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BorrowedReference.cs
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57 lines (48 loc) · 2.15 KB
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namespace Python.Runtime
{
using System;
using System.Diagnostics;
/// <summary>
/// Represents a reference to a Python object, that is being lent, and
/// can only be safely used until execution returns to the caller.
/// </summary>
readonly ref struct BorrowedReference
{
readonly IntPtr pointer;
public bool IsNull => this.pointer == IntPtr.Zero;
/// <summary>Gets a raw pointer to the Python object</summary>
[DebuggerHidden]
public IntPtr DangerousGetAddress()
=> this.IsNull ? throw new NullReferenceException() : this.pointer;
/// <summary>Gets a raw pointer to the Python object</summary>
public IntPtr DangerousGetAddressOrNull() => this.pointer;
public static BorrowedReference Null => new();
/// <summary>
/// Creates new instance of <see cref="BorrowedReference"/> from raw pointer. Unsafe.
/// </summary>
public BorrowedReference(IntPtr pointer)
{
this.pointer = pointer;
}
public static bool operator ==(BorrowedReference a, BorrowedReference b)
=> a.pointer == b.pointer;
public static bool operator !=(BorrowedReference a, BorrowedReference b)
=> a.pointer != b.pointer;
public static bool operator ==(BorrowedReference reference, NullOnly? @null)
=> reference.IsNull;
public static bool operator !=(BorrowedReference reference, NullOnly? @null)
=> !reference.IsNull;
public static bool operator ==(NullOnly? @null, BorrowedReference reference)
=> reference.IsNull;
public static bool operator !=(NullOnly? @null, BorrowedReference reference)
=> !reference.IsNull;
public override bool Equals(object obj) {
if (obj is IntPtr ptr)
return ptr == pointer;
return false;
}
public static implicit operator BorrowedReference(PyObject pyObject) => pyObject.Reference;
public static implicit operator BorrowedReference(NullOnly? @null) => Null;
public override int GetHashCode() => pointer.GetHashCode();
}
}