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//
// Copyright (c) ZeroC, Inc. All rights reserved.
//
namespace Ice
{
using System;
using System.Collections.Generic;
using System.Runtime.Serialization;
public struct NoneType
{
}
/// <summary>
/// Encapsulates an optional value. Instances of this type are immutable.
/// </summary>
[Serializable]
public struct Optional<T> : ISerializable
{
/// <summary>
/// Creates an optional value whose state is unset.
/// </summary>
public Optional(NoneType none)
{
_value = default(T);
_isSet = false;
}
/// <summary>
/// Creates an optional value and sets its value to the given argument.
/// </summary>
public Optional(T v)
{
_value = v;
_isSet = true;
}
/// <summary>
/// Creates an optional value whose state is copied from the given argument.
/// </summary>
public Optional(Optional<T> v)
{
_value = v._value;
_isSet = v._isSet;
}
/// <summary>
/// Initializes a new instance of the exception with serialized data.
/// </summary>
/// <param name="info">Holds the serialized object data about the exception being thrown.</param>
/// <param name="context">Contains contextual information about the source or destination.</param>
public Optional(SerializationInfo info, StreamingContext context)
{
_isSet = info.GetBoolean("isSet");
if(_isSet)
{
_value = (T)info.GetValue("value", typeof(T));
}
else
{
_value = default(T);
}
}
/// <summary>
/// Conversion operator to the underlying type; a cast is required. An exception
/// is raised if no value is set.
/// </summary>
/// <returns>The encapsulated value.</returns>
/// <exception cref="System.InvalidOperationException">Thrown if no value is set.</exception>
public static explicit operator T(Optional<T> v)
{
return v.Value;
}
/// <summary>
/// Conversion operator from a value of the underlying type; no cast is required.
/// </summary>
public static implicit operator Optional<T>(T v)
{
return new Optional<T>(v);
}
/// <summary>
/// Conversion operator from a None value; no cast is required.
/// </summary>
public static implicit operator Optional<T>(NoneType v)
{
return new Optional<T>();
}
/// <summary>
/// Reads and writes the encapsulated value.
/// </summary>
/// <exception cref="System.InvalidOperationException">Thrown if the property is read and no value is
/// set.</exception>
public T Value
{
get
{
if(!_isSet)
{
throw new InvalidOperationException();
}
return _value;
}
}
/// <summary>
/// Determines whether a value is set.
/// </summary>
/// <returns>True if a value is set, false otherwise.</returns>
public bool HasValue
{
get
{
return _isSet;
}
}
public override bool Equals(object other)
{
if(other == null)
{
return false;
}
try
{
Optional<T> o2 = (Optional<T>)other;
if(_isSet != o2._isSet)
{
return false;
}
else if(_isSet)
{
EqualityComparer<T> comparer = EqualityComparer<T>.Default;
return comparer.Equals(_value, o2._value);
}
return true;
}
catch(System.Exception)
{
return false;
}
}
public override int GetHashCode()
{
if(!_isSet)
{
return base.GetHashCode();
}
else
{
return _value.GetHashCode();
}
}
/// <summary>
/// Serializes an optional value.
/// </summary>
/// <param name="info">Holds the serialized object data about the exception being thrown.</param>
/// <param name="context">Contains contextual information about the source or destination.</param>
public void GetObjectData(SerializationInfo info, StreamingContext context)
{
info.AddValue("isSet", _isSet);
if(_isSet)
{
info.AddValue("value", _value, typeof(T));
}
}
private T _value;
private bool _isSet;
}
/// <summary>
/// The optional format.
///
/// An optional value is encoded with a specific optional format. This optional
/// format describes how the data is encoded and how it can be skipped by the
/// unmarshaling code if the optional is not known to the receiver.
/// </summary>
public enum OptionalFormat
{
F1 = 0,
F2 = 1,
F4 = 2,
F8 = 3,
Size = 4,
VSize = 5,
FSize = 6,
Class = 7
}
}
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