Source generator for lazy properties and methods

[Rekkonnect]

Overview

Provide a source generator that will make it quicker to define a lazily-instantiable property value. The underlying mechanism may use the provided System.Lazy<T> type. The generator may also support the partial properties feature introduced in C# 13.

This will be an alternative option to Lombok.NET's Lazy generator. The reason being that Lombok forces an irregular structure, instantiating a class instance to hold the value and refer to its instance holding the globally initialized lazy value. It's also less flexible, not conveniently supporting per-instance lazy instances out of the box.

API breakdown

[AttributeUsage(AttributeTargets.Property | AttributeTargets.Method, Inheritable = false, AllowMultiple = false)]
public class LazyAttribute(string methodName) : Attribute
{
    public string MethodName { get; } = methodName;
}

Usage example

public class C
{
    [Lazy(nameof(CalculateHeavyName))]
    public partial string HeavyName { get; }

    // assume heavy calculation here
    private string CalculateHeavyName() => string.Empty;
}

Breaking change?

No

Alternatives

As listed above, Lombok.NET offers a source generator for generating lazily-calculated instances. To avoid conflicts with Lombok's Lazy, we could provide an alternative name to the attribute.

Additional context

No response

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