Unity Preconditions Class

Preconditions.cs

using System;

public class Preconditions {
    Preconditions() { }
    
    public static T CheckNotNull<T>(T reference) {
        return CheckNotNull(reference, null);
    }

    public static T CheckNotNull<T>(T reference, string message) {
        // Can find OrNull Extension Method (and others) here: https://github.com/adammyhre/Unity-Utils
        if (reference is UnityEngine.Object obj && obj.OrNull() == null) {
            throw new ArgumentNullException(message);
        }
        if (reference is null) {
            throw new ArgumentNullException(message);
        }
        return reference;
    }

    public static void CheckState(bool expression) {
        CheckState(expression, null);
    }

    public static void CheckState(bool expression, string messageTemplate, params object[] messageArgs) {
        CheckState(expression, string.Format(messageTemplate, messageArgs));
    }

    public static void CheckState(bool expression, string message) {
        if (expression) {
            return;
        }

        throw message == null ? new InvalidOperationException() : new InvalidOperationException(message);
    }
}