[−][src]Trait cpp_core::StaticUpcast
Converts a class pointer to a base class pointer.
A null pointer is always converted to a null pointer. Otherwise, the provided pointer must be valid.
It's recommended to perform the conversion by calling static_upcast
method on pointer types (CppBox, Ptr, Ref)
instead of importing the trait directly.
Provides access to C++ static_cast conversion from derived class to base class.
The conversion in opposite direction can be done with StaticDowncast.
If T1 class is derived (in C++) from T2 class (directly or indirectly),
StaticUpcast<T2> is implemented for T1.
The implementation is generated by ritual automatically.
Note that Rust functions associated with this trait have runtime overhead.
In C++, static_cast is usually a no-op if there is no multiple inheritance,
and multiple inheritance requires pointer adjustment. However, Rust compiler
and ritual do not have any information about these implementation details,
so all calls of static_cast are wrapper in FFI functions.
Required methods
unsafe fn static_upcast(ptr: Ptr<Self>) -> Ptr<T>
Convert type of a const pointer.
Safety
This operation is safe as long as ptr is either valid or null.