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Generic Box in C# for explicit boxing of value types
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#region The MIT License (MIT) | |
// | |
// Copyright (c) 2018 Atif Aziz. All rights reserved. | |
// | |
// Permission is hereby granted, free of charge, to any person obtaining a copy of | |
// this software and associated documentation files (the "Software"), to deal in | |
// the Software without restriction, including without limitation the rights to | |
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of | |
// the Software, and to permit persons to whom the Software is furnished to do so, | |
// subject to the following conditions: | |
// | |
// The above copyright notice and this permission notice shall be included in all | |
// copies or substantial portions of the Software. | |
// | |
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS | |
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR | |
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER | |
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
// | |
#endregion | |
using System; | |
using System.Collections.Generic; | |
using System.Diagnostics; | |
public static class Box | |
{ | |
public static Box<T> Create<T>(T value) where T : struct => new Box<T>(value); | |
} | |
[DebuggerDisplay("{" + nameof(_value) + "}")] | |
partial class Box<T> : IEquatable<Box<T>>, IEquatable<T> where T : struct | |
{ | |
readonly T _value; | |
public Box(T value) => _value = value; | |
public bool Equals(Box<T> other) => | |
!(other is null) && (ReferenceEquals(this, other) || Equals(other._value)); | |
public bool Equals(T other) => | |
EqualityComparer<T>.Default.Equals(other, _value); | |
public override bool Equals(object obj) | |
=> obj is Box<T> box && Equals(box) | |
|| obj is T t && Equals(t); | |
public override int GetHashCode() => _value.GetHashCode(); | |
public static bool Equals(Box<T> left, Box<T> right) | |
=> left is null && right is null | |
|| left is Box<T> lb && lb.Equals(right) | |
|| right.Equals(left); | |
public override string ToString() => _value.ToString(); | |
public static bool Equals(Box<T> left, T right) | |
=> left is Box<T> lb && lb.Equals(right); | |
public static bool Equals(Box<T> left, T? right) | |
=> left is null && right is null | |
|| left is Box<T> a && right is T b && a.Equals(b); | |
public static implicit operator T(Box<T> box) => box._value; | |
public static implicit operator Box<T>(T value) => Box.Create(value); | |
public static bool operator ==(Box<T> left, Box<T> right) => Equals(left, right); | |
public static bool operator !=(Box<T> left, Box<T> right) => !Equals(left, right); | |
public static bool operator ==(Box<T> left, T right) => Equals(left, right); | |
public static bool operator !=(Box<T> left, T right) => !Equals(left, right); | |
public static bool operator ==(Box<T> left, T? right) => Equals(left, right); | |
public static bool operator !=(Box<T> left, T? right) => !Equals(left, right); | |
} |
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