DelegateFunction.cs

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using System;
 
namespace java.util.function
{
 
    public class DelegateFunction<TArg, TResult> : Function
    {
 
        readonly Func<TArg, TResult> _func;
 
        public DelegateFunction(Func<TArg, TResult> func)
        {
            this._func = func ?? throw new ArgumentNullException(nameof(func));
        }
 
        public Function andThen(Function after)
        {
            return Function.__DefaultMethods.andThen(this, after);
        }
 
        public Function compose(Function before)
        {
            return Function.__DefaultMethods.compose(this, before);
        }
 
        public object? apply(object t)
        {
            return _func((TArg)t);
        }
 
    }
 
    public class DelegateFunction<TArg1, TArg2, TResult> : BiFunction
    {
 
        readonly Func<TArg1, TArg2, TResult> _func;
 
        public DelegateFunction(Func<TArg1, TArg2, TResult> func)
        {
            this._func = func ?? throw new ArgumentNullException(nameof(func));
        }
 
        public BiFunction andThen(Function after)
        {
            return BiFunction.__DefaultMethods.andThen(this, after);
        }
 
        public object? apply(object t1, object t2)
        {
            return _func((TArg1)t1, (TArg2)t2);
        }
 
    }
 
}