/// <summary>
/// Searches the set for a given value and returns the equal value it finds, if any.
/// </summary>
/// <param name="value">The value to search for.</param>
/// <param name="valueComparer">The value comparer.</param>
/// <param name="existingValue">The value from the set that the search found, or the original value if the search yielded no match.</param>
/// <returns>
/// A value indicating whether the search was successful.
/// </returns>
internal bool TryExchange(T value, IEqualityComparer <T> valueComparer, out T existingValue)
{
if (!this.IsEmpty)
{
if (valueComparer.Equals(value, _firstValue))
{
existingValue = _firstValue;
return(true);
}
int index = _additionalElements.IndexOf(value, valueComparer);
if (index >= 0)
{
#if !NETSTANDARD1_0
existingValue = _additionalElements.ItemRef(index);
#else
existingValue = _additionalElements[index];
#endif
return(true);
}
}
existingValue = value;
return(false);
}
