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https://github.com/DevTeam/Immutype
Immutability is easy!
https://github.com/DevTeam/Immutype
csharp-sourcegenerator dotnet functional functional-programming immutability
Last synced: about 2 months ago
JSON representation
Immutability is easy!
- Host: GitHub
- URL: https://github.com/DevTeam/Immutype
- Owner: DevTeam
- License: mit
- Created: 2021-11-18T16:01:14.000Z (almost 3 years ago)
- Default Branch: master
- Last Pushed: 2024-07-22T13:18:57.000Z (2 months ago)
- Last Synced: 2024-07-22T21:31:50.239Z (2 months ago)
- Topics: csharp-sourcegenerator, dotnet, functional, functional-programming, immutability
- Language: C#
- Homepage:
- Size: 160 KB
- Stars: 40
- Watchers: 1
- Forks: 2
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
- RSCG_Examples - https://github.com/DevTeam/Immutype
- csharp-source-generators - Immutype -   - generates extension methods to support immutability. (Source Generators / Functional Programming)
README
# Immutype
[](https://www.nuget.org/packages/Immutype)
[](LICENSE)
[/statusIcon)
](http://teamcity.jetbrains.com/viewType.html?buildTypeId=OpenSourceProjects_DevTeam_Immutype_BuildAndTestBuildType&guest=1)
_Immutype_ is [.NET code generator](https://docs.microsoft.com/en-us/dotnet/csharp/roslyn-sdk/source-generators-overview) creating extension methods for records, structures, and classes marked by the attribute `````[Immutype.Target]````` to efficiently operate with instances of these types like with immutable ones.
For instance, for the type Foo for the constructor parameter *__values__* of type ```IEnumerable``` following extension methods are generated:
- ```Foo WithValues(this Foo it, params int[] values)``` - to replace values by the new ones using a method with variable number of arguments
- ```Foo WithValues(this Foo it, IEnumerable values)``` - to replace values by the new ones
- ```Foo AddValues(this Foo it, params int[] values)``` - to add values using a method with variable number of arguments
- ```Foo AddValues(this Foo it, IEnumerable values)``` - to add values
- ```Foo RemoveValues(this Foo it, params int[] values)``` - to remove values using a method with variable number of arguments
- ```Foo RemoveValues(this Foo it, IEnumerable values)``` - to remove values
- ```Foo ClearValues(this Foo it)``` - to clear all values
For the type Foo for the constructor parameter *__value__* of other types, like ```int```, with default value ```99``` following extension methods are generated:
- ```Foo WithValue(this Foo it, int value)``` - to replace a value by the new one
- ```Foo WithDefaultValue(this Foo it)``` - to replace a value by the default value *__99__*
The extensions methods above are generating automatically for each ```public``` or ```internal``` type, like *__Foo__* marked by the attribute ```[Immutype.Target]``` in the static class named as *__FooExtensions__*. This generated class *__FooExtensions__* is static, has the same accessibility level and the same namespace like a target class *__Foo__*. Each generated static extension method has two attributes:
- ```[MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]``` - to improve performance
- ```[Pure]``` - to indicate that this method is pure, that is, it does not make any visible state changes
_Immutype_ supports nullable [reference](https://docs.microsoft.com/en-us/dotnet/csharp/nullable-references) and [value](https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/builtin-types/nullable-value-types) types and the following list of enumerable types:
- Arrays
- ```IEnumerable```
- ```List```
- ```IList```
- ```IReadOnlyCollection```
- ```IReadOnlyList```
- ```ICollection```
- ```HashSet```
- ```ISet```
- ```Queue```
- ```Stack```
- ```IReadOnlyCollection```
- ```IReadOnlyList```
- ```IReadOnlySet```
- ```ImmutableList```
- ```IImmutableList```
- ```ImmutableArray```
- ```ImmutableQueue```
- ```IImmutableQueue```
- ```ImmutableStack```
- ```IImmutableStack```
_Immutype_ supports [IIncrementalGenerator](https://docs.microsoft.com/en-us/dotnet/api/microsoft.codeanalysis.iincrementalgenerator) as well as [ISourceGenerator](https://docs.microsoft.com/en-us/dotnet/api/microsoft.codeanalysis.isourcegenerator) so it works quite effective.
## NuGet package
[](https://www.nuget.org/packages/Immutype)
- Package Manager
```
Install-Package Immutype
```
- .NET CLI
```
dotnet add package Immutype
```
## Development environment requirements
- [.NET SDK 5.0.102+](https://dotnet.microsoft.com/download/dotnet/5.0)
- [C# v.6 or newer](https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-version-history#c-version-40)
## Supported frameworks
- [.NET and .NET Core](https://docs.microsoft.com/en-us/dotnet/core/) 1.0+
- [.NET Standard](https://docs.microsoft.com/en-us/dotnet/standard/net-standard) 1.0+
- [.NET Framework](https://docs.microsoft.com/en-us/dotnet/framework/) 3.5+
- [UWP/XBOX](https://docs.microsoft.com/en-us/windows/uwp/index)
- [.NET IoT](https://dotnet.microsoft.com/apps/iot)
- [Xamarin](https://dotnet.microsoft.com/apps/xamarin)
- [.NET Multi-platform App UI (MAUI)](https://docs.microsoft.com/en-us/dotnet/maui/)
## Usage Scenarios
- Basics
- [Sample scenario](#sample-scenario)
- [Array](#array)
- [Applying defaults](#applying-defaults)
- [Clearing](#clearing)
- [Immutable collection](#immutable-collection)
- [Removing](#removing)
- [Generic types](#generic-types)
- [Nullable collection](#nullable-collection)
- [Set](#set)
- [Record with constructor](#record-with-constructor)
- [Explicit constructor choice](#explicit-constructor-choice)
### Sample scenario
``` CSharp
[Immutype.Target]
internal record Person(
string Name,
bool HasPassport = true,
int Age = 0,
ImmutableArray Friends = default);
public class SampleScenario
{
public void Run()
{
var john = new Person("John", false, 15)
.AddFriends(
new Person("David").WithAge(16),
new Person("James").WithAge(17)
.WithFriends(new Person("Tyler").WithAge(16)));
john.Friends.Length.ShouldBe(2);
john = john.WithAge(16).WithDefaultHasPassport();
john.Age.ShouldBe(16);
john.HasPassport.ShouldBeTrue();
john = john.AddFriends(
new Person("Daniel").WithAge(17),
new Person("Sophia").WithAge(18));
john.Friends.Length.ShouldBe(4);
john = john.RemoveFriends(new Person("David").WithAge(16));
john.Friends.Length.ShouldBe(3);
}
}
```
### Array
``` CSharp
[Immutype.Target]
internal readonly record struct Person(string Name, int Age = 0, params Person[] Friends);
public class Array
{
public void Run()
{
var john = new Person("John")
.WithAge(15)
.AddFriends(new Person("David").WithAge(16))
.AddFriends(
new Person("James"),
new Person("Daniel").WithAge(17));
john.Friends.Length.ShouldBe(3);
}
}
```
### Applying defaults
``` CSharp
[Immutype.Target]
internal readonly record struct Person(string Name = "John", int Age = 17);
public class ApplyingDefaults
{
public void Run()
{
var john = new Person("David", 15)
.WithDefaultAge()
.WithDefaultName();
john.Name.ShouldBe("John");
john.Age.ShouldBe(17);
}
}
```
### Clearing
``` CSharp
[Immutype.Target]
internal readonly record struct Person(
string Name,
int Age = 0,
params Person[] Friends);
public class Clearing
{
public void Run()
{
var john = new Person("John",15, new Person("David").WithAge(16))
.AddFriends(new Person("James"));
john = john.ClearFriends();
john.Friends.Length.ShouldBe(0);
}
}
```
### Immutable collection
``` CSharp
[Immutype.Target]
internal readonly struct Person
{
public readonly string Name;
public readonly int Age;
public readonly IImmutableList Friends;
public Person(
string name,
int age = 0,
IImmutableList? friends = default)
{
Name = name;
Age = age;
Friends = friends ?? ImmutableList.Empty;
}
};
public class ImmutableCollection
{
public void Run()
{
var john = new Person("John",15)
.WithFriends(
new Person("David").WithAge(16),
new Person("James").WithAge(17))
.AddFriends(
new Person("David").WithAge(22));
john.Friends.Count.ShouldBe(3);
}
}
```
### Removing
``` CSharp
[Immutype.Target]
internal readonly record struct Person(
string Name,
int Age = 0,
params Person[] Friends);
public class Removing
{
public void Run()
{
var john = new Person("John",15, new Person("David").WithAge(16))
.AddFriends(new Person("James"));
john = john.RemoveFriends(new Person("James"));
john.Friends.Length.ShouldBe(1);
}
}
```
### Generic types
It is possible to use generic types including any generic constraints.
``` CSharp
[Immutype.Target]
internal record Person(string Name, TAge Age = default, IEnumerable>? Friends = default)
where TAge : struct;
public class GenericTypes
{
public void Run()
{
var john = new Person("John")
.WithAge(15)
.WithFriends(new Person("David").WithAge(16))
.AddFriends(
new Person("James"),
new Person("Daniel").WithAge(17));
john.Friends?.Count().ShouldBe(3);
}
}
```
### Nullable collection
``` CSharp
[Immutype.Target]
internal record Person(
string Name,
int? Age = default,
ICollection? Friends = default);
public class NullableCollection
{
public void Run()
{
var john = new Person("John",15)
.AddFriends(
new Person("David").WithAge(16),
new Person("James").WithAge(17)
.WithFriends(new Person("Tyler").WithAge(16)));
john.Friends?.Count.ShouldBe(2);
}
}
```
### Set
``` CSharp
[Immutype.Target]
internal record Person(
string Name,
int Age = 0,
ISet? Friends = default);
public class Set
{
public void Run()
{
var john = new Person("John",15)
.AddFriends(
new Person("David").WithAge(16),
new Person("David").WithAge(16),
new Person("James").WithAge(17)
.WithFriends(new Person("Tyler").WithAge(16)));
john.Friends?.Count.ShouldBe(2);
}
}
```
### Record with constructor
``` CSharp
[Immutype.Target]
internal record Person
{
public Person(
string name,
int? age = default,
ICollection? friends = default)
{
Name = name;
Age = age;
Friends = friends;
}
public string Name { get; }
public int? Age { get; }
public ICollection? Friends { get; }
public void Deconstruct(
out string name,
out int? age,
out ICollection? friends)
{
name = Name;
age = Age;
friends = Friends;
}
}
public class RecordWithConstructor
{
public void Run()
{
var john = new Person("John",15)
.WithFriends(
new Person("David").WithAge(16),
new Person("James").WithAge(17)
.WithFriends(new Person("Tyler").WithAge(16)));
john.Friends?.Count.ShouldBe(2);
}
}
```
### Explicit constructor choice
``` CSharp
[Immutype.Target]
internal readonly struct Person
{
public readonly string Name;
public readonly int Age;
public readonly IImmutableList Friends;
// You can explicitly select a constructor by marking it with the [Immutype.Target] attribute
[Immutype.Target]
public Person(
string name,
int age = 0,
IImmutableList? friends = default)
{
Name = name;
Age = age;
Friends = friends ?? ImmutableList.Empty;
}
public Person(
string name,
int age,
IImmutableList? friends,
int someArg = 99)
{
Name = name;
Age = age;
Friends = friends ?? ImmutableList.Empty;
}
};
public class ExplicitConstructorChoice
{
public void Run()
{
var john = new Person("John",15)
.WithFriends(
new Person("David").WithAge(16),
new Person("James").WithAge(17))
.AddFriends(
new Person("David").WithAge(22));
john.Friends.Count.ShouldBe(3);
}
}
```