如何在结构上指定 maxExclusive？

发布于 2024-08-03 09:53:23 字数 810 浏览 5 评论 0原文

我想为 GPX 库创建一个结构 Degrees 。在 GPX 的 XSD 中 (GPX 1.1 Schema) DegreesType 定义为 minInclusive = 0 和 maxExclusive = 360。结构现在应有两个公共静态字段 MinValue = 0 和 MaxValue = x：

public struct Degrees : IFormattable, IComparable, IComparable<Degrees>, IEquatable<Degrees>
{
    private decimal value;

    public static Degrees MinValue = 0M;
    //public static Degrees MaxValue = x;
}

指定 x 值的最佳方法是什么？ 360D-1 是不准确的，360D-0.001 是一种假设，没有人想要比 1/1000 度更好的精度。

原文

I want to create a structure Degrees for a GPX library. In the XSD for GPX (GPX 1.1 Schema) degreesType is defined as minInclusive = 0 and maxExclusive = 360. The structure now shall have two public static fields MinValue = 0 and MaxValue = x:

public struct Degrees : IFormattable, IComparable, IComparable<Degrees>, IEquatable<Degrees>
{
    private decimal value;

    public static Degrees MinValue = 0M;
    //public static Degrees MaxValue = x;
}

What is the best way to specify the value of x? 360D-1 would be to inaccurate, 360D-0.001 would be an assumption that no one ever wants a better accuracy than 1/1000 degree.

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友谊不毕业 2024-08-10 09:53:23

我可以想到两种方法：

让你的结构忠实地代表
指定范围的事实
具有包容性最小值和
独占最大；即，给你的
结构体 MinInclusive 和 MaxExclusive
成员。这可能被视为
教你的结构太多
XSD 的实现细节，
尽管
将MaxValue定义为小于360的最高可表示decimal值。由于decimal是十进制浮点类型，因此我们必须这里有点小心，但我认为我的说法是对的，因为最小的可能值是10^-28，并且对于 360，我们有 10 的 2 次方小数点左边，相关值为 360 - 10^-26 或
```
const 小数 MaxValue = 359.99999999999999999999999999m;
```
我假设您正在处理从十进制到度的转换。请注意，decimal 的类型声明字符为 m 或 M - d 或 D > 代表 double。

I can think of two approaches:

Have your struct faithfully represent
the fact that the range is specified
with an inclusive minimum and an
exclusive maximum; ie, give your
struct MinInclusive and MaxExclusive
members. This might be regarded as
teaching your struct too much about
the implementation detail of the XSD,
though
Define MaxValue as the highest representable decimal value less than 360. Since decimal is a decimal floating point type, we have to be a little careful here, but I think I'm right in saying that since the smallest possible value is 10^-28, and with 360 we have two powers of ten to the left of the decimal point, the relevant value is 360 - 10^-26, or
```
const decimal MaxValue = 359.99999999999999999999999999m;
```
I assume you're taking care of the conversion from decimal to Degree. Note that the type declaration character for decimal is m or M - d or D is for double.