Where can I find the “clamp” function in .NET?

Question

I would like to clamp a value x to a range [a, b]:

x = (x < a) ? a : ((x > b) ? b : x);

This is quite basic

Answer 1

If I want to validate the range of an argument in [min, max], the I use the following handy class:

public class RangeLimit<T> where T : IComparable<T>
{
    public T Min { get; }
    public T Max { get; }
    public RangeLimit(T min, T max)
    {
        if (min.CompareTo(max) > 0)
            throw new InvalidOperationException("invalid range");
        Min = min;
        Max = max;
    }

    public void Validate(T param)
    {
        if (param.CompareTo(Min) < 0 || param.CompareTo(Max) > 0)
            throw new InvalidOperationException("invalid argument");
    }

    public T Clamp(T param) => param.CompareTo(Min) < 0 ? Min : param.CompareTo(Max) > 0 ? Max : param;
}

The class works for all object which are IComparable. I create an instance with a certain range:

RangeLimit<int> range = new RangeLimit<int>(0, 100);

I an either validate an argument

range.Validate(value);

or clamp the argument to the range:

var v = range.Validate(value);

Answer 2

There isn't one, but it's not too hard to make one. I found one here: clamp

It is:

public static T Clamp<T>(T value, T max, T min)
    where T : System.IComparable<T> {
        T result = value;
        if (value.CompareTo(max) > 0)
            result = max;
        if (value.CompareTo(min) < 0)
            result = min;
        return result;
    }

And it can be used like:

int i = Clamp(12, 10, 0); -> i == 10
double d = Clamp(4.5, 10.0, 0.0); -> d == 4.5

Answer 3

There isn't one in the System.Math namespace.

There is a MathHelper Class where it is available for the XNA game studio if that happens to be what you are doing: