public Int64 Add([NotNull] T item)
{
if (item is null)
{
throw new ArgumentNullException(nameof(item));
}
return(Internal.AddOrUpdate(item, 1, Increment));
}
public Boolean TryAdd([NotNull] T item, out Int64 count)
{
if (item is null)
{
throw new ArgumentNullException(nameof(item));
}
try
{
count = Internal.AddOrUpdate(item, 1, Increment);
return(true);
}
catch (OverflowException)
{
count = default;
return(false);
}
}
public Boolean Remove([NotNull] T item, out Int64 count)
{
if (item is null)
{
throw new ArgumentNullException(nameof(item));
}
lock (Internal)
{
if (!Internal.TryGetValue(item, out count))
{
return(false);
}
if (count <= 1)
{
return(Internal.TryRemove(item, out count));
}
count = Internal.AddOrUpdate(item, 0, Decrement);
return(count > 0);
}
}