Class TTypeUid

class TTypeUid : public TUid;

Description

Part of the object provider mechanism, this class encapsulates the Uid that identifies the type of object that an object provider is to get.

The class is also used to encapsulate a pointer to the object that the object provider has found.

An object that is intended to be capable of being retrieved by the object provider mechanism must include enum {ETypeId = 0xabcdefgh}; in its class definition, where 0xabcdefgh is the Uid value. The macro DECLARE_TYPE_ID can be used to do this.

An instance of this class is passed to the MObjectProvider::MopSupplyObject(TTypeUid) function implemented by an object provider. A TTypeUid::Ptr is also returned by this function.

Derivation

• TUid - A globally unique 32-bit number.

• TTypeUid - Part of the object provider mechanism, this class encapsulates the Uid that iden...

Members

Defined in TTypeUid:

• MakePtr(T *)constConstructs a TTypeUid::Ptr which encapsulates the specified object pointer.
• Null()Constructs a TTypeUid::Ptr which encapsulates a NULL pointer.
• PtrEncapsulates a pointer to an object fetched by an object provider.
• TTypeUid(TInt)Constructor that takes a Uid value.

Inherited from TUid:

• Name()constGenerates and returns the standard text form of the UID.
• Uid(TInt)Constructs the TUid object from a 32-bit integer.
• iUidThe 32-bit integer UID value.
• operator!=(const TUid &)constCompares two UIDs for inequality.
• operator==(const TUid &)constCompares two UIDs for equality.

See also:

• MObjectProviderAn interface that allows an object to be part of a network of object providers.

inline TTypeUid(TInt aUid);

Description

Constructor that takes a Uid value.

Parameters

TInt aUid The Uid value that defines the type of object that an object provider is to get.

static inline Ptr Null();

Description

Constructs a TTypeUid::Ptr which encapsulates a NULL pointer.

Return value

TTypeUid::Ptr The constructed TTypeUid::Ptr object

inline Ptr MakePtr(T *aT) const;

Description

Constructs a TTypeUid::Ptr which encapsulates the specified object pointer.

Parameters

T *aT A pointer to the object which is to be encapsulated.

Return value

TTypeUid::Ptr The constructed TTypeUid::Ptr object

class Ptr;

Description

Encapsulates a pointer to an object fetched by an object provider.

The class has no public constructor. TTypeUid::MakePtr(T *)const or TTypeUid::Null() must be used to construct instances of this class.

Members

Defined in TTypeUid::Ptr:

• Pointer()constRetrieves the pointer to an object which is encapsulated by the TTypeUid::Ptr.

Member functions

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Pointer()const

inline TAny* Pointer() const;

Description

Retrieves the pointer to an object which is encapsulated by the TTypeUid::Ptr.

Return value

TAny * A pointer to an object.