opdel.cpp

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C++ 代码 · 共 87 行

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*
*                            Open Watcom Project
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// OPDEL.CPP - default ::delete operator definition
//
// 92/05/15  -- G.R.Bentz       -- defined
// 93/09/22  -- A.F.Scian       -- some CAD/CAM packages (like AutoCad) do not
//                                 implement free() properly so that it can
//                                 accept NULL pointers
// 95/08/12  -- Greg Bentz      -- add _WPRTLINK
// 96/04/10  -- Greg Bentz      -- add layer of indirection for DLL library
//
// Note: _WPRTLINK is present here so that the entry point is
//      exported, but it is not present in new.h so that
//      the entry point can be replaced in the user code

#include "cpplib.h"
#include "lock.h"
#include <malloc.h>
#if defined(__MAKE_DLL_CPPLIB)
  #define __SW_BR
#endif
#include <new.h>
#if defined(__MAKE_DLL_CPPLIB)
  #undef __SW_BR
#endif

#if defined(__MAKE_DLL_CPPLIB)
static void __do_delete( void *p )
#else
_WPRTLINK void operator delete( // RELEASE STORAGE
    void *p )                   // -- storage to release
#endif
{
    if( p != NULL ) {
        free( p );
    }
}

#if defined(__MAKE_DLL_CPPLIB)
static _PVV __pfn_delete = &__do_delete;

_WPRTLINK extern _PVV _set_op_delete( _PVV od ) {
    _PVV old;
    _RWD_StaticInitSema.p();
    old = __pfn_delete;
    __pfn_delete = od;
    _RWD_StaticInitSema.v();
    return( old );
}

_WPRTLINK void operator delete( // RELEASE STORAGE
    void *p )                   // -- storage to release
{
    (*__pfn_delete)( p );
}
#endif