/// <seealso cref="Monad.Lift{T1, T2, T3, T4, T5, TResult}"/> public static Monad <TResult> ZipWith <T1, T2, T3, T4, T5, TResult>( this Monad <T1> @this, Monad <T2> second, Monad <T3> third, Monad <T4> fourth, Monad <T5> fifth, Func <T1, T2, T3, T4, T5, TResult> zipper) { Require.NotNull(@this, nameof(@this)); Require.NotNull(second, nameof(second)); Require.NotNull(third, nameof(third)); Require.NotNull(fourth, nameof(fourth)); Require.NotNull(fifth, nameof(fifth)); Require.NotNull(zipper, nameof(zipper)); // > return @this.Bind( // > arg1 => second.Bind( // > arg2 => third.Bind( // > arg3 => fourth.Bind( // > arg4 => fifth.Select( // > arg5 => zipper(arg1, arg2, arg3, arg4, arg5)))))); return(@this.Bind( arg1 => second.ZipWith( third, fourth, fifth, (arg2, arg3, arg4, arg5) => zipper(arg1, arg2, arg3, arg4, arg5)))); }
public static Monad <TSource> PassBy <TSource, TOther>( this Monad <TSource> @this, Monad <TOther> other) { Require.NotNull(@this, nameof(@this)); return(@this.ZipWith(other, (arg, _) => arg)); }
public static Monad <TResult> ContinueWith <TSource, TResult>( this Monad <TSource> @this, Monad <TResult> other) { Require.NotNull(@this, nameof(@this)); return(@this.Bind(_ => other)); }
public static Monad <TResult> ReplaceBy <TSource, TResult>( this Monad <TSource> @this, TResult value) { Require.NotNull(@this, nameof(@this)); return(@this.Select(_ => value)); }
/// <seealso cref="Gather{TSource, TResult}" /> public static Monad <TResult> Apply <TSource, TResult>( this Monad <Func <TSource, TResult> > @this, Monad <TSource> value) { Require.NotNull(value, nameof(value)); return(value.Gather(@this)); }
public static Monad <TResult> Select <TSource, TResult>( this Monad <TSource> @this, Func <TSource, TResult> selector) { Require.NotNull(@this, nameof(@this)); Require.NotNull(selector, nameof(selector)); return(@this.Bind(val => Monad <TResult> .η(selector(val)))); }
/// <seealso cref="Apply{TSource, TResult}(Monad{Func{TSource, TResult}}, Monad{TSource})" /> public static Monad <TResult> Gather <TSource, TResult>( this Monad <TSource> @this, Monad <Func <TSource, TResult> > applicative) { Require.NotNull(@this, nameof(@this)); Require.NotNull(applicative, nameof(applicative)); return(applicative.Bind(func => @this.Select(func))); }
// Select() with automatic resource management. public static Monad <TResult> Using <TSource, TResult>( this Monad <TSource> @this, Func <TSource, TResult> selector) where TSource : IDisposable { Require.NotNull(@this, nameof(@this)); Require.NotNull(selector, nameof(selector)); return(@this.Select(val => { using (val) { return selector(val); } })); }
// Bind() with automatic resource management. public static Monad <TResult> Using <TSource, TResult>( this Monad <TSource> @this, Func <TSource, Monad <TResult> > binder) where TSource : IDisposable { Require.NotNull(@this, nameof(@this)); Require.NotNull(binder, nameof(binder)); return(@this.Bind(val => { using (val) { return binder(val); } })); }
// Generalizes both Bind() and ZipWith<T1, T2, TResult>(). public static Monad <TResult> SelectMany <TSource, TMiddle, TResult>( this Monad <TSource> @this, Func <TSource, Monad <TMiddle> > selector, Func <TSource, TMiddle, TResult> resultSelector) { Require.NotNull(@this, nameof(@this)); Require.NotNull(selector, nameof(selector)); Require.NotNull(resultSelector, nameof(resultSelector)); return(@this.Bind( val => selector(val).Select( middle => resultSelector(val, middle)))); }
/// <seealso cref="Monad.Lift{T1, T2, TResult}"/> public static Monad <TResult> ZipWith <T1, T2, TResult>( this Monad <T1> @this, Monad <T2> second, Func <T1, T2, TResult> zipper) { Require.NotNull(@this, nameof(@this)); Require.NotNull(second, nameof(second)); Require.NotNull(zipper, nameof(zipper)); return(@this.Bind( arg1 => second.Select( arg2 => zipper(arg1, arg2)))); }
/// <seealso cref="Monad.Lift{T1, T2, T3, TResult}"/> public static Monad <TResult> ZipWith <T1, T2, T3, TResult>( this Monad <T1> @this, Monad <T2> second, Monad <T3> third, Func <T1, T2, T3, TResult> zipper) { Require.NotNull(@this, nameof(@this)); Require.NotNull(second, nameof(second)); Require.NotNull(third, nameof(third)); Require.NotNull(zipper, nameof(zipper)); // This is the same as: // > return @this.Bind( // > arg1 => second.Bind( // > arg2 => third.Select( // > arg3 => zipper(arg1, arg2, arg3)))); // but faster if ZipWith is locally shadowed. return(@this.Bind( arg1 => second.ZipWith( third, (arg2, arg3) => zipper(arg1, arg2, arg3)))); }
internal static Monad <T> μ(Monad <Monad <T> > square) => square.Bind(Stubs <Monad <T> > .Ident);
public static Monad <unit> Skip <TSource>(this Monad <TSource> @this) { Require.NotNull(@this, nameof(@this)); return(@this.ContinueWith(Monad.Unit)); }
/// <summary> /// Removes one level of structure, projecting its bound value into the outer level. /// </summary> public static Monad <T> Flatten <T>(this Monad <Monad <T> > @this) => Monad <T> .μ(@this);