16 lines
460 B
C#
16 lines
460 B
C#
using System;
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using System.Collections.Immutable;
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// Lenses for primitive types and other types that are not
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// interesting to further focus.
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public sealed class LeafLens<T, Whole> : ILens<T, Whole> {
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public readonly System.Func<T, Whole> wrap;
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public readonly T oldHole;
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public LeafLens(System.Func<T, Whole> wrap, T oldHole) {
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this.wrap = wrap;
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this.oldHole = oldHole;
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}
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public Whole Update(Func<T, T> update) => wrap(update(oldHole));
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} |