/// <summary>
/// Constructs a new builder.
/// </summary>
/// <param name="initialize">Pass <c>true</c>.</param>
public SparseArrayBuilder(bool initialize)
: this()
{
// Once C# gains parameterless struct constructors, please
// remove this workaround.
Debug.Assert(initialize);
_builder = new LargeArrayBuilder <T>(initialize: true);
}
/// <summary>Converts an enumerable to an array.</summary>
/// <param name="source">The enumerable to convert.</param>
/// <returns>The resulting array.</returns>
internal static T[] ToArray <T>(IEnumerable <T> source)
{
Debug.Assert(source != null);
if (source is ICollection <T> collection)
{
int count = collection.Count;
if (count == 0)
{
return(Array.Empty <T>());
}
var result = new T[count];
collection.CopyTo(result, arrayIndex: 0);
return(result);
}
var builder = new LargeArrayBuilder <T>(initialize: true);
builder.AddRange(source);
return(builder.ToArray());
}
/// <summary>
/// Constructs a new builder.
/// </summary>
public SparseArrayBuilder()
{
this = default;
_builder = new LargeArrayBuilder <T>();
}