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/**************** Block H Declares Source Code File (.H) ***************/
/* Name: BLOCK.H Version 2.0 */
/* */
/* (C) Copyright to the author Olivier BERTRAND 1998 */
/* */
/* This file contains the BLOCK pure virtual class definition. */
/*---------------------------------------------------------------------*/
/* Note: one of the main purpose of this base class is to take care */
/* of the very specific way Plug handles memory allocation. */
/* Instead of allocating small chunks of storage via new or malloc */
/* Plug works in its private memory pool in which it does the sub- */
/* allocation using the function PlugSubAlloc. These are never freed */
/* separately but when a transaction is terminated, the entire pool */
/* is set to empty, resulting in a very fast and efficient allocate */
/* process, no garbage collection problem, and an automatic recovery */
/* procedure (via LongJump) when the memory is exhausted. */
/* For this to work new must be given two parameters, first the */
/* global pointer of the Plug application, and an optional pointer to */
/* the memory pool to use, defaulting to NULL meaning using the Plug */
/* standard default memory pool, example: */
/* tabp = new(g) XTAB("EMPLOYEE"); */
/* allocates a XTAB class object in the standard Plug memory pool. */
/***********************************************************************/
#if !defined(BLOCK_DEFINED)
#define BLOCK_DEFINED
#if defined(WIN32) && !defined(NOEX)
#define DllExport __declspec( dllexport )
#else // !WIN32
#define DllExport
#endif // !WIN32
/***********************************************************************/
/* Definition of class BLOCK with its method function new. */
/***********************************************************************/
typedef class BLOCK *PBLOCK;
class DllExport BLOCK {
public:
void * operator new(size_t size, PGLOBAL g, void *p = NULL) {
#ifdef DEBTRACE
if (debug != NULL)
htrc("New BLOCK: size=%d g=%p p=%p\n", size, g, p);
#endif
return (PlugSubAlloc(g, p, size));
} // end of new
virtual void Print(PGLOBAL, FILE *, uint) {} // Produce file desc
virtual void Print(PGLOBAL, char *, uint) {} // Produce string desc
#if !defined(__BORLANDC__)
// Avoid warning C4291 by defining a matching dummy delete operator
void operator delete(void *, PGLOBAL, void *) {}
#endif
}; // end of class BLOCK
#endif // !BLOCK_DEFINED
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