/// <summary>
/// Initializes a new instance of the dictionary with the specified
/// initial capacity, the specified eviction, and uses the
/// provide equality comparer for the key type.
/// </summary>
/// <param name="capacity">
/// The initial number of elements that the dictionary can contain before resizing internally.
/// </param>
/// <param name="evictionMode">
/// Specifies whether the most recent or least recent entry is evicted when
/// <see cref="SetAndMaintainCount(TKey, TValue)"/> is called.
/// </param>
/// <param name="comparer">
/// The <see cref="IEqualityComparer{T}"/> implementation to use when comparing keys,
/// or null to use the default comparer for the type of the key.
/// </param>
public RecentDictionary(int capacity, RecentDictionaryEvictionMode evictionMode, IEqualityComparer <TKey> comparer)
{
if (capacity < 0 || capacity > (1 << 30))
{
throw new ArgumentOutOfRangeException(nameof(capacity), capacity, "Capacity must be between 0 and 1,073,741,824 (inclusive)");
}
_comparer = comparer ?? EqualityComparer <TKey> .Default;
_evictMode = evictionMode;
int initialBucketCount;
if (capacity <= 4)
{
initialBucketCount = 8;
}
else
{
initialBucketCount = NextPowerOfTwo(capacity);
}
_buckets = new Node[initialBucketCount];
_bucketMask = initialBucketCount - 1;
}
/// <summary>
/// Initializes a new instance of the dictionary that is empty,
/// uses the specified eviction mode,
/// has the default initial capacity,
/// and uses the default equality comparer for the key type.
/// </summary>
/// <param name="evictionMode">
/// Specifies whether the most recent or least recent entry is evicted when
/// <see cref="SetAndMaintainCount(TKey, TValue)"/> is called.
/// </param>
public RecentDictionary(RecentDictionaryEvictionMode evictionMode) : this(0, evictionMode, null)
{
}