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// File: Standard_MMgrRoot.hxx
// Created: Tue Mar 15 12:05:43 2005
// Author: Peter KURNEV
// <pkv@irinox>
#ifndef _Standard_MMgrRoot_HeaderFile
#define _Standard_MMgrRoot_HeaderFile
#ifndef _Standard_Address_HeaderFile
#include <Standard_Address.hxx>
#endif
#ifndef _Standard_Integer_HeaderFile
#include <Standard_Integer.hxx>
#endif
#ifndef _Standard_Macro_HeaderFile
#include <Standard_Macro.hxx>
#endif
/**
* Root class for Open CASCADE mmemory managers.
* Defines only abstract interface functions.
*/
class Standard_MMgrRoot
{
public:
//! Virtual destructor; required for correct inheritance
Standard_EXPORT virtual ~Standard_MMgrRoot();
//! Allocate specified number of bytes.
//! The actually allocated space should be rounded up to
//! double word size (4 bytes), as this is expected by implementation
//! of some classes in OCC (e.g. TCollection_AsciiString)
Standard_EXPORT virtual Standard_Address Allocate (const Standard_Size theSize)=0;
//! Reallocate previously allocated memory to contain at least theSize bytes.
//! In case of success, aPtr should be nullified and new pointer returned.
Standard_EXPORT virtual Standard_Address Reallocate (Standard_Address& aPtr,
const Standard_Size theSize)=0;
//! Frees previously allocated memory at specified address.
//! The pointer is nullified.
Standard_EXPORT virtual void Free(Standard_Address& aPtr)=0;
//! Purge internally cached unused memory blocks (if any)
//! by releasing them to the operating system.
//! Must return non-zero if some memory has been actually released,
//! or zero otherwise.
//!
//! If option isDestroyed is True, this means that memory
//! manager is not expected to be used any more; note however
//! that in general case it is still possible to have calls to that
//! instance of memory manager after this (e.g. to free memory
//! of static objects in OCC). Thus this option should
//! command the memory manager to release any cached memory
//! to the system and not cache any more, but still remain operable...
//!
//! Default implementation does nothing and returns 0.
Standard_EXPORT virtual Standard_Integer Purge(Standard_Boolean isDestroyed=Standard_False);
//! Set reentrant mode on or off.
//! Note: This method may be called only when no any other thread can
//! access this object simultaneously.
//! Default implementation does nothing.
Standard_EXPORT virtual void SetReentrant(Standard_Boolean isReentrant);
};
#endif
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