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SGI Developer Toolbox 6.1
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SGI Developer Toolbox 6.1 - Disc 4.iso
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fax
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util
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Ptr.h
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1994-08-01
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/* $Header: /usr/people/sam/fax/util/RCS/Ptr.h,v 1.5 1994/02/28 14:23:53 sam Rel $ */
/*
* Copyright (c) 1990, 1991, 1992, 1993, 1994 Sam Leffler
* Copyright (c) 1991, 1992, 1993, 1994 Silicon Graphics, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee, provided
* that (i) the above copyright notices and this permission notice appear in
* all copies of the software and related documentation, and (ii) the names of
* Sam Leffler and Silicon Graphics may not be used in any advertising or
* publicity relating to the software without the specific, prior written
* permission of Sam Leffler and Silicon Graphics.
*
* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
*
* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#ifndef _Ptr_
#define _Ptr_
#include "Obj.h"
/******************************
What the declaration of a fxPtr class looks like to the user:
class fxPtr<T> : public fxPtr<> {
fxPtr<T>();
fxPtr<T>(<T>* obj);
fxPtr<T>(const fxPtr<T>& other);
~fxPtr<T>();
fxPtr<T>& operator=(const fxPtr<T>& other);
fxPtr<T>& operator=(<T>* obj);
operator <T>*();
<T>* operator->();
};
******************************/
#define fxDECLARE_Ptr(TYPE) \
class fxCAT(TYPE,Ptr) {/*XXX*/ \
protected: \
void destroy() { if (p) p->dec(); } \
TYPE* p; \
public: \
fxCAT(TYPE,Ptr)() { p = 0; } \
fxCAT(TYPE,Ptr)(TYPE *tp) { p = tp ? (tp->inc(),tp) : 0; } \
fxCAT(TYPE,Ptr)(const fxCAT(TYPE,Ptr)& other) \
{ p = other.p ? (other.p->inc(),other.p) : 0; } \
~fxCAT(TYPE,Ptr)() { destroy(); } \
fxCAT(TYPE,Ptr)& operator=(const fxCAT(TYPE,Ptr)& other) { \
if (p != other.p) { \
destroy(); p = other.p ? (other.p->inc(),other.p) : 0; \
} \
return *this; \
} \
fxCAT(TYPE,Ptr)& operator=(TYPE* tp) { \
if (p != tp) { \
destroy(); p = tp ? (tp->inc(),tp) : 0; \
} \
return *this; \
} \
int compare(const fxCAT(TYPE,Ptr) *other) const \
{ return int((char *)p - (char *)other->p); } \
operator TYPE*() { return p; } \
operator const TYPE*() const { return p; } \
TYPE* operator ->() { return p; } \
const TYPE* operator ->() const { return p; } \
} \
__enddef__
#endif /* _Ptr_ */