22 lines
976 B
C#
22 lines
976 B
C#
using System;
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using System.Collections.Immutable;
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public sealed class ImmutableListLens<T, Whole> : ILens<ImmutableList<T>, Whole> {
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public readonly Func<ImmutableList<T>, Whole> wrap;
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public readonly ImmutableList<T> oldHole;
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public ImmutableListLens(Func<ImmutableList<T>, Whole> wrap, ImmutableList<T> oldHole) {
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this.wrap = wrap;
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this.oldHole = oldHole;
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}
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// Put methods with the following signature here to focus on sub-parts of the list as needed.
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// public ILens<ImmutableList<T>,Whole> sub-part => oldHole.sub-part.ChainLens(value => oldHole.with-sub-part(value));
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public Whole Update(Func<ImmutableList<T>, ImmutableList<T>> update) => wrap(update(oldHole));
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}
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public static class ImmutableListLensExtensionMethods {
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public static ILens<ImmutableList<string>, Whole> ChainLens<Whole>(this ImmutableList<string> hole, System.Func<ImmutableList<string>, Whole> wrap)
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=> new ImmutableListLens<string, Whole>(wrap: wrap, oldHole: hole);
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} |