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GeezerVison is showing github.com — bytecode-api/BytecodeApi/Undefinable.cs at master · bytecode77/bytecode-api

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Undefinable.cs

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namespace BytecodeApi;
/// <summary>
/// Represents a value type that can be assigned an undefined value.
/// </summary>
/// <typeparam name="T">The type of the underlying value.</typeparam>
public readonly struct Undefinable<T> : IEquatable<Undefinable<T>>
{
/// <summary>
/// Represents an undefined value.
/// </summary>
public static readonly Undefinable<T> Undefined = new();
private readonly T _Value;
/// <summary>
/// Gets a <see cref="bool" /> value indicating, whether this value is defined, or undefined.
/// </summary>
public bool IsDefined { get; }
/// <summary>
/// Gets the underlying value. An exception is thrown, if <see cref="IsDefined" /> is <see langword="false" />.
/// </summary>
public T Value => IsDefined ? _Value : throw Throw.InvalidOperation("Value is undefined.");
/// <summary>
/// Initializes a new instance of the <see cref="Undefinable{T}" /> structure to the specified value.
/// </summary>
/// <param name="value">The value to be assigned.</param>
public Undefinable(T value)
{
IsDefined = true;
_Value = value;
}
/// <summary>
/// Returns a <see cref="string" /> that represents this instance.
/// </summary>
/// <returns>
/// A <see cref="string" /> that represents this instance.
/// </returns>
public override string ToString()
{
return !IsDefined ? "Undefined" : _Value == null ? "null" : _Value.ToString() ?? "";
}
/// <summary>
/// Determines whether the specified <see cref="object" /> is equal to this instance.
/// </summary>
/// <param name="obj">The <see cref="object" /> to compare with this instance.</param>
/// <returns>
/// <see langword="true" />, if the specified <see cref="object" /> is equal to this instance;
/// otherwise, <see langword="false" />.
/// </returns>
public override bool Equals([NotNullWhen(true)] object? obj)
{
return obj is Undefinable<T> undefinable && Equals(undefinable);
}
/// <summary>
/// Determines whether this instance is equal to another <see cref="Undefinable{T}" />.
/// </summary>
/// <param name="other">The <see cref="Undefinable{T}" /> to compare to this instance.</param>
/// <returns>
/// <see langword="true" />, if this instance is equal to the <paramref name="other" /> parameter;
/// otherwise, <see langword="false" />.
/// </returns>
public bool Equals(Undefinable<T> other)
{
return IsDefined == other.IsDefined && EqualityComparer<T>.Default.Equals(_Value, other._Value);
}
/// <summary>
/// Returns a hash code for this <see cref="Undefinable{T}" />.
/// </summary>
/// <returns>
/// The hash code for this <see cref="Undefinable{T}" /> instance.
/// </returns>
public override int GetHashCode()
{
return HashCode.Combine(IsDefined, _Value);
}
/// <summary>
/// Compares two <see cref="Undefinable{T}" /> values for equality.
/// </summary>
/// <param name="a">The first <see cref="Undefinable{T}" /> to compare.</param>
/// <param name="b">The second <see cref="Undefinable{T}" /> to compare.</param>
/// <returns>
/// <see langword="true" />, if both <see cref="Undefinable{T}" /> values are equal;
/// otherwise, <see langword="false" />.
/// </returns>
public static bool operator ==(Undefinable<T> a, Undefinable<T> b)
{
return Equals(a, b);
}
/// <summary>
/// Compares two <see cref="Undefinable{T}" /> values for inequality.
/// </summary>
/// <param name="a">The first <see cref="Undefinable{T}" /> to compare.</param>
/// <param name="b">The second <see cref="Undefinable{T}" /> to compare.</param>
/// <returns>
/// <see langword="true" />, if both <see cref="Undefinable{T}" /> values are not equal;
/// otherwise, <see langword="false" />.
/// </returns>
public static bool operator !=(Undefinable<T> a, Undefinable<T> b)
{
return !(a == b);
}
/// <summary>
/// Defines an implicit conversion of a value to a <see cref="Undefinable{T}" />.
/// </summary>
/// <param name="value">The value to convert.</param>
public static implicit operator Undefinable<T>(T value)
{
return new(value);
}
/// <summary>
/// Defines an explicit conversion of a <see cref="Undefinable{T}" /> to its underlying value type.
/// An exception is thrown, if <see cref="IsDefined" /> is <see langword="false" />.
/// </summary>
/// <param name="value">The <see cref="Undefinable{T}" /> to convert.</param>
public static explicit operator T(Undefinable<T> value)
{
return value.Value;
}
}
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