mathnet-numerics/lib/Gallio_3.0.6.787/samples/MbUnit/MbUnit.Samples/ContractVerifiers/Comparison/SampleComparable.cs

// Copyright 2005-2009 Gallio Project - http://www.gallio.org/
// Portions Copyright 2000-2004 Jonathan de Halleux
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
//     http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

using System;
using MbUnit.Framework;
using MbUnit.Framework.ContractVerifiers;

namespace MbUnit.Samples.ContractVerifiers.Comparison
{
    public class SampleComparable : IComparable<SampleComparable>
    {
        private int value;

        public SampleComparable(int value)
        {
            this.value = value;
        }

        public int CompareTo(SampleComparable other)
        {
            return Object.ReferenceEquals(other, null) 
                ? Int32.MaxValue 
                : value.CompareTo(other.value);
        }

        public static bool operator >=(SampleComparable left, SampleComparable right)
        {
            return (Object.ReferenceEquals(left, null) 
                && Object.ReferenceEquals(right, null)) 
                || (!Object.ReferenceEquals(left, null) 
                && (left.CompareTo(right) >= 0));
        }

        public static bool operator <=(SampleComparable left, SampleComparable right)
        {
            return Object.ReferenceEquals(left, null) 
                || (left.CompareTo(right) <= 0);
        }

        public static bool operator >(SampleComparable left, SampleComparable right)
        {
            return !Object.ReferenceEquals(left, null) 
                && (left.CompareTo(right) > 0);
        }

        public static bool operator <(SampleComparable left, SampleComparable right)
        {
            return (!Object.ReferenceEquals(left, null) 
                || !Object.ReferenceEquals(right, null)) 
                && (Object.ReferenceEquals(left, null) 
                || (left.CompareTo(right) < 0));
        }
    }
}