/// <summary>
/// Tries to allocate an entry in the <see cref="EntryTable{TValue}"/>. Returns <see langword="true"/> if
/// success; otherwise returns <see langword="false"/>.
/// </summary>
/// <param name="index">Index of entry allocated in the table</param>
/// <returns><see langword="true"/> if success; otherwise <see langword="false"/></returns>
public bool TryAllocate(out int index)
{
lock (_allocated)
{
if (_allocated.IsSet(_freeHint))
{
_freeHint = _allocated.FindFirstUnset();
}
if (_freeHint < _table.Length)
{
index = checked (_freeHint++);
_allocated.Set(index);
return(true);
}
}
index = 0;
return(false);
}
/// <summary>
/// Allocates an entry in the <see cref="EntryTable{TEntry}"/>.
/// </summary>
/// <returns>Index of entry allocated in the table</returns>
/// <exception cref="ObjectDisposedException"><see cref="EntryTable{TEntry}"/> instance was disposed</exception>
public int Allocate()
{
if (_disposed)
{
throw new ObjectDisposedException(null);
}
lock (_allocated)
{
if (_allocated.IsSet(_freeHint))
{
_freeHint = _allocated.FindFirstUnset();
}
int index = _freeHint++;
var page = GetPage(index);
_allocated.Set(index);
GetValue(page, index) = default;
return(index);
}
}
