質問編集履歴
4
倍率に誤りがあったので修正
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Math.Pow 0.003 秒
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for 0.47
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for 0.047 秒
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コードの修正
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```C#
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using System;
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using UnityEngine.Assertions;
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public sealed class ItemPrice
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{
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double Load(int level, long startPrice, double priceRate)
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public static double Load(int level, long startPrice, double priceRate)
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{
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double Upgrade(double currentPrice, double rate) => currentPrice * rate;
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public static double Upgrade(double currentPrice, double priceRate) => currentPrice * priceRate;
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}
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2
コードの命名修正
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Level++;
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value = Upd
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value = Upgrade(value, PriceRate);
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}
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double Upd
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double Upgrade(double currentPrice, double rate) => currentPrice * rate;
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}
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1
解決したので追記
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### [追記] 最終的にいただいた意見をすべて混ぜました
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ku__ra__geさん、ikadzuchiさん、TN8001さん
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ありがとうございました。
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・ 初回ロードでMath.Powを使いキャッシュ
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・ 2回目以降はキャッシュに対して計算する
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Math.Powは重いとのことでしたが、計測したところ今回の使い方では早いので使うことにしました。
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Macbook proにて1万回繰り返した結果
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Math.Pow 0.003 秒
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for 0.477 秒
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**コード全文**
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```C#
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using System;
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using UnityEngine.Assertions;
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public sealed class ItemPrice
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{
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public int Level{ get; private set; }
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public long Value => (long)value;
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public readonly long StartPrice;
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public readonly double PriceRate;
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double value;
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public ItemPrice(int level, long startPrice, double priceRate)
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{
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Assert.IsTrue(level > 0);
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Assert.IsTrue(startPrice > 0);
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Assert.IsTrue(priceRate > 0);
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Level = level;
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StartPrice = startPrice;
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PriceRate = priceRate;
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value = Load(Level, StartPrice, PriceRate);
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}
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public void Upgrade()
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{
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Level++;
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value = Update(value, PriceRate);
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}
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double Load(int level, long startPrice, double priceRate)
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{
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return level > 1 ? startPrice * Math.Pow(priceRate, level - 1) : startPrice;
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}
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double Update(double currentPrice, double rate) => currentPrice * rate;
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}
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```
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1
111
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### 実現したいこと
|
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2
112
|
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3
113
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購入するごとに金額が増えていくアイテムがあります。
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