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Add Array.AsReadOnly and Array.Clear

Tests were added, implementation was missing
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Oliver Booth 2022-04-20 19:24:42 +01:00
parent 108390a415
commit e183c31579
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namespace X10D;
/// <summary>
/// Extension methods for <see cref="Array" />.
/// </summary>
public static class ArrayExtensions
{
/// <summary>
/// Returns a read-only wrapper for the array.
/// </summary>
/// <param name="array">The one-dimensional, zero-based array to wrap in a read-only wrapper.</param>
/// <typeparam name="T">The type of the elements in the array.</typeparam>
/// <returns>A <see cref="IReadOnlyCollection{T}" /> wrapper for the specified array.</returns>
/// <exception cref="ArgumentNullException"><paramref name="array" /> is <see langword="null" />.</exception>
public static IReadOnlyCollection<T> AsReadOnly<T>(this T[] array)
{
if (array is null)
{
throw new ArgumentNullException(nameof(array));
}
return Array.AsReadOnly(array);
}
/// <summary>
/// Clears the contents of an array.
/// </summary>
/// <param name="array">The array to clear.</param>
/// <typeparam name="T">The type of the elements in the array.</typeparam>
/// <exception cref="ArgumentNullException"><paramref name="array" /> is <see langword="null" />.</exception>
public static void Clear<T>(this T?[] array)
{
array.Clear(..);
}
/// <summary>
/// Sets a range of elements in an array to the default value of each element type.
/// </summary>
/// <param name="array">The array whose elements need to be cleared.</param>
/// <param name="range">A range defining the start index and number of elements to clear.</param>
/// <typeparam name="T">The type of the elements in the array.</typeparam>
/// <exception cref="ArgumentNullException"><paramref name="array" /> is <see langword="null" />.</exception>
public static void Clear<T>(this T?[] array, Range range)
{
if (array is null)
{
throw new ArgumentNullException(nameof(array));
}
int index = range.Start.Value;
int end = range.End.Value;
if (range.End.IsFromEnd)
{
end = array.Length - end;
}
array.Clear(index, end - index);
}
/// <summary>
/// Sets a range of elements in an array to the default value of each element type.
/// </summary>
/// <param name="array">The array whose elements need to be cleared.</param>
/// <param name="index">The starting index of the range of elements to clear.</param>
/// <param name="length">The number of elements to clear.</param>
/// <typeparam name="T">The type of the elements in the array.</typeparam>
/// <exception cref="ArgumentNullException"><paramref name="array" /> is <see langword="null" />.</exception>
/// <exception cref="ArgumentOutOfRangeException">
/// <para><paramref name="index" /> is less than the lower bound of <paramref name="array" />.</para>
/// -or-
/// <para><paramref name="length" /> is less zero.</para>
/// -or-
/// <para>The sum of <paramref name="index" /> and <paramref name="length"/> is greater than the size of array.</para>
/// </exception>
public static void Clear<T>(this T?[] array, int index, int length)
{
if (array is null)
{
throw new ArgumentNullException(nameof(array));
}
if (length == 0 || array.Length == 0)
{
return;
}
Array.Clear(array, index, length);
}
}