Skip to content

Instantly share code, notes, and snippets.


Fons Sonnemans sonnemaf

View GitHub Profile
sonnemaf / settings.json
Created Oct 22, 2022
My Windows Terminal settings
View settings.json
"$help": "",
"$schema": "",
"action": "closeTab"
sonnemaf / RefStructProblem.cs
Created Jul 13, 2022
Unhandled exception. System.TypeLoadException: A ByRef-like type cannot be used as the type for an instance field in a non-ByRef-like type.
View RefStructProblem.cs
var line = new Line(new PointStruct(1, 2), new PointStruct(3, 4));
record struct Line {
private ref PointStruct _start;
private ref PointStruct _stop;
public ref PointStruct Start => ref _start;
View PrimesCounter.razor
<h1>Primes Counter</h1>
<button class="btn btn-primary" @onclick="CountPrimesSingleThreaded">Single Threaded</button>
<button class="btn btn-primary" @onclick="CountPrimesMultiThreaded">Multi Threaded</button>
@code {
private string _output = "Not yet executed";
private void CountPrimesSingleThreaded() {
int total = 0;
View ForEachRef.cs
var l = new List<PointStruct>() {
new PointStruct(1, 10),
new PointStruct(2, 20),
new PointStruct(3, 30),
var a = l.ToArray();
l.ForEachRef(static (ref PointStruct p) => p.Swap());
View IsPrime.cs
var sw = System.Diagnostics.Stopwatch.StartNew();
int total = 0;
for (int i = 1; i <= 20_000_000; i++) {
if (IsPrime(i)) {
Console.WriteLine($"{total} in {sw.Elapsed} sec");
View Grid.cs
using System;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Markup;
namespace ReflectionIT.Universal.Helpers {
/// <summary>
/// <Grid helpers:Grid.RowDefinitions="1*, 50, Auto,2*"
/// helpers:Grid.ColumnDefinitions="1.5*,50,Auto,2.5*" ...
/// </summary>
sonnemaf / RecordStructBenchmark.cs
Created Jul 27, 2021
Benchmark showing that a record struct with fields can be faster than with properties. Around 9% faster on my PC. If you change decimal to int they are equally fast.
View RecordStructBenchmark.cs
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;
using System;
namespace RecordStructBM {
class Program {
static void Main(string[] args) {
View SieveOfEratosthenesDemo.cs
using System;
using System.Collections;
using static System.Console;
int start = 1, end = 1000;
WriteLine($"The prime numbers between {start} and {end} are :");
BitArray bits = SieveOfEratosthenes(end);
for (int i = start; i <= end; i++)
sonnemaf /
Created Oct 2, 2020

.NET Core 5.0.0 (CoreCLR, CoreFX, X64 RyuJIT

; AbusingCSharp.Benchmarks.ArrayChunkBenchmarks.TestIndexerRef()
       sub       rsp,28
       mov       rax,[rcx+8]
       mov       rax,[rax+8]
       cmp       dword ptr [rax+8],8
       jbe       short M00_L00
       add       rax,30
       add       rsp,28
sonnemaf / NoBoundChecks.cs
Last active Oct 2, 2020
BM for removing bounds check
View NoBoundChecks.cs
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
namespace ConsoleApp68 {
class Program {