dadhi

<Project Sdk="Microsoft.NET.Sdk">
    <PropertyGroup>
        <OutputType>Exe</OutputType>
        <TargetFramework>net5.0</TargetFramework>
        <LangVersion>preview</LangVersion>
    </PropertyGroup>
    <ItemGroup>
        <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="5.0.0-preview.3.20215.2" />
    </ItemGroup>
    <ItemGroup>

dadhi

/* 
sources: 

- http://www.adammil.net/blog/v111_Creating_High-Performance_Locks_and_Lock-free_Code_for_NET_.html
- http://badamczewski.blogspot.com/2012/08/lock-free-and-spinwait-msdn-example.html

A better spin lock:

The result is a spin lock that's quite fast — about twice as fast as locking with a Monitor (or the C# lock statement). 
(It can be further sped up slightly by breaking the Enter method into two methods: Enter, 

dadhi

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net472</TargetFramework>
  </PropertyGroup>

  <PropertyGroup>
    <GeneratedText><![CDATA[
using System%3B

dadhi

using System;
using ImTools;
					
public class Program
{
	public static void Main()
	{
		var map = ImHashMap<string, string>.Empty;
		
		var map1 = map.AddOrUpdate("a", "42");	

dadhi

private DictionarySlim<TypeVal, string> _dict;

public DictionarySlim<TypeVal, string> DictSlim()
{
    var dict = new DictionarySlim<TypeVal, string>();

    foreach (var key in _keys.Take(Count))
        dict.GetOrAddValueRef(key) = "a";

    dict.GetOrAddValueRef(typeof(ImHashMapBenchmarks)) = "!";

dadhi

module EnvDemo

open System
open System.IO

[<Struct>]
type Nothing =
    private
    | Nothing

dadhi

using System;

class Program
{
    // M wants to get an instance via Func
    static void M(Func<string> factory)
    {
        Console.WriteLine(factory());
    }

dadhi

// |       Method |      Mean |     Error |    StdDev |
// |------------- |----------:|----------:|----------:|
// |        Calli | 0.6718 ns | 0.0013 ns | 0.0012 ns |
// |     Delegate | 1.1366 ns | 0.0099 ns | 0.0088 ns |
// | FastDelegate | 1.6239 ns | 0.0103 ns | 0.0097 ns |

// MyClassLib.cs is compiled in another project (havent tested if compiling with Fody is working with BenchmarkDotnet in the same project)
// This file is referencing BenchDelegates.MyClassLib

using System;

dadhi

/*
https://dba.stackexchange.com/questions/96534/postgres-check-disk-space-taken-by-materialized-view?newreg=6b1d58604fce4a1fbe3033ddbb52d7ca

relkind:
r = ordinary table,
i = index,
S = sequence,
v = view,
m = materialized view,
c = composite type,

dadhi

Fun-fun-functional gists in CSharp

Experiment with this gist in Gistlyn.

Let's start with the big guns: Discriminated Union in C#.