IndexOf() [8/8]

int System.Collections.Immutable.ImmutableArray< T >.IndexOf ( T item, int startIndex, int count, IEqualityComparer< T >? equalityComparer )

inline

Implements System.Collections.Immutable.IImmutableList< T >.

Definition at line 953 of file ImmutableArray.cs.

    {
        ImmutableArray<T> immutableArray = this;
        immutableArray.ThrowNullRefIfNotInitialized();
        if (count == 0 && startIndex == 0)
        {
            return -1;
        }
        Requires.Range(startIndex >= 0 && startIndex < immutableArray.Length, "startIndex");
        Requires.Range(count >= 0 && startIndex + count <= immutableArray.Length, "count");
        equalityComparer = equalityComparer ?? EqualityComparer<T>.Default;
        if (equalityComparer == EqualityComparer<T>.Default)
        {
            return Array.IndexOf(immutableArray.array, item, startIndex, count);
        }
        for (int i = startIndex; i < startIndex + count; i++)
        {
            if (equalityComparer.Equals(immutableArray.array[i], item))
            {
                return i;
            }
        }
        return -1;
    }

References System.count, System.Default, System.Array.IndexOf(), System.item, System.Collections.Immutable.Requires.Range(), and System.startIndex.