#nullable enable

using System;

namespace Python.Runtime

internal PySequence(BorrowedReference reference) : base(reference) { }

internal PySequence(in StolenReference reference) : base(reference) { }

/// <summary>

/// Creates new instance from an existing object.

/// </summary>

/// <exception cref="ArgumentException"><paramref name="o"/> does not provide sequence protocol</exception>

public PySequence(PyObject o) : base(FromObject(o)) { }

static BorrowedReference FromObject(PyObject o)

{

if (o is null) throw new ArgumentNullException(nameof(o));

if (!IsSequenceType(o)) throw new ArgumentException("object is not a sequence");

return o.Reference;

}

/// <summary>

/// Returns <c>true</c> if the given object implements the sequence protocol.