init

src/Common/Mccn.Common.Domain/Abstractions/Result.cs

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+namespace Mccn.Common.Domain.Abstractions;
+
+public class Result
+{
+    protected Result(bool isSuccess, Error error)
+    {
+        if (isSuccess && error != Error.None)
+            throw new InvalidOperationException();
+        if (!isSuccess && error == Error.None)
+            throw new InvalidOperationException();
+
+        IsSuccess = isSuccess;
+        Error = error;
+    }
+
+    public bool IsSuccess { get; }
+    public bool IsFailure => !IsSuccess;
+    public Error Error { get; }
+
+    public static Result Success()
+    {
+        return new Result(true, Error.None);
+    }
+
+    public static Result Failure(Error error)
+    {
+        return new Result(false, error);
+    }
+
+    public static Result<TValue> Success<TValue>(TValue value)
+    {
+        return new Result<TValue>(value, true, Error.None);
+    }
+
+    public static Result<TValue> Failure<TValue>(Error error)
+    {
+        return new Result<TValue>(default, false, error);
+    }
+}
+
+public sealed class Result<TValue> : Result
+{
+    private readonly TValue? _value;
+
+    internal Result(TValue? value, bool isSuccess, Error error) : base(isSuccess, error)
+    {
+        _value = value;
+    }
+
+    public TValue Value => IsSuccess
+        ? _value!
+        : throw new InvalidOperationException("The value of a failure result cannot be accessed.");
+
+    public static implicit operator Result<TValue>(TValue? value)
+    {
+        return value is not null ? Success(value) : Failure<TValue>(Error.NullValue);
+    }
+}