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namespace
Python
.
Runtime
{
using
System
;
using
System
.
Diagnostics
.
Contracts
;
/// <summary>
/// Represents a reference to a Python object, that is tracked by Python's reference counting.
/// </summary>
[
NonCopyable
]
ref
struct
NewReference
{
IntPtr
pointer
;
[
Pure
]
public
static
implicit
operator
BorrowedReference
(
in
NewReference
reference
)
=>
new
BorrowedReference
(
reference
.
pointer
)
;
/// <summary>
/// Returns <see cref="PyObject"/> wrapper around this reference, which now owns
/// the pointer. Sets the original reference to <c>null</c>, as it no longer owns it.
/// </summary>
public
PyObject
MoveToPyObject
(
)
{
if
(
this
.
IsNull
(
)
)
throw
new
NullReferenceException
(
)
;
var
result
=
new
PyObject
(
this
.
pointer
)
;
this
.
pointer
=
IntPtr
.
Zero
;
return
result
;
}
/// <summary>
/// Removes this reference to a Python object, and sets it to <c>null</c>.
/// </summary>
public
void
Dispose
(
)
{
if
(
!
this
.
IsNull
(
)
)
Runtime
.
XDecref
(
this
.
pointer
)
;
this
.
pointer
=
IntPtr
.
Zero
;
}
/// <summary>
/// Creates <see cref="NewReference"/> from a raw pointer
/// </summary>
[
Pure
]
public
static
NewReference
DangerousFromPointer
(
IntPtr
pointer
)
=>
new
NewReference
{
pointer
=
pointer
}
;
[
Pure
]
internal
static
IntPtr
DangerousGetAddress
(
in
NewReference
reference
)
=>
IsNull
(
reference
)
?
throw
new
NullReferenceException
(
)
:
reference
.
pointer
;
[
Pure
]
internal
static
bool
IsNull
(
in
NewReference
reference
)
=>
reference
.
pointer
==
IntPtr
.
Zero
;
}
/// <summary>
/// These members can not be directly in <see cref="NewReference"/> type,
/// because <c>this</c> is always passed by value, which we need to avoid.
/// (note <code>this in NewReference</code> vs the usual <code>this NewReference</code>)
/// </summary>
static
class
NewReferenceExtensions
{
/// <summary>Gets a raw pointer to the Python object</summary>
[
Pure
]
public
static
IntPtr
DangerousGetAddress
(
this
in
NewReference
reference
)
=>
NewReference
.
DangerousGetAddress
(
reference
)
;
[
Pure
]
public
static
bool
IsNull
(
this
in
NewReference
reference
)
=>
NewReference
.
IsNull
(
reference
)
;
}
}
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