mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-13 18:27:35 +00:00
139 lines
3.7 KiB
C
139 lines
3.7 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
|
|
*
|
|
* The contents of this file are subject to the Netscape Public License
|
|
* Version 1.0 (the "NPL"); you may not use this file except in
|
|
* compliance with the NPL. You may obtain a copy of the NPL at
|
|
* http://www.mozilla.org/NPL/
|
|
*
|
|
* Software distributed under the NPL is distributed on an "AS IS" basis,
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
|
|
* for the specific language governing rights and limitations under the
|
|
* NPL.
|
|
*
|
|
* The Initial Developer of this code under the NPL is Netscape
|
|
* Communications Corporation. Portions created by Netscape are
|
|
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
|
|
* Reserved.
|
|
*/
|
|
|
|
#ifndef __CAST_H
|
|
#define __CAST_H
|
|
|
|
// To handle casts between the various windows
|
|
// platforms.
|
|
// We use these macros/inline functions instead of just
|
|
// casting directly so that we can manipulate their
|
|
// behaviour on a broad scale, and very customized
|
|
// behaviour can be achieved if you need to range
|
|
// check values in debug mode, etc.
|
|
|
|
// PAY ATTENTION, OR WE'RE ALL DEAD:
|
|
// The use of inline functions is to avoid the over evaluation
|
|
// problem (common to macros) when repeating parameters
|
|
// in doing a computation.
|
|
// i.e.
|
|
// #define EVAL(a) ((a) + (a))
|
|
//
|
|
// EVAL(a *= a + a);
|
|
// However, by using inline function, it is not possible
|
|
// to provide every possible cast operation that macros
|
|
// do cover. This is a known shortfall. Templates were
|
|
// the solution, but it's not clear that we'll ever have
|
|
// a 16 bit compiler which supports templates. You will
|
|
// have to implement each needed cast seperately. You
|
|
// can mostly avoid the problem by using the largest possible
|
|
// data type.
|
|
|
|
// To turn off all casting in the front end which
|
|
// utilizes these macros, define NO_CAST, and get
|
|
// ready for a boatload of warnings.
|
|
//#define NO_CAST
|
|
|
|
|
|
// Now onto the show.
|
|
// GAB 09-13-95
|
|
|
|
|
|
// Native integer cast, good for use in WinAPI calls.
|
|
// In debug, we camp on you if we actually lose bits, as it
|
|
// is ambiguous if we should hold the top limit to MAXINT
|
|
// or if we should just take the lower sizeof(int) bytes
|
|
// and ignore the rest.
|
|
#ifndef NO_CAST
|
|
#ifndef _DEBUG
|
|
#define CASTINT(a) ((int)(a))
|
|
#else
|
|
inline int CASTINT(long a) {
|
|
int b = (int)a;
|
|
|
|
ASSERT(a == (long)b);
|
|
return(b);
|
|
}
|
|
#endif
|
|
#else
|
|
#define CASTINT(a) (a)
|
|
#endif
|
|
|
|
// Native unsigned cast.
|
|
// In debug, we camp on you if we actually lose bits.
|
|
#ifndef NO_CAST
|
|
#ifndef _DEBUG
|
|
#define CASTUINT(a) ((unsigned)(a))
|
|
#else
|
|
inline unsigned CASTUINT(long a) {
|
|
unsigned b = (unsigned)a;
|
|
|
|
ASSERT(a == (long)b);
|
|
return(b);
|
|
}
|
|
#endif
|
|
#else
|
|
#define CASTUINT(a) (a)
|
|
#endif
|
|
|
|
#ifndef NO_CAST
|
|
#ifndef _DEBUG
|
|
#define CASTSIZE_T(a) ((size_t)(a))
|
|
#else
|
|
inline size_t CASTSIZE_T(long a) {
|
|
size_t b = (size_t)a;
|
|
|
|
ASSERT(a == (long)b);
|
|
return(b);
|
|
}
|
|
#endif
|
|
#else
|
|
#define CASTSIZE_T(a) (a)
|
|
#endif
|
|
|
|
#ifndef NO_CAST
|
|
#ifndef _DEBUG
|
|
#define CASTDWORD(a) ((DWORD)(a))
|
|
#else
|
|
inline DWORD CASTDWORD(long a) {
|
|
DWORD b = (DWORD)a;
|
|
|
|
ASSERT(a == (long)b);
|
|
return(b);
|
|
}
|
|
#endif
|
|
#else
|
|
#define CASTDWORD(a) (a)
|
|
#endif
|
|
|
|
// NCAPI data from URL_Struct
|
|
#define NCAPIDATA(pUrl) ((CNcapiUrlData *)(pUrl)->ncapi_data)
|
|
|
|
// Context casts
|
|
#define CX2VOID(pContext, CastFromClassCX) ((void *)((CAbstractCX *)((CastFromClassCX *)(pContext))))
|
|
#define VOID2CX(pVoid, CastToClassCX) ((CastToClassCX *)((CAbstractCX *)((void *)(pVoid))))
|
|
|
|
#define ABSTRACTCX(pXPCX) ((pXPCX)->fe.cx)
|
|
#define BOOKMARKCX(pXPCX) ((CNewBookmarkWnd *)((pXPCX)->fe.cx))
|
|
#define WINCX(pXPCX) ((CWinCX *)((pXPCX)->fe.cx))
|
|
#define CXDC(pXPCX) ((CDCCX *)((pXPCX)->fe.cx))
|
|
#define PANECX(pXPCX) ((CPaneCX *)((pXPCX)->fe.cx))
|
|
|
|
|
|
#endif // __CAST_H
|