Struct ComPtr
Synopsis
#include <Source/Falcor/Core/API/Shader.h>
template<typename T>
struct dlldecl ComPtr
Description
Minimal smart pointer for working with COM objects.
Methods
| ComPtr | Initialize to a null pointer. | |
| ~ComPtr | Release reference to the pointed-to object. | |
| attach | Transfer ownership of reference from the caller. | |
| detach | Transfer ownership of reference to the caller. | |
| get | Get the underlying object pointer. | |
| operator T* | Cast to object pointer type. | |
| operator& | ||
| operator* | Dereference underlying pointer. | |
| operator-> | Access members of underlying object. | |
| operator= | Add a new reference to an existing object. | |
| readRef | Get a readable reference suitable for use as a function input argument. | |
| setNull | Clear out object pointer. | |
| swap | Swap pointers with another reference. | |
| writeRef | Get a writable reference suitable for use as a function output argument. |
Source
Lines 38-130 in Source/Falcor/Core/API/Shader.h.
template<typename T>
struct dlldecl ComPtr
{
public:
/// Type of the smart pointer itself
typedef ComPtr ThisType;
/// Initialize to a null pointer.
ComPtr() : mpObject(nullptr) {}
ComPtr(nullptr_t) : mpObject(nullptr) {}
/// Release reference to the pointed-to object.
~ComPtr() { if (mpObject) (mpObject)->Release(); }
/// Add a new reference to an existing object.
explicit ComPtr(T* pObject) : mpObject(pObject) { if (pObject) (pObject)->AddRef(); }
/// Add a new reference to an existing object.
ComPtr(const ThisType& rhs) : mpObject(rhs.mpObject) { if (mpObject) (mpObject)->AddRef(); }
/// Add a new reference to an existing object
T* operator=(T* in)
{
if(in) in->AddRef();
if(mpObject) mpObject->Release();
mpObject = in;
return in;
}
/// Add a new reference to an existing object
const ThisType& operator=(const ThisType& rhs)
{
if(rhs.mpObject) rhs.mpObject->AddRef();
if(mpObject) mpObject->Release();
mpObject = rhs.mpObject;
return *this;
}
/// Transfer ownership of a reference.
ComPtr(ThisType&& rhs) : mpObject(rhs.mpObject) { rhs.mpObject = nullptr; }
/// Transfer ownership of a reference.
ComPtr& operator=(ThisType&& rhs) { T* swap = mpObject; mpObject = rhs.mpObject; rhs.mpObject = swap; return *this; }
/// Clear out object pointer.
void setNull()
{
if( mpObject )
{
mpObject->Release();
mpObject = nullptr;
}
}
/// Swap pointers with another reference.
void swap(ThisType& rhs)
{
T* tmp = mpObject;
mpObject = rhs.mpObject;
rhs.mpObject = tmp;
}
/// Get the underlying object pointer.
T* get() const { return mpObject; }
/// Cast to object pointer type.
operator T*() const { return mpObject; }
/// Access members of underlying object.
T* operator->() const { return mpObject; }
/// Dereference underlying pointer.
T& operator*() { return *mpObject; }
/// Transfer ownership of reference to the caller.
T* detach() { T* ptr = mpObject; mpObject = nullptr; return ptr; }
/// Transfer ownership of reference from the caller.
void attach(T* in) { T* old = mpObject; mpObject = in; if(old) old->Release(); }
/// Get a writable reference suitable for use as a function output argument.
T** writeRef() { setNull(); return &mpObject; }
/// Get a readable reference suitable for use as a function input argument.
T*const* readRef() const { return &mpObject; }
protected:
// Disabled: do not take the address of a smart pointer.
T** operator&();
/// The underlying raw object pointer
T* mpObject;
};