[−][src]Struct cpp_core::CppBox
An owning pointer to a C++ object.
CppBox
is automatically used in places where C++ class objects are passed by value
and in return values of constructors because the ownership is apparent in these cases.
However, sometimes an object is returned as a pointer but you must accept the ownership
of the object. It's not possible to automatically determine ownership semantics
of C++ code in this case, so you should manually convert Ptr
to CppBox
using to_box
method.
When CppBox
is dropped, it will automatically delete the object using C++'s delete
operator.
Objects stored in CppBox
are usually placed on the heap by the C++ code.
If a C++ API accepts an object by pointer and takes ownership of it, it's not possible to
automatically detect this, so you must manually convert CppBox
to a non-owning Ptr
using into_ptr
before passing it to such a function.
&CppBox<T>
and &mut CppBox<T>
implement operator traits and delegate them
to the corresponding C++ operators.
This means that you can use &box1 + value
to access the object's operator+
.
CppBox
implements Deref
and DerefMut
, allowing to call the object's methods
directly. In addition, methods of the object's first base class are also directly available
thanks to nested Deref
implementations.
If the object provides an iterator interface through begin()
and end()
functions,
&CppBox<T>
and &mut CppBox<T>
will implement IntoIterator
,
so you can iterate on them directly.
Safety
It's not possible to automatically track the ownership of objects possibly managed by C++
libraries. The user must ensure that the object is alive while CppBox
exists and that
no pointers to the object are used after the object is deleted
by CppBox
's Drop
implementation. Note that with CppBox
,
it's possible to call unsafe C++ code without using any more unsafe code, for example, by
using operator traits or simply dropping the box, so care should be taken when exposing
CppBox
in a safe interface.
Methods
impl<T: CppDeletable> CppBox<T>
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pub unsafe fn new(ptr: MutPtr<T>) -> Option<Self>
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Encapsulates the object into a CppBox
. Returns None
if the pointer is null.
The same operation can be done by calling to_box
function on MutPtr
.
You should use this function only for
pointers that were created on C++ side and passed through
a FFI boundary to Rust. An object created with C++ new
must be deleted using C++ delete
, which is executed by CppBox
.
Do not use this function for objects that would be deleted by other means.
If another C++ object is the owner of the passed object,
it will attempt to delete it. If CppBox
containing the object still exists,
it would result in a double deletion, which must never happen.
Use CppBox::into_ptr
to unwrap the pointer before passing it to
a function that takes ownership of the object.
Safety
The pointer must point to an object that can be
safely deleted using C++'s delete
operator.
The object must not be deleted by other means while CppBox
exists.
Any other pointers to the object must not be used after CppBox
is dropped.
pub unsafe fn from_raw(ptr: *mut T) -> Option<Self>
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Encapsulates the object into a CppBox
. Returns None
if the pointer is null.
See CppBox::new
for more information.
Safety
The pointer must point to an object that can be
safely deleted using C++'s delete
operator.
The object must not be deleted by other means while CppBox
exists.
Any other pointers to the object must not be used after CppBox
is dropped.
impl<T: CppDeletable> CppBox<T>
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pub unsafe fn as_ptr(&self) -> Ptr<T>
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Returns a constant pointer to the value in the box.
Safety
This operation is safe as long as self
is valid.
pub unsafe fn as_mut_ptr(&mut self) -> MutPtr<T>
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Returns a mutable pointer to the value in the box.
Safety
This operation is safe as long as self
is valid.
pub fn as_mut_raw_ptr(&mut self) -> *mut T
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Returns a constant raw pointer to the value in the box.
pub fn as_raw_ptr(&self) -> *const T
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Returns a mutable raw pointer to the value in the box.
pub fn into_raw_ptr(self) -> *mut T
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Destroys the box without deleting the object and returns a raw pointer to the content. The caller of the function becomes the owner of the object and should ensure that the object will be deleted at some point.
pub unsafe fn into_ptr(self) -> MutPtr<T>
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Destroys the box without deleting the object and returns a pointer to the content. The caller of the function becomes the owner of the object and should ensure that the object will be deleted at some point.
Safety
This operation is safe as long as self
is valid.
pub unsafe fn as_ref(&self) -> Ref<T>
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Returns a constant reference to the value in the box.
Safety
This operation is safe as long as self
is valid.
pub unsafe fn as_mut_ref(&mut self) -> MutRef<T>
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Returns a mutable reference to the value in the box.
Safety
This operation is safe as long as self
is valid.
pub unsafe fn static_upcast<U>(&self) -> Ref<U> where
T: StaticUpcast<U>,
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T: StaticUpcast<U>,
Returns a non-owning reference to the content converted to the base class type U
.
CppBox
retains the ownership of the object.
Safety
This operation is safe as long as self
is valid.
pub unsafe fn static_downcast<U>(&self) -> Ref<U> where
T: StaticDowncast<U>,
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T: StaticDowncast<U>,
Returns a non-owning reference to the content converted to the derived class type U
.
CppBox
retains the ownership of the object.
It's recommended to use dynamic_cast
instead because it performs a checked conversion.
Safety
This operation is safe as long as self
is valid and it's type is U
or inherits from U
.
pub unsafe fn dynamic_cast<U>(&self) -> Option<Ref<U>> where
T: DynamicCast<U>,
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T: DynamicCast<U>,
Returns a non-owning reference to the content converted to the derived class type U
.
CppBox
retains the ownership of the object. Returns None
if the object's type is not U
and doesn't inherit U
.
Safety
This operation is safe as long as self
is valid.
pub unsafe fn static_upcast_mut<U>(&mut self) -> MutRef<U> where
T: StaticUpcast<U>,
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T: StaticUpcast<U>,
Returns a non-owning reference to the content converted to the base class type U
.
CppBox
retains the ownership of the object.
Safety
This operation is safe as long as self
is valid.
pub unsafe fn static_downcast_mut<U>(&mut self) -> MutRef<U> where
T: StaticDowncast<U>,
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T: StaticDowncast<U>,
Returns a non-owning reference to the content converted to the derived class type U
.
CppBox
retains the ownership of the object.
It's recommended to use dynamic_cast
instead because it performs a checked conversion.
Safety
This operation is safe as long as self
is valid and it's type is U
or inherits from U
.
pub unsafe fn dynamic_cast_mut<U>(&mut self) -> Option<MutRef<U>> where
T: DynamicCast<U>,
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T: DynamicCast<U>,
Returns a non-owning reference to the content converted to the derived class type U
.
CppBox
retains the ownership of the object. Returns None
if the object's type is not U
and doesn't inherit U
.
Safety
This operation is safe as long as self
is valid.
Trait Implementations
impl<'a, T, U: CppDeletable> CastFrom<&'a CppBox<U>> for Ptr<T> where
U: StaticUpcast<T>,
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U: StaticUpcast<T>,
impl<'a, T, U: CppDeletable> CastFrom<&'a mut CppBox<U>> for MutPtr<T> where
U: StaticUpcast<T>,
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U: StaticUpcast<T>,
impl<'a, T, U: CppDeletable> CastFrom<&'a CppBox<U>> for Ref<T> where
U: StaticUpcast<T>,
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U: StaticUpcast<T>,
impl<'a, T, U: CppDeletable> CastFrom<&'a mut CppBox<U>> for MutRef<T> where
U: StaticUpcast<T>,
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U: StaticUpcast<T>,
impl<T: CppDeletable> Drop for CppBox<T>
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Deletes the stored object using C++'s delete
operator.
impl<'a, T, T1, T2> IntoIterator for &'a CppBox<T> where
T: CppDeletable + Begin<Output = CppBox<T1>> + End<Output = CppBox<T2>>,
T1: CppDeletable + PartialEq<Ref<T2>> + Indirection + Increment,
T2: CppDeletable,
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T: CppDeletable + Begin<Output = CppBox<T1>> + End<Output = CppBox<T2>>,
T1: CppDeletable + PartialEq<Ref<T2>> + Indirection + Increment,
T2: CppDeletable,
type Item = <T1 as Indirection>::Output
The type of the elements being iterated over.
type IntoIter = CppIterator<T1, T2>
Which kind of iterator are we turning this into?
fn into_iter(self) -> Self::IntoIter
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impl<'a, T, T1, T2> IntoIterator for &'a mut CppBox<T> where
T: CppDeletable + BeginMut<Output = CppBox<T1>> + EndMut<Output = CppBox<T2>>,
T1: CppDeletable + PartialEq<Ref<T2>> + Indirection + Increment,
T2: CppDeletable,
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T: CppDeletable + BeginMut<Output = CppBox<T1>> + EndMut<Output = CppBox<T2>>,
T1: CppDeletable + PartialEq<Ref<T2>> + Indirection + Increment,
T2: CppDeletable,
type Item = <T1 as Indirection>::Output
The type of the elements being iterated over.
type IntoIter = CppIterator<T1, T2>
Which kind of iterator are we turning this into?
fn into_iter(self) -> Self::IntoIter
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impl<T: CppDeletable, U> PartialEq<U> for CppBox<T> where
T: PartialEq<U>,
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T: PartialEq<U>,
impl<T: CppDeletable, U> PartialOrd<U> for CppBox<T> where
T: Lt<U> + Le<U> + Gt<U> + Ge<U> + PartialEq<U>,
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T: Lt<U> + Le<U> + Gt<U> + Ge<U> + PartialEq<U>,
fn partial_cmp(&self, other: &U) -> Option<Ordering>
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fn lt(&self, other: &U) -> bool
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fn le(&self, other: &U) -> bool
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fn gt(&self, other: &U) -> bool
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fn ge(&self, other: &U) -> bool
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impl<T: CppDeletable> Debug for CppBox<T>
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impl<'a, T: CppDeletable, U> Div<U> for &'a CppBox<T> where
&'a T: Div<U>,
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&'a T: Div<U>,
type Output = <&'a T as Div<U>>::Output
The resulting type after applying the /
operator.
fn div(self, rhs: U) -> Self::Output
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impl<'a, T: CppDeletable, U> Rem<U> for &'a CppBox<T> where
&'a T: Rem<U>,
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&'a T: Rem<U>,
type Output = <&'a T as Rem<U>>::Output
The resulting type after applying the %
operator.
fn rem(self, rhs: U) -> Self::Output
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impl<'a, T: CppDeletable, U> Sub<U> for &'a CppBox<T> where
&'a T: Sub<U>,
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&'a T: Sub<U>,
type Output = <&'a T as Sub<U>>::Output
The resulting type after applying the -
operator.
fn sub(self, rhs: U) -> Self::Output
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impl<'a, T: CppDeletable, U> Add<U> for &'a CppBox<T> where
&'a T: Add<U>,
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&'a T: Add<U>,
type Output = <&'a T as Add<U>>::Output
The resulting type after applying the +
operator.
fn add(self, rhs: U) -> Self::Output
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impl<'a, T: CppDeletable, U> Mul<U> for &'a CppBox<T> where
&'a T: Mul<U>,
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&'a T: Mul<U>,
type Output = <&'a T as Mul<U>>::Output
The resulting type after applying the *
operator.
fn mul(self, rhs: U) -> Self::Output
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impl<T: CppDeletable, U> AddAssign<U> for CppBox<T> where
T: AddAssign<U>,
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T: AddAssign<U>,
fn add_assign(&mut self, rhs: U)
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impl<T: CppDeletable, U> SubAssign<U> for CppBox<T> where
T: SubAssign<U>,
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T: SubAssign<U>,
fn sub_assign(&mut self, rhs: U)
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impl<T: CppDeletable, U> MulAssign<U> for CppBox<T> where
T: MulAssign<U>,
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T: MulAssign<U>,
fn mul_assign(&mut self, rhs: U)
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impl<T: CppDeletable, U> DivAssign<U> for CppBox<T> where
T: DivAssign<U>,
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T: DivAssign<U>,
fn div_assign(&mut self, rhs: U)
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impl<T: CppDeletable, U> RemAssign<U> for CppBox<T> where
T: RemAssign<U>,
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T: RemAssign<U>,
fn rem_assign(&mut self, rhs: U)
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impl<'a, T: CppDeletable, U> BitAnd<U> for &'a CppBox<T> where
&'a T: BitAnd<U>,
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&'a T: BitAnd<U>,
type Output = <&'a T as BitAnd<U>>::Output
The resulting type after applying the &
operator.
fn bitand(self, rhs: U) -> Self::Output
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impl<'a, T: CppDeletable, U> BitOr<U> for &'a CppBox<T> where
&'a T: BitOr<U>,
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&'a T: BitOr<U>,
type Output = <&'a T as BitOr<U>>::Output
The resulting type after applying the |
operator.
fn bitor(self, rhs: U) -> Self::Output
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impl<'a, T: CppDeletable, U> BitXor<U> for &'a CppBox<T> where
&'a T: BitXor<U>,
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&'a T: BitXor<U>,
type Output = <&'a T as BitXor<U>>::Output
The resulting type after applying the ^
operator.
fn bitxor(self, rhs: U) -> Self::Output
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impl<'a, T: CppDeletable, U> Shl<U> for &'a CppBox<T> where
&'a T: Shl<U>,
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&'a T: Shl<U>,
type Output = <&'a T as Shl<U>>::Output
The resulting type after applying the <<
operator.
fn shl(self, rhs: U) -> Self::Output
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impl<'a, T: CppDeletable, U> Shr<U> for &'a CppBox<T> where
&'a T: Shr<U>,
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&'a T: Shr<U>,
type Output = <&'a T as Shr<U>>::Output
The resulting type after applying the >>
operator.
fn shr(self, rhs: U) -> Self::Output
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impl<T: CppDeletable, U> BitAndAssign<U> for CppBox<T> where
T: BitAndAssign<U>,
[src]
T: BitAndAssign<U>,
fn bitand_assign(&mut self, rhs: U)
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impl<T: CppDeletable, U> BitOrAssign<U> for CppBox<T> where
T: BitOrAssign<U>,
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T: BitOrAssign<U>,
fn bitor_assign(&mut self, rhs: U)
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impl<T: CppDeletable, U> BitXorAssign<U> for CppBox<T> where
T: BitXorAssign<U>,
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T: BitXorAssign<U>,
fn bitxor_assign(&mut self, rhs: U)
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impl<T: CppDeletable, U> ShlAssign<U> for CppBox<T> where
T: ShlAssign<U>,
[src]
T: ShlAssign<U>,
fn shl_assign(&mut self, rhs: U)
[src]
impl<T: CppDeletable, U> ShrAssign<U> for CppBox<T> where
T: ShrAssign<U>,
[src]
T: ShrAssign<U>,
fn shr_assign(&mut self, rhs: U)
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impl<T: CppDeletable> Deref for CppBox<T>
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Allows to call member functions of T
and its base classes directly on the pointer.
impl<T: CppDeletable> DerefMut for CppBox<T>
[src]
Allows to call member functions of T
and its base classes directly on the pointer.
Auto Trait Implementations
impl<T> !Send for CppBox<T>
impl<T> !Sync for CppBox<T>
impl<T> Unpin for CppBox<T>
impl<T> UnwindSafe for CppBox<T> where
T: RefUnwindSafe,
T: RefUnwindSafe,
impl<T> RefUnwindSafe for CppBox<T> where
T: RefUnwindSafe,
T: RefUnwindSafe,
Blanket Implementations
impl<T, U> Into<U> for T where
U: From<T>,
[src]
U: From<T>,
impl<T> From<T> for T
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,