined behavior?
I have to build a highly concurrent physic simulation. I am supposed to do it in C, ...
Mapp asked 27/1, 2023 at 0:2
5
Solved
I came across a situation where I have a pretty big file that I need to read binary data from.
Consequently, I realized that the default BinaryReader implementation in .NET is pretty slow. Upon lo...
Halfway asked 6/8, 2009 at 11:47
2
I have a fixed-size array [T; SIZE] of values of a type T that is ordered (it implements Ord, but not necessarily Clone or Default). I would like to extract the smallest value of the array and drop...
Rotation asked 30/7, 2020 at 9:27
4
Solved
I'm developing for a single-core embedded chip. In C & C++ it's common to statically-define mutable values that can be used globally. The Rust equivalent is roughly this:
static mut MY_VALUE: u...
9
Solved
I would like to get a byte[] from a float[] as quickly as possible, without looping through the whole array (via a cast, probably). Unsafe code is fine. Thanks!
I am looking for a byte array 4 tim...
3
Solved
3
Solved
I have a C# class that contains an int[] array (and a couple of other fields, but the array is the main thing). The code often creates copies of this class and profiling shows that the Array.Copy()...
Assistance asked 23/4, 2014 at 15:27
2
I'm running into a Rust borrow checker error that I believe is a limitation of the current implementation of non-lexical lifetimes. The code I want to write looks something like this:
struct Thing ...
Lactalbumin asked 22/10, 2021 at 16:23
4
Solved
Until now I have just taken for granted that Marshal.SizeOf is the right way to compute the memory size of a blittable struct on the unmanaged heap (which seems to be the consensus here on SO and a...
3
Solved
I'm trying to compile a program on the new DNX4.6 core, but it won't compile due to:
error CS0227: Unsafe code may only appear if compiling with /unsafe
This is my code:
[CompilerGenerated]
pub...
Marou asked 8/7, 2015 at 14:9
2
Solved
I know using the /unsafe flag in C#, you can use pointers. In C/C++ to delete a pointer you would use free(pointer); and delete pointer; respectively. However, how would you achieve the same effect...
Rammish asked 11/8, 2013 at 14:27
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