Monify

Monify, a .NET Roslyn source generator, automates the creation of strongly-typed wrappers around single values, improving semantic clarity, type safety, and maintainability.

Requirements

• C# v2.0 or later.
• Visual Studio 2022 v17.4 or later, or any compatible IDE that supports Roslyn source generators.

Installation

To install Monify, use the following command in your package manager console:

install-package Monify

Usage

Monify turns a class, record, or struct into a strongly typed wrapper around a single value. To opt in, annotate a partial type with the Monify attribute and specify the encapsulated value type.

using Monify;

[Monify<int>]
public partial struct Age;

For language versions earlier than C# 11:

using Monify;

[Monify(Type = typeof(int))]
public partial struct Age;

Generated Members

When applied, Monify generates the boilerplate needed for a lightweight value object:

• A private readonly field _value that stores the encapsulated value.
• A constructor accepting the underlying value: Age(int value).
• Implicit conversion operators to and from the encapsulated type.
• Implementations of IEquatable<Age> and IEquatable<int>.
• Equality (==) and inequality (!=) operators for comparing with other instances or with the underlying value.
• Overrides of Equals(object), GetHashCode(), and ToString().

Example

Age age = 42;       // implicit conversion from int
int value = age;    // implicit conversion to int

if (age == value)
{
    // comparisons work with both Age and int
}

Classes annotated with Monify are sealed automatically to preserve immutability. Types must be partial and cannot declare additional state; the included analyzers will warn when these guidelines are not followed.

Analyzers

Monify includes several analyzers to assist engineers with its usage. These are:

Rule ID	Category	Severity	Notes
MONFY01	Usage	Warning	Type is not compatible with Monify
MONFY02	Usage	Warning	Type is not Partial
MONFY03	Design	Error	Type captures State
MONFY04	Design	Error	Self Referencing Type

Contributing

Contributions are welcome - see the CONTRIBUTING.md file for details.

License

This project is licensed under the MIT License - see the LICENSE.md file for details.