DelegateDoubleSupplier.cs

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using System;
 
namespace java.util.function
{
 
    public class DelegateDoubleSupplier : DoubleSupplier
    {
 
        readonly Func<double> _func;
 
        public DelegateDoubleSupplier(Func<double> func)
        {
            _func = func ?? throw new ArgumentNullException(nameof(func));
        }
 
        public double getAsDouble()
        {
            return _func();
        }
 
    }
 
}