40 lines
868 B
C#
40 lines
868 B
C#
using System;
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public struct MemoizedToString<TInput, TToString> where TInput : IEquatable<TInput> where TToString : struct, IToStringImplementation<TInput>
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{
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private TInput lastInput;
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private string lastOutput;
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private TToString implementation;
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private static readonly MemoizedToString<TInput, TToString> defaultValue;
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public string GetString(in TInput input)
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{
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if (!input.Equals(lastInput))
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{
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lastInput = input;
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lastOutput = implementation.DoToString(in lastInput);
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}
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return lastOutput;
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}
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public static MemoizedToString<TInput, TToString> GetNew()
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{
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return defaultValue;
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}
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static MemoizedToString()
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{
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TInput input = default(TInput);
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TToString val = default(TToString);
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defaultValue = new MemoizedToString<TInput, TToString>
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{
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lastInput = input,
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lastOutput = val.DoToString(in input),
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implementation = val
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};
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}
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}
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