ogxd

public static class ConcatenateExtensions
{
    public static unsafe string Concatenate(this IReadOnlyList<string?> strings)
    {
        int size = 0;
        for (int i = 0; i < strings.Count; i++)
        {
            string? str = strings[i];
            if (str == null)
            {

ogxd

The Problem

What are we trying to solve?

Exception handling in .NET has several pitfalls:

Performance Overhead & Resiliency

Exception handling in .NET can be expensive in performance, especially when exceptions are thrown frequently. The process of throwing an exception involves capturing a stack trace and unwinding the stack, which is a costly operation. If an application relies heavily on exceptions for control flow, this can significantly degrade performance.

ogxd

using System;

public class C {
    
    public static int GetUnrollCountWithDivision(ReadOnlySpan<byte> bytes)
    {
        return bytes.Length >> 7 << 3;
    }
    
    public static int GetUnrollCountWithBitshift(ReadOnlySpan<byte> bytes)

ogxd

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Order;

// |              Method |                 str |       Mean |     Error |    StdDev | Allocated |
// |-------------------- |-------------------- |-----------:|----------:|----------:|----------:|
// |               Split | this(...)oose [131] | 162.522 ns | 1.7171 ns | 1.6062 ns |     760 B |
// | SplitAllocationFree | this(...)oose [131] |   1.748 ns | 0.0187 ns | 0.0175 ns |         - | 🚀

[Orderer(SummaryOrderPolicy.Declared)]
[MemoryDiagnoser(false)]

ogxd

public static class ComUtils
{
    private delegate int DllGetClassObject(ref Guid clsid, ref Guid iid, out nint classFactoryPtr);
    private delegate void CreateInstance(nint self, nint pUnkOuter, ref Guid riid, out nint ppvObjectPtr);

    public static nint Load(string library)
    {
        Guid exceptionProfilerGuid = new Guid("805A308B-061C-47F3-9B30-F785C3186E82");
        Guid iclassFactoryGuid = new Guid("00000001-0000-0000-c000-000000000046");
        Guid iCorProfilerCallback8Guid = new Guid("5BED9B15-C079-4D47-BFE2-215A140C07E0");

ogxd

sudo -i
dnctl pipe 1 config delay 300
echo "dummynet in proto {tcp,icmp} from any to any pipe 1" | pfctl -f -
pfctl -e

pfctl -f /etc/pf.conf
dnctl -q flush

ogxd

using System;
using System.Collections.Generic;
using System.Linq;

namespace Ogxd;

/// <summary>
/// Returns a string for a given enum value, without allocations
/// </summary>
/// <typeparam name="T"></typeparam>

ogxd

using System;
using System.Collections.Generic;

namespace System;

public static class StringConcatenationExtensions
{
    /// <summary>
    /// Concatenates strings with manamal allocations and good performance.
    /// (only the end result string is allocated)

ogxd

    public class ManualOptionMonitor<T> : IOptionsMonitor<T>
    {
        private readonly Dictionary<int, Action<T, string>> _listeners = new Dictionary<int, Action<T, string>>();
        private volatile int _nextId;

        private T _currentValue;
        public T CurrentValue
        {
            get
            {

ogxd

//! Prints objects, cool for debugging
println!("{:#?}", my_object);

//! Empty struct shorthand
struct MyStruct;