CP_PtrBlock Class Reference

Memory allocation class based on pointers. More...

List of all members.

Public Member Functions
Constructor / Destructor
	CP_PtrBlock ()
	Constructor.
	CP_PtrBlock (UInt32 inSize)
	CP_PtrBlock (CP_PtrBlock &inPtrBlock)
	CP_PtrBlock (Ptr inMacPtr, bool inOwnsPtr=true)
	~CP_PtrBlock ()
	Destructor.
Copying
void	CopyTo (void *ioBuffer, UInt32 inNumBytes) const
void	CopyFrom (const void *inBuffer, UInt32 inNumBytes)
Getters
OSPtr	GetOSPtr () const
char *	GetPtr () const
Length
UInt32	Length () const
void	SetLength (UInt32 inLength)
Locking
void	Lock () const
void	Unlock () const
bool	IsLocked () const
Operators
CP_PtrBlock &	operator= (const CP_PtrBlock &inPtrBlock)
	operator Ptr () const
Testers
bool	IsValid () const
bool	OwnsPtr () const
Wrapping
void	Wrap (OSPtr inExistingPtr, bool inOwnsPtr=true)
void	Detach ()
Protected Attributes
OSPtr	fBlock
bool	fOwnsPtr
bool	fLocked
UInt32	fActualBlockLength
Private Member Functions
Allocation
void	Allocate (UInt32 inSize)
void	Deallocate ()

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Detailed Description

A reference counted object to manage blocks of memory using pointers.

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Constructor & Destructor Documentation

CPLAT_Begin_Namespace_CPLAT CP_PtrBlock::CP_PtrBlock (   )

Constructor. Exceptions: none

CP_PtrBlock::CP_PtrBlock (  UInt32  inSize  )  [explicit]

Constructor. Parameters: inSize  The size of the desired memory allocation in bytes. Exceptions: none

CP_PtrBlock::CP_PtrBlock (  CP_PtrBlock &  inPtrBlock  )  [explicit]

Copy constructor. Ownership of the memory block will be handled according to the inOwnershipOptions parameter. Parameters: inPtrBlock  The object to copy. inOwnershipOptions  How to handle ownership of the new and old blocks. Exceptions: none

CP_PtrBlock::CP_PtrBlock (  Ptr  inMacPtr, bool  inOwnsPtr = true )  [explicit]

Constructor. Parameters: inMacPtr  An existing MacOS Ptr to assign to this object. inOwnsHandle  Flag to indicate if this class becomes responsible for the deletion of the OSHandle. Exceptions: none

CP_PtrBlock::~CP_PtrBlock (   )

Destructor. Exceptions: none

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Member Function Documentation

void CP_PtrBlock::CopyTo (  void *  ioBuffer, UInt32  inNumBytes )  const

Copies the passed in number of bytes of this memory block to the passed in destination buffer. The copy will start at the beginning of the memory block. Parameters: ioBuffer  Points to the location the bytes will be copied to. inNumBytes  The number of bytes to copy. Exceptions: none  Returns: void

void CP_PtrBlock::CopyFrom (  const void *  inBuffer, UInt32  inNumBytes )

Copies the passed in number of bytes from the passed in buffer to this block of memory, starting at the first byte of this memory block. Parameters: inBuffer  Points to the location of the bytes to copy from. inNumBytes  The number of bytes to copy. Exceptions: none  Returns: void

OSPtr CP_PtrBlock::GetOSPtr (   )  const

Geturn the memory block.

char * CP_PtrBlock::GetPtr (   )  const

Returns the pointer to the memory block of this object. Will implicitely lock the block, so you'll need to call Unlock() before you can resize the block. Exceptions: none  Returns: char A char * for the memory of this object.

UInt32 CP_PtrBlock::Length (   )  const

Returns the length of this memory block. Exceptions: OSErr  OSErr if there is a problem getting length. Returns: The length of the memory block

void CP_PtrBlock::SetLength (  UInt32  inLength  )

Set the length of the memory block. This will cause the platforms memory block to be resized to accommodate these changes. Parameters: inLength  The length to resize this memory block to. Exceptions: std::bad_alloc  OSError if out of memory or setting length failed because block is locked. OSErr  OSError if setting length failed for other reasons. Returns: void

void CP_PtrBlock::Lock (   )  const

Locks the platforms OSPtr if necessary. Exceptions: none  Returns: void

void CP_PtrBlock::Unlock (   )  const

Unlocks the platforms OSPtr. Exceptions: none  Returns: void

bool CP_PtrBlock::IsLocked (   )  const

Returns true if the memory block is locked. Exceptions: none  Returns: bool Returns true if the memory block is locked.

CP_PtrBlock & CP_PtrBlock::operator= (  const CP_PtrBlock &  inPtrBlock  )

Assignment operator. This will cause the memory of the source block to be copied into a new block. Exceptions: none  Returns: void

CP_PtrBlock::operator Ptr (   )  const

Returns the MacOS Handle. Exceptions: none  Returns: OSHandle

bool CP_PtrBlock::IsValid (   )  const

Returns true if the memory block is not NULL. Exceptions: none  Returns: bool Returns true if the memory block is not NULL.

bool CP_PtrBlock::OwnsPtr (   )  const

Returns true if this object owns the block of memory, and is therefore responsible for its deletion. Otherwise the memory block held by this object will not be deleted by this class. Exceptions: none  Returns: bool Returns true if this object owns the memory handle.

void CP_PtrBlock::Wrap (  OSPtr  inExistingPtr, bool  inOwnsPtr = true )

Wrap ourselves around an existing platforms OSPtr. If inOwnsPtr is true, then this object takes over ownership of the OSPtr and will be responsible for deleting the memory. Parameters: inExistingPtr  The existing OSPtr to take ownership of. inOwnsPtr  Flag to indicate if this class takes on ownership of the handle, and will be responsible for its deletion. Exceptions: none  Returns: void

void CP_PtrBlock::Detach (   )

Notifies this class that it no longer owns the memory, and will not delete it. You are now responsible for deleting the memory to avoid a memory leak. Exceptions: none  Returns: void

void CP_PtrBlock::Allocate (  UInt32  inSize  )  [private]

Private routine to handle the allocation of the platforms memory block. Parameters: inSize  The desired size of the memory allocation. Exceptions: NULL  NULL exception if the memory can't be allocated. Returns: void

void CP_PtrBlock::Deallocate (   )  [private]

Private routine to handle the deallocation of the platforms memory block. This will only happen if this object owns the allocated memory, otherwise you are responsible for the deallocation of the memory. Exceptions: none  Returns: void

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Member Data Documentation

OSPtr CP_PtrBlock::fBlock [protected]

bool CP_PtrBlock::fOwnsPtr [protected]

Platforms memory object.

bool CP_PtrBlock::fLocked [mutable, protected]

Flag to indicate who is responsible for deleting the platforms memory.

UInt32 CP_PtrBlock::fActualBlockLength [protected]

Flag to indicate if the block is locked.

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The documentation for this class was generated from the following files:

• CP_PtrBlock.h
• CP_PtrBlock.cpp

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