ArrayBuilder.cs

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using System.Reflection;
 
namespace System.Collections.Generic;
 
[DefaultMember("Item")]
internal struct ArrayBuilder<T>
{
    private T[] _array;
 
    private int _count;
 
    public ArrayBuilder(int capacity)
    {
        this = default(System.Collections.Generic.ArrayBuilder<T>);
        if (capacity > 0)
        {
            _array = new T[capacity];
        }
    }
 
    public T[] ToArray()
    {
        if (_count == 0)
        {
            return Array.Empty<T>();
        }
        T[] array = _array;
        if (_count < array.Length)
        {
            array = new T[_count];
            Array.Copy(_array, array, _count);
        }
        return array;
    }
 
    public void UncheckedAdd(T item)
    {
        _array[_count++] = item;
    }
}