Nullable Bool And - CSharp System

CSharp examples for System:Nullable

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Description

Nullable Bool And

Demo Code



public class Main{
        internal static bool? And(this bool? left, bool? right)
        {//from  ww  w  .  j  a v  a  2  s.  c o  m
            // three-valued logic 'and' (T = true, F = false, U = unknown)
            //
            //      T & T = T
            //      T & F = F
            //      F & F = F
            //      F & T = F
            //      F & U = F
            //      U & F = F
            //      T & U = U
            //      U & T = U
            //      U & U = U
            bool? result;
            if (left.HasValue
                && right.HasValue)
            {
                result = left.Value && right.Value;
            }
            else if (!left.HasValue
                     && !right.HasValue)
            {
                result = null; // unknown
            }
            else if (left.HasValue)
            {
                result = left.Value
                             ? (bool?)null
                             : // unknown
                         false;
            }
            else
            {
                result = right.Value
                             ? (bool?)null
                             : false;
            }
            return result;
        }
}

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