77 lines
1.6 KiB
C#
77 lines
1.6 KiB
C#
using System.Diagnostics.CodeAnalysis;
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namespace Nub.Lang.Common;
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public readonly struct Optional
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{
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public static Optional<TValue> Empty<TValue>() => new();
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/// <summary>
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/// Alias for creating an Optional<TValue> which allows for implicit types
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/// </summary>
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/// <param name="value"></param>
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/// <typeparam name="TValue"></typeparam>
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/// <returns></returns>
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public static Optional<TValue> OfNullable<TValue>(TValue? value)
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{
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return value ?? Optional<TValue>.Empty();
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}
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}
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public readonly struct Optional<TValue>
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{
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public static Optional<TValue> Empty() => new();
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public static Optional<TValue> OfNullable(TValue? value)
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{
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return value ?? Empty();
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}
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public Optional()
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{
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Value = default;
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HasValue = false;
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}
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public Optional(TValue value)
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{
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Value = value;
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HasValue = true;
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}
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public TValue? Value { get; }
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[MemberNotNullWhen(true, nameof(Value))]
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public bool HasValue { get; }
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[MemberNotNullWhen(true, nameof(Value))]
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public bool TryGetValue([NotNullWhen(true)] out TValue? value)
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{
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if (HasValue)
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{
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value = Value;
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return true;
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}
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value = default;
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return false;
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}
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public TValue GetValue()
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{
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return Value ?? throw new InvalidOperationException("Value is not set");
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}
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public static implicit operator Optional<TValue>(TValue value) => new(value);
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public TValue Or(TValue other)
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{
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if (HasValue)
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{
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return Value;
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}
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return other;
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}
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} |