mirror of
https://github.com/mozilla/gecko-dev.git
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232 lines
6.3 KiB
C++
232 lines
6.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#ifndef nscore_h___
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#define nscore_h___
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#ifdef _WIN32
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#define NS_WIN32 1
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#endif
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#if defined(__unix)
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#define NS_UNIX 1
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#endif
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#if defined(XP_OS2)
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#define NS_OS2 1
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#endif
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#include "prtypes.h"
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#ifdef __cplusplus
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#include "nsDebug.h"
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#endif
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#ifndef __PRUNICHAR__
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#define __PRUNICHAR__
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typedef PRUint16 PRUnichar;
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#endif
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/* The preferred symbol for null. */
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#define nsnull 0
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/* Define brackets for protecting C code from C++ */
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#ifdef __cplusplus
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#define NS_BEGIN_EXTERN_C extern "C" {
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#define NS_END_EXTERN_C }
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#else
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#define NS_BEGIN_EXTERN_C
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#define NS_END_EXTERN_C
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#endif
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/*----------------------------------------------------------------------*/
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/* Import/export defines */
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#ifdef NS_WIN32
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#define NS_IMPORT _declspec(dllimport)
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#define NS_IMPORT_(type) type _declspec(dllimport) __stdcall
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#define NS_EXPORT _declspec(dllexport)
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/* XXX NS_EXPORT_ defined in nsCOm.h (xpcom) differs in where the __declspec
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is placed. It needs to be done this way to make the 4.x compiler happy... */
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#undef NS_EXPORT_
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#define NS_EXPORT_(type) type _declspec(dllexport) __stdcall
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#elif defined(XP_MAC)
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#define NS_IMPORT
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#define NS_IMPORT_(type) type
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/* XXX NS_EXPORT_ defined in nsCom.h actually does an export. Here it's just sugar. */
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#undef NS_EXPORT
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#undef NS_EXPORT_
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#define NS_EXPORT __declspec(export)
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#define NS_EXPORT_(type) __declspec(export) type
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#else
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/* XXX do something useful? */
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#define NS_IMPORT
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#define NS_IMPORT_(type) type
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#define NS_EXPORT
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#define NS_EXPORT_(type) type
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#endif
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#ifdef _IMPL_NS_BASE
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#define NS_BASE NS_EXPORT
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#else
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#define NS_BASE NS_IMPORT
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#endif
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#ifdef _IMPL_NS_NET
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#define NS_NET NS_EXPORT
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#else
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#define NS_NET NS_IMPORT
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#endif
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#ifdef _IMPL_NS_DOM
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#define NS_DOM NS_EXPORT
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#else
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#define NS_DOM NS_IMPORT
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#endif
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#ifdef _IMPL_NS_WIDGET
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#define NS_WIDGET NS_EXPORT
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#else
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#define NS_WIDGET NS_IMPORT
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#endif
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#ifdef _IMPL_NS_VIEW
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#define NS_VIEW NS_EXPORT
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#else
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#define NS_VIEW NS_IMPORT
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#endif
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#ifdef _IMPL_NS_GFXNONXP
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#define NS_GFXNONXP NS_EXPORT
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#define NS_GFXNONXP_(type) NS_EXPORT_(type)
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#else
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#define NS_GFXNONXP NS_IMPORT
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#define NS_GFXNONXP_(type) NS_IMPORT_(type)
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#endif
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#ifdef _IMPL_NS_GFX
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#define NS_GFX NS_EXPORT
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#define NS_GFX_(type) NS_EXPORT_(type)
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#else
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#define NS_GFX NS_IMPORT
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#define NS_GFX_(type) NS_IMPORT_(type)
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#endif
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#ifdef _IMPL_NS_PLUGIN
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#define NS_PLUGIN NS_EXPORT
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#else
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#define NS_PLUGIN NS_IMPORT
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#endif
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#ifdef _IMPL_NS_APPSHELL
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#define NS_APPSHELL NS_EXPORT
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#else
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#define NS_APPSHELL NS_IMPORT
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#endif
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/* ------------------------------------------------------------------------ */
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/* Casting macros for hiding C++ features from older compilers */
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/*
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All our compiler support template specialization, but not all support the
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|template <>| notation. The compiler that don't understand this notation
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just omit it for specialization.
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Need to add an autoconf test for this.
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*/
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/* under Metrowerks (Mac), we don't have autoconf yet */
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#ifdef __MWERKS__
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#define HAVE_CPP_SPECIALIZATION
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#define HAVE_CPP_MODERN_SPECIALIZE_TEMPLATE_SYNTAX
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#endif
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/* under VC++ (Windows), we don't have autoconf yet */
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#if defined(_MSC_VER) && (_MSC_VER>=1100)
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/* VC++ 5.0 and greater implement template specialization, 4.2 is unknown */
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#define HAVE_CPP_SPECIALIZATION
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#define HAVE_CPP_MODERN_SPECIALIZE_TEMPLATE_SYNTAX
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#endif
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#ifdef HAVE_CPP_MODERN_SPECIALIZE_TEMPLATE_SYNTAX
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#define NS_SPECIALIZE_TEMPLATE template <>
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#else
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#define NS_SPECIALIZE_TEMPLATE
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#endif
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/* unix and beos now determine this automatically */
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#if ! defined XP_UNIX && ! defined XP_BEOS && !defined(XP_OS2)
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#define HAVE_CPP_NEW_CASTS /* we'll be optimistic. */
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#endif
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#if defined(HAVE_CPP_NEW_CASTS)
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#define NS_STATIC_CAST(__type, __ptr) static_cast<__type>(__ptr)
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#define NS_CONST_CAST(__type, __ptr) const_cast<__type>(__ptr)
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#define NS_REINTERPRET_POINTER_CAST(__type, __ptr) reinterpret_cast<__type>(__ptr)
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#define NS_REINTERPRET_NONPOINTER_CAST(__type, __obj) reinterpret_cast<__type>(__obj)
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#define NS_REINTERPRET_CAST(__type, __expr) reinterpret_cast<__type>(__expr)
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#else
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#define NS_STATIC_CAST(__type, __ptr) ((__type)(__ptr))
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#define NS_CONST_CAST(__type, __ptr) ((__type)(__ptr))
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#define NS_REINTERPRET_POINTER_CAST(__type, __ptr) ((__type)((void*)(__ptr)))
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#define NS_REINTERPRET_NONPOINTER_CAST(__type, __obj) ((__type)(__obj))
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/* Note: the following is only appropriate for pointers. */
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#define NS_REINTERPRET_CAST(__type, __expr) NS_REINTERPRET_POINTER_CAST(__type, __expr)
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/*
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Why cast to a |void*| first? Well, when old-style casting from
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a pointer to a base to a pointer to a derived class, the cast will be
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ambiguous if the source pointer type appears multiple times in the
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destination, e.g.,
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class Base {};
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class Derived : public Base, public Base {};
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void foo( Base* b )
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{
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((Derived*)b)->some_deried_member ... // Error: Ambiguous, expand from which |Base|?
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}
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an old-style cast (like |static_cast|) will change the pointer, but
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here, doesn't know how. The cast to |void*| prevents it from thinking
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it needs to expand the original pointer.
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The cost is, |NS_REINTERPRET_CAST| is no longer appropriate for non-pointer
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conversions. Also, mis-applying |NS_REINTERPRET_CAST| to cast |this| to something
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will still expand the pointer to the outer object in standards complying compilers.
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*/
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#endif
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/* No sense in making an NS_DYNAMIC_CAST() macro: you can't duplicate
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the semantics. So if you want to dynamic_cast, then just use it
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"straight", no macro. */
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#endif /* nscore_h___ */
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