protected override __Delegate CombineImpl(__Delegate d)
{
var a = new __Delegate[InternalInvocationList.Length + 1];
Array.Copy(InternalInvocationList, a, InternalInvocationList.Length);
a[InternalInvocationList.Length] = d;
InternalInvocationList = a;
return(this);
}
public static __Delegate Remove(__Delegate source, __Delegate value)
{
if (source == null)
{
return(null);
}
if (value == null)
{
return(source);
}
return(source.RemoveImpl(value));
}
public static __Delegate Combine(__Delegate a, __Delegate b)
{
if (a == null)
{
return(b);
}
if (b == null)
{
return(a);
}
return(a.CombineImpl(b));
}
protected override __Delegate RemoveImpl(__Delegate d)
{
var j = -1;
for (int i = 0; i < InternalInvocationList.Length; i++)
{
if (InternalInvocationList[i] == d)
{
j = i;
}
}
if (j >= 0)
{
// removing last element will result in a null delegate
// other languages shall be updated to behave the same...
if (InternalInvocationList.Length == 1)
{
return(null);
}
var a = new __Delegate[InternalInvocationList.Length - 1];
for (int i = 0; i < InternalInvocationList.Length; i++)
{
if (i < j)
{
a[i] = InternalInvocationList[i];
}
else
{
if (i > j)
{
a[i - 1] = InternalInvocationList[i];
}
}
}
InternalInvocationList = a;
}
return(this);
}
protected virtual __Delegate RemoveImpl(__Delegate d)
{
return(default(__Delegate));
}
protected virtual __Delegate CombineImpl(__Delegate d)
{
return(default(__Delegate));
}