Initial commit

.gitignore

@@ -0,0 +1,5 @@
+bin/
+obj/
+/packages/
+riderModule.iml
+/_ReSharper.Caches/

.idea/.idea.ln.patterns/.idea/.gitignore

@@ -0,0 +1,13 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Rider ignored files
+/modules.xml
+/.idea.ln.patterns.iml
+/projectSettingsUpdater.xml
+/contentModel.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/.idea.ln.patterns/.idea/encodings.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding" addBOMForNewFiles="with BOM under Windows, with no BOM otherwise" />
+</project>

.idea/.idea.ln.patterns/.idea/indexLayout.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="UserContentModel">
+    <attachedFolders />
+    <explicitIncludes />
+    <explicitExcludes />
+  </component>
+</project>

.idea/.idea.ln.patterns/.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

ln.patterns.sln

@@ -0,0 +1,16 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ln.patterns", "ln.patterns\ln.patterns.csproj", "{BDF0FA7E-E280-4B0B-BCE8-9A3B8DF72BF0}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{BDF0FA7E-E280-4B0B-BCE8-9A3B8DF72BF0}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{BDF0FA7E-E280-4B0B-BCE8-9A3B8DF72BF0}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{BDF0FA7E-E280-4B0B-BCE8-9A3B8DF72BF0}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{BDF0FA7E-E280-4B0B-BCE8-9A3B8DF72BF0}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

ln.patterns/Optional.cs

@@ -0,0 +1,74 @@
+namespace ln.patterns;
+
+public class Optional<T>
+{
+    private readonly T _value;
+    private readonly Exception? _exception;
+    
+    public Optional(T value)
+    {
+        _value = value;
+    }
+
+    public Optional(Exception? exception)
+    {
+        _exception = exception;
+    }
+
+    public bool TryGetValue(out T value)
+    {
+        value = _value;
+        return _exception is null;
+    }
+
+    public bool TryGetException(out Exception? exception)
+    {
+        exception = _exception;
+        return _exception is not null;
+    }
+
+    public Exception? Exception
+    {
+        get
+        {
+            if (_exception is null)
+                throw new NullReferenceException();
+            return _exception;
+        }
+    }
+    public T Value
+    {
+        get
+        {
+            if (_exception is null)
+                return _value;
+            throw new NullReferenceException();
+        }
+    }
+
+    public bool Is<ET>() where ET : Exception => _exception is ET;
+    public bool Is<ET>(out ET? exception) where ET : Exception
+    {
+        if (_exception is ET)
+        {
+            exception = _exception as ET;
+            return true;
+        }
+
+        exception = null;
+        return false;
+    }
+    public ET? As<ET>() where ET : Exception => _exception as ET;
+
+    public bool Valid => _exception is null;
+    
+    public static implicit operator bool(Optional<T> o) => o._exception is null;
+    public static implicit operator Optional<T>(Exception? e)
+    {
+        return new Optional<T>(e);
+    }
+    public static implicit operator Optional<T>(T value)
+    {
+        return new Optional<T>(value);
+    }
+}

ln.patterns/ln.patterns.csproj

@@ -0,0 +1,13 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <RepositoryUrl>https://nexus.l--n.de/repository/ln.net/</RepositoryUrl>
+        <UserSecretsId>e910e63e-c2c5-4d40-a00b-bd7c6461757e</UserSecretsId>
+        <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
+        <Version>0.1.0-preview6</Version>
+        <TargetFrameworks>net6.0;net7.0</TargetFrameworks>
+    </PropertyGroup>
+
+</Project>