英文:
How to generate constant values with generic math
问题
以下是翻译的代码部分：
我有以下通用数学函数：
private static T Fade<T>(T t)
where T : IFloatingPoint<T>
{
return t * t * t * (t * (t * 6 - 15) + 10);
}
然而，这不会编译，因为 `6`、`15` 和 `10` 不是类型 `T` 的。
我能想到的最佳解决方案是定义一个静态类，如下所示：
private static class GenericValues<T>
where T : IFloatingPoint<T>
{
public static readonly T Two = T.One + T.One;
public static readonly T Three = Two + T.One;
public static readonly T Four = Three + T.One;
public static readonly T Five = Four + T.One;
public static readonly T Six = Five + T.One;
public static readonly T Ten = Five * Two;
public static readonly T Fifteen = Five * Three;
}
然后该函数变成这样：
private static T Fade<T>(T t)
where T : IFloatingPoint<T>
{
return t * t * t * (t * (t * GenericValues<T>.Six - GenericValues<T>.Fifteen) + GenericValues<T>.Ten);
}
这种方法感觉有点像一个小技巧，是否有更好的方法？
英文:
I have the following generic math function:
private static T Fade<T>(T t)
where T : IFloatingPoint<T>
{
return t * t * t * (t * (t * 6 - 15) + 10);
}
This doesn't compile however, since 6, 15 and 10 are not of type T.
The best solution I could come up with was to define a static class like this:
private static class GenericValues<T>
where T : IFloatingPoint<T>
{
public static readonly T Two = T.One + T.One;
public static readonly T Three = Two + T.One;
public static readonly T Four = Three + T.One;
public static readonly T Five = Four + T.One;
public static readonly T Six = Five + T.One;
public static readonly T Ten = Five * Two;
public static readonly T Fifteen = Five * Three;
}
And then the function becomes this:
private static T Fade<T>(T t)
where T : IFloatingPoint<T>
{
return t * t * t * (t * (t * GenericValues<T>.Six - GenericValues<T>.Fifteen) + GenericValues<T>.Ten);
}
This feels a bit like a hack though, is there a nicer way to do this?
答案1
得分: 9
You can use one of the INumberBase<T>.CreateX methods, for example INumberBase<TSelf>.CreateChecked<TOther>(TOther) to convert the number literals to the generic number type:
private static T Fade<T>(T t)
where T : IFloatingPoint<T>
{
return t * t * t *
(t * (t * T.CreateChecked(6) - T.CreateChecked(15)) + T.CreateChecked(10));
}
英文:
You can use one of the INumberBase<T>.CreateX methods, for example INumberBase<TSelf>.CreateChecked<TOther>(TOther) to convert the number literals to the generic number type:
private static T Fade<T>(T t)
where T : IFloatingPoint<T>
{
return t * t * t *
(t * (t * T.CreateChecked(6) - T.CreateChecked(15)) + T.CreateChecked(10));
}
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