ISignedNumber.cs

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using System.Runtime.Versioning;
 
namespace System;
 
[RequiresPreviewFeatures("Generic Math is in preview.", Url = "https://aka.ms/dotnet-warnings/generic-math-preview")]
public interface ISignedNumber<TSelf> : INumber<TSelf>, IAdditionOperators<TSelf, TSelf, TSelf>, IAdditiveIdentity<TSelf, TSelf>, IComparisonOperators<TSelf, TSelf>, IComparable, IComparable<TSelf>, IEqualityOperators<TSelf, TSelf>, IEquatable<TSelf>, IDecrementOperators<TSelf>, IDivisionOperators<TSelf, TSelf, TSelf>, IIncrementOperators<TSelf>, IModulusOperators<TSelf, TSelf, TSelf>, IMultiplicativeIdentity<TSelf, TSelf>, IMultiplyOperators<TSelf, TSelf, TSelf>, ISpanFormattable, IFormattable, ISpanParseable<TSelf>, IParseable<TSelf>, ISubtractionOperators<TSelf, TSelf, TSelf>, IUnaryNegationOperators<TSelf, TSelf>, IUnaryPlusOperators<TSelf, TSelf> where TSelf : ISignedNumber<TSelf>
{
    static abstract TSelf NegativeOne { get; }
}