/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- * * The contents of this file are subject to the Netscape Public * License Version 1.1 (the "License"); you may not use this file * except in compliance with the License. You may obtain a copy of * the License at http://www.mozilla.org/NPL/ * * Software distributed under the License is distributed on an "AS * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or * implied. See the License for the specific language governing * rights and limitations under the License. * * The Original Code is mozilla.org code. * * The Initial Developer of the Original Code is Netscape * Communications Corporation. Portions created by Netscape are * Copyright (C) 1998 Netscape Communications Corporation. All * Rights Reserved. * * Contributor(s): */ #ifndef nscore_h___ #define nscore_h___ #ifdef _WIN32 #define NS_WIN32 1 #endif #if defined(__unix) #define NS_UNIX 1 #endif #if defined(XP_OS2) #define NS_OS2 1 #endif #include "prtypes.h" #ifdef __cplusplus #include "nsDebug.h" #endif /* The preferred symbol for null. */ #define nsnull 0 /* Define brackets for protecting C code from C++ */ #ifdef __cplusplus #define NS_BEGIN_EXTERN_C extern "C" { #define NS_END_EXTERN_C } #else #define NS_BEGIN_EXTERN_C #define NS_END_EXTERN_C #endif /*----------------------------------------------------------------------*/ /* Import/export defines */ #ifdef NS_WIN32 #define NS_IMPORT _declspec(dllimport) #define NS_IMPORT_(type) type _declspec(dllimport) __stdcall #define NS_EXPORT _declspec(dllexport) /* XXX NS_EXPORT_ defined in nsCOm.h (xpcom) differs in where the __declspec is placed. It needs to be done this way to make the 4.x compiler happy... */ #undef NS_EXPORT_ #define NS_EXPORT_(type) type _declspec(dllexport) __stdcall #elif defined(XP_MAC) #define NS_IMPORT #define NS_IMPORT_(type) type /* XXX NS_EXPORT_ defined in nsCom.h actually does an export. Here it's just sugar. */ #undef NS_EXPORT #undef NS_EXPORT_ #define NS_EXPORT __declspec(export) #define NS_EXPORT_(type) __declspec(export) type #else /* XXX do something useful? */ #define NS_IMPORT #define NS_IMPORT_(type) type #define NS_EXPORT #define NS_EXPORT_(type) type #endif #ifdef _IMPL_NS_BASE #define NS_BASE NS_EXPORT #else #define NS_BASE NS_IMPORT #endif #ifdef _IMPL_NS_NET #define NS_NET NS_EXPORT #else #define NS_NET NS_IMPORT #endif #ifdef _IMPL_NS_DOM #define NS_DOM NS_EXPORT #else #define NS_DOM NS_IMPORT #endif #ifdef _IMPL_NS_WIDGET #define NS_WIDGET NS_EXPORT #else #define NS_WIDGET NS_IMPORT #endif #ifdef _IMPL_NS_VIEW #define NS_VIEW NS_EXPORT #else #define NS_VIEW NS_IMPORT #endif #ifdef _IMPL_NS_GFXNONXP #define NS_GFXNONXP NS_EXPORT #define NS_GFXNONXP_(type) NS_EXPORT_(type) #else #define NS_GFXNONXP NS_IMPORT #define NS_GFXNONXP_(type) NS_IMPORT_(type) #endif #ifdef _IMPL_NS_GFX #define NS_GFX NS_EXPORT #define NS_GFX_(type) NS_EXPORT_(type) #else #define NS_GFX NS_IMPORT #define NS_GFX_(type) NS_IMPORT_(type) #endif #ifdef _IMPL_NS_PLUGIN #define NS_PLUGIN NS_EXPORT #else #define NS_PLUGIN NS_IMPORT #endif #ifdef _IMPL_NS_APPSHELL #define NS_APPSHELL NS_EXPORT #else #define NS_APPSHELL NS_IMPORT #endif /* ------------------------------------------------------------------------ */ /* Casting macros for hiding C++ features from older compilers */ /* All our compiler support template specialization, but not all support the |template <>| notation. The compiler that don't understand this notation just omit it for specialization. Need to add an autoconf test for this. */ /* under Metrowerks (Mac), we don't have autoconf yet */ #ifdef __MWERKS__ #define HAVE_CPP_SPECIALIZATION #define HAVE_CPP_PARTIAL_SPECIALIZATION #define HAVE_CPP_MODERN_SPECIALIZE_TEMPLATE_SYNTAX #define HAVE_CPP_ACCESS_CHANGING_USING #define HAVE_CPP_AMBIGUITY_RESOLVING_USING #define HAVE_CPP_EXPLICIT #define HAVE_CPP_TYPENAME #define HAVE_CPP_BOOL #define HAVE_CPP_NAMESPACE_STD #define HAVE_CPP_UNAMBIGUOUS_STD_NOTEQUAL #define HAVE_CPP_2BYTE_WCHAR_T #endif /* under VC++ (Windows), we don't have autoconf yet */ #if defined(_MSC_VER) && (_MSC_VER>=1100) /* VC++ 5.0 and greater implement template specialization, 4.2 is unknown */ #define HAVE_CPP_SPECIALIZATION #define HAVE_CPP_MODERN_SPECIALIZE_TEMPLATE_SYNTAX #define HAVE_CPP_EXPLICIT #define HAVE_CPP_TYPENAME #define HAVE_CPP_ACCESS_CHANGING_USING #if (_MSC_VER<1100) /* before 5.0, VC++ couldn't handle explicit */ #undef HAVE_CPP_EXPLICIT #elif (_MSC_VER==1100) /* VC++5.0 has an internal compiler error (sometimes) without this */ #undef HAVE_CPP_ACCESS_CHANGING_USING #endif #define HAVE_CPP_NAMESPACE_STD #define HAVE_CPP_UNAMBIGUOUS_STD_NOTEQUAL #define HAVE_CPP_2BYTE_WCHAR_T #endif /* until we get an autoconf test for this, we'll assume it's on (since we're using it already) */ #define HAVE_CPP_TYPENAME /* waiting to find out if OS/2 VisualAge participates in autoconf */ #if defined(XP_OS2_VACPP) || defined(AIX) || (defined(IRIX) && !defined(__GNUC__)) #undef HAVE_CPP_TYPENAME #endif #ifndef __PRUNICHAR__ #define __PRUNICHAR__ /* For now, don't use wchar_t on Unix because it breaks the Netscape * commercial build. When this is fixed there will be no need for the * |NS_REINTERPRET_CAST| in nsLiteralString.h either. */ #if defined(HAVE_CPP_2BYTE_WCHAR_T) && (defined(XP_WIN) || defined(XP_MAC)) typedef wchar_t PRUnichar; #else typedef PRUint16 PRUnichar; #endif #endif /* If the compiler doesn't support |explicit|, we'll just make it go away, trusting that the builds under compilers that do have it will keep us on the straight and narrow. */ #ifndef HAVE_CPP_EXPLICIT #define explicit #endif #ifndef HAVE_CPP_TYPENAME #define typename #endif #ifdef HAVE_CPP_MODERN_SPECIALIZE_TEMPLATE_SYNTAX #define NS_SPECIALIZE_TEMPLATE template <> #else #define NS_SPECIALIZE_TEMPLATE #endif /* unix and beos now determine this automatically */ #if ! defined XP_UNIX && ! defined XP_BEOS && !defined(XP_OS2) #define HAVE_CPP_NEW_CASTS /* we'll be optimistic. */ #endif #if defined(HAVE_CPP_NEW_CASTS) #define NS_STATIC_CAST(__type, __ptr) static_cast< __type >(__ptr) #define NS_CONST_CAST(__type, __ptr) const_cast< __type >(__ptr) #define NS_REINTERPRET_POINTER_CAST(__type, __ptr) reinterpret_cast< __type >(__ptr) #define NS_REINTERPRET_NONPOINTER_CAST(__type, __obj) reinterpret_cast< __type >(__obj) #define NS_REINTERPRET_CAST(__type, __expr) reinterpret_cast< __type >(__expr) #else #define NS_STATIC_CAST(__type, __ptr) ((__type)(__ptr)) #define NS_CONST_CAST(__type, __ptr) ((__type)(__ptr)) #define NS_REINTERPRET_POINTER_CAST(__type, __ptr) ((__type)((void*)(__ptr))) #define NS_REINTERPRET_NONPOINTER_CAST(__type, __obj) ((__type)(__obj)) /* Note: the following is only appropriate for pointers. */ #define NS_REINTERPRET_CAST(__type, __expr) NS_REINTERPRET_POINTER_CAST(__type, __expr) /* Why cast to a |void*| first? Well, when old-style casting from a pointer to a base to a pointer to a derived class, the cast will be ambiguous if the source pointer type appears multiple times in the destination, e.g., class Base {}; class Derived : public Base, public Base {}; void foo( Base* b ) { ((Derived*)b)->some_derived_member ... // Error: Ambiguous, expand from which |Base|? } an old-style cast (like |static_cast|) will change the pointer, but here, doesn't know how. The cast to |void*| prevents it from thinking it needs to expand the original pointer. The cost is, |NS_REINTERPRET_CAST| is no longer appropriate for non-pointer conversions. Also, mis-applying |NS_REINTERPRET_CAST| to cast |this| to something will still expand the pointer to the outer object in standards complying compilers. */ /* No sense in making an NS_DYNAMIC_CAST() macro: you can't duplicate the semantics. So if you want to dynamic_cast, then just use it "straight", no macro. */ #endif #endif /* nscore_h___ */