Once.cs (2842B)
1 using Std.Convert; 2 using Std.Maybe; 3 using Std.Ops; 4 using Std.Result; 5 using System; 6 using System.Runtime.InteropServices; 7 #region Namespaces 8 namespace Std.Iter { 9 #region Types 10 [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode, Pack = 0)] 11 public struct Once<T>: IDoubleEndedIterator<T>, IExactSizeIterator<T>, IFusedIterator<T>, IInto<Once<T>> where T: notnull { 12 13 #region Type-level Constructors 14 #endregion 15 16 #region Instance Constructors 17 public Once() => throw new InvalidOperationException("Parameterless constructor is not allowed to be called!"); 18 internal Once(Maybe.IntoIterator<T> iter) => _iter = iter; 19 #endregion 20 21 #region Type-level Fields 22 #endregion 23 24 #region Instance Fields 25 Maybe.IntoIterator<T> _iter; 26 #endregion 27 28 #region Type-level Properties 29 #endregion 30 31 #region Instance Properties 32 #endregion 33 34 #region Type-level Functions 35 #endregion 36 37 #region Instance Functions 38 public Result<Unit, ulong> AdvanceBackBy(ulong n) => IDoubleEndedIterator<T>.AdvanceBackByDefault(ref this, n); 39 public Result<Unit, ulong> AdvanceBy(ulong n) => IIterator<T>.AdvanceByDefault(ref this, n); 40 public ulong Count() => IIterator<T>.CountDefault(ref this); 41 public override readonly bool Equals(object? _) => false; 42 public TInit Fold<TInit>(TInit init, Fn<TInit, T, TInit> f) where TInit: notnull => IIterator<T>.FoldDefault(ref this, init, f); 43 public override readonly int GetHashCode() => 0; 44 public readonly Once<T> Into() => this; 45 public Maybe<T> Last() => IIterator<T>.LastDefault(ref this); 46 public readonly ulong Len() => _iter.Len(); 47 public Maybe<T> Next() => _iter.Next(); 48 public Maybe<T> NextBack() => _iter.NextBack(); 49 public TInit RFold<TInit>(TInit init, Fn<TInit, T, TInit> f) where TInit: notnull => IDoubleEndedIterator<T>.RFoldDefault(ref this, init, f); 50 public readonly Prod<ulong, Maybe<ulong>> SizeHint() => _iter.SizeHint(); 51 public override readonly string ToString() => string.Empty; 52 public Result<TInit, TErr> TryFold<TInit, TErr>(TInit init, Fn<TInit, T, Result<TInit, TErr>> f) where TInit: notnull where TErr: notnull => IIterator<T>.TryFoldDefault(ref this, init, f); 53 readonly Result<Once<T>, Bottom> ITryInto<Once<T>, Bottom>.TryInto() => new(this); 54 public Result<TInit, TErr> TryRFold<TInit, TErr>(TInit init, Fn<TInit, T, Result<TInit, TErr>> f) where TInit: notnull where TErr: notnull => IDoubleEndedIterator<T>.TryRFoldDefault(ref this, init, f); 55 #endregion 56 57 #region Operators 58 #endregion 59 60 #region Types 61 #endregion 62 } 63 #endregion 64 65 #region Namespaces 66 #endregion 67 } 68 #endregion