make wxSTRING_BASE_HASNT_CLEAR check more readable

[wxWidgets.git] / docs / doxygen / mainpages / const_cpp.h

/////////////////////////////////////////////////////////////////////////////
// Name:        const_cpp.h
// Purpose:     Preprocessor symbols
// Author:      Vadim Zeitlin
// RCS-ID:      $Id$
// Licence:     wxWindows license
/////////////////////////////////////////////////////////////////////////////


/**

@page page_cppconst Preprocessor symbols defined by wxWidgets

These are preprocessor symbols used in the wxWidgets source, grouped
by category (and sorted by alphabetical order inside each category).
All of these macros except for the @c wxUSE_XXX variety is defined if the
corresponding condition is @true and undefined if it isn't, so they should be
always tested using @ifdef_ and not @if_.

@li @ref page_cppconst_guisystem
@li @ref page_cppconst_os
@li @ref page_cppconst_cpu
@li @ref page_cppconst_hardware
@li @ref page_cppconst_compiler
@li @ref page_cppconst_featuretests
@li @ref page_cppconst_msvc_setup_h
@li @ref page_cppconst_miscellaneous

<hr>


@section page_cppconst_guisystem GUI system

@beginDefList
@itemdef{__WINDOWS__, any Windows, you may also use __WXMSW__}
@itemdef{__WIN16__, Win16 API (not supported since wxWidgets 2.6)}
@itemdef{__WIN32__, Win32 API}
@itemdef{__WXBASE__, Only wxBase, no GUI features (same as @c wxUSE_GUI == 0)}
@itemdef{__WXCOCOA__, OS X using wxCocoa Port}
@itemdef{__WXDFB__, wxUniversal using DirectFB}
@itemdef{__WXWINCE__, Windows CE}
@itemdef{__WXGTK__, GTK+}
@itemdef{__WXGTK12__, GTK+ 1.2 or higher}
@itemdef{__WXGTK20__, GTK+ 2.0 or higher}
@itemdef{__WXGTK24__, GTK+ 2.4 or higher}
@itemdef{__WXGTK26__, GTK+ 2.6 or higher}
@itemdef{__WXGTK210__, GTK+ 2.10 or higher}
@itemdef{__WXMAC__, old define for Mac OS X}
@itemdef{__WXMOTIF__, Motif}
@itemdef{__WXMOTIF20__, Motif 2.0 or higher}
@itemdef{__WXMGL__, SciTech Soft MGL (__WXUNIVERSAL__ will be also defined)}
@itemdef{__WXMSW__, Any Windows}
@itemdef{__WXOSX__, any OS X}
@itemdef{__WXOSX_IPHONE__, OS X iPhone}
@itemdef{__WXOSX_CARBON__, Mac OS X using Carbon}
@itemdef{__WXOSX_COCOA__, Mac OS X using Cocoa}
@itemdef{__WXOSX_MAC__, Mac OS X (Carbon or Cocoa)}
@itemdef{__WXOSX_OR_COCOA__, Any Mac OS X port (wxOSX-Carbon, wxOSX-Cocoa or 
                        wxCocoa)}
@itemdef{__WXPALMOS__, PalmOS}
@itemdef{__WXPM__, OS/2 native Presentation Manager}
@itemdef{__WXSTUBS__, Stubbed version ('template' wxWin implementation)}
@itemdef{__WXXT__, Xt; mutually exclusive with WX_MOTIF, not implemented in wxWidgets 2.x}
@itemdef{__WXX11__, wxX11 (__WXUNIVERSAL__ will be also defined)}
@itemdef{__WXWINE__, WINE (i.e. WIN32 on Unix)}
@itemdef{__WXUNIVERSAL__, wxUniversal port, always defined in addition
                        to one of the symbols above so this should be tested first.}
@itemdef{__X__, any X11-based GUI toolkit except GTK+}
@endDefList

There are two wxWidgets ports to Mac OS X. One of them, wxOSX is the successor of the
venerable wxMac, it currently exists in three versions: Carbon and Cocoa for the
desktop and a very early iPhone port. And there is the Cocoa port named wxCocoa 
which has not been updated very actively since beginning 2008. To summarize:

@li If you want to test for wxOSX on the desktop, use
    @c __WXOSX_MAC__.
@li If you want to test for wxOSX on the iPhone, use
    @c __WXOSX_IPHONE__.
@li If you want to test for any GUI Mac port under OS X, use
    @c __WXOSX_OR_COCOA__.
@li If you want to test for any port under Mac OS X, including, for
    example, wxGTK and also wxBase, use @c __DARWIN__ (see below).

The convention is to use the @c __WX prefix for these
symbols, although this has not always been followed.


@section page_cppconst_os Operating systems

@beginDefList
@itemdef{__APPLE__, any Mac OS version}
@itemdef{__AIX__, AIX}
@itemdef{__BSD__, Any *BSD system}
@itemdef{__CYGWIN__, Cygwin: Unix on Win32}
@itemdef{__DARWIN__, Mac OS X using the BSD Unix C library
                    (as opposed to using the Metrowerks MSL C/C++ library)}
@itemdef{__DATA_GENERAL__, DG-UX}
@itemdef{__DOS_GENERAL__, DOS (used with wxMGL only)}
@itemdef{__FREEBSD__, FreeBSD}
@itemdef{__HPUX__, HP-UX (Unix)}
@itemdef{__GNU__, GNU Hurd}
@itemdef{__LINUX__, Linux}
@itemdef{__MACH__, Mach-O Architecture (Mac OS X only builds)}
@itemdef{__OSF__, OSF/1}
@itemdef{__PALMOS__, PalmOS}
@itemdef{__SGI__, IRIX}
@itemdef{__SOLARIS__, Solaris}
@itemdef{__SUN__, Any Sun}
@itemdef{__SUNOS__, Sun OS}
@itemdef{__SVR4__, SystemV R4}
@itemdef{__SYSV__, SystemV generic}
@itemdef{__ULTRIX__, Ultrix}
@itemdef{__UNIX__, any Unix}
@itemdef{__UNIX_LIKE__, Unix, BeOS or VMS}
@itemdef{__VMS__, VMS}
@itemdef{__WINDOWS__, any Windows}
@itemdef{__WINE__, Wine}
@itemdef{_WIN32_WCE, Windows CE version}
@endDefList



@section page_cppconst_cpu Hardware architectures (CPU)

Note that not all of these symbols are always defined, it depends on the
compiler used.

@beginDefList
@itemdef{__ALPHA__, DEC Alpha architecture}
@itemdef{__INTEL__, Intel i386 or compatible}
@itemdef{__IA64__, Intel 64 bit architecture}
@itemdef{__POWERPC__, Motorola Power PC}
@endDefList



@section page_cppconst_hardware Hardware type

@beginDefList
@itemdef{__SMARTPHONE__, Generic mobile devices with phone buttons and a small display}
@itemdef{__PDA__, Personal digital assistant, usually with touch screen}
@itemdef{__HANDHELD__, Small but powerful computer, usually with a keyboard}
@itemdef{__POCKETPC__, Microsoft-powered PocketPC devices with touch-screen}
@itemdef{__WINCE_STANDARDSDK__, Microsoft-powered Windows CE devices, for generic Windows CE applications}
@itemdef{__WINCE_NET__, Microsoft-powered Windows CE .NET devices (_WIN32_WCE is 400 or greater)}
@itemdef{WIN32_PLATFORM_WFSP, Microsoft-powered smartphone}
@endDefList



@section page_cppconst_compiler Compilers

@beginDefList
@itemdef{__BORLANDC__, Borland C++. The value of the macro corresponds
                        to the compiler version: 500 is 5.0.}
@itemdef{__DJGPP__, DJGPP}
@itemdef{__DIGITALMARS__, Digital Mars}
@itemdef{__EVC4__, Embedded Visual C++ 4 (can be only used for building wxWinCE)}
@itemdef{__GNUG__, Gnu C++ on any platform, see also wxCHECK_GCC_VERSION}
@itemdef{__GNUWIN32__, Gnu-Win32 compiler, see also wxCHECK_W32API_VERSION}
@itemdef{__MINGW32__, MinGW}
@itemdef{__MWERKS__, CodeWarrior MetroWerks compiler}
@itemdef{__SUNCC__, Sun CC, see also wxCHECK_SUNCC_VERSION}
@itemdef{__SYMANTECC__, Symantec C++}
@itemdef{__VISAGECPP__, IBM Visual Age (OS/2)}
@itemdef{__VISUALC__, Microsoft Visual C++, see also wxCHECK_VISUALC_VERSION.
                    The value of this macro corresponds to the compiler version:
                    @c 1020 for @c 4.2 (the first supported version), @c 1100 for
                    @c 5.0, @c 1200 for @c 6.0 and so on. For convenience, the symbols
                    __VISUALCn__ are also defined for each major compiler version from
                    5 to 9, i.e. you can use tests such @ifdef_ __VISUALC7__ to test
                    for compiler version being precisely 7.}
@itemdef{__XLC__, AIX compiler}
@itemdef{__WATCOMC__, Watcom C++. The value of this macro corresponds to
                    the compiler version, @c 1100 is @c 11.0 and @c 1200 is OpenWatcom.}
@endDefList



@section page_cppconst_featuretests Feature tests

Some library features may not be always available even if they were selected
by the user. To make it possible to check if this is the case, the library
predefines the symbols in the form @c wxHAS_FEATURE. Unlike
@c wxUSE_FEATURE symbols which are defined by the library user (directly
in @c setup.h or by running configure script) and which must be always
defined as either 0 or 1, the @c wxHAS symbols are only defined if
the corresponding feature is available and not defined at all otherwise.

Currently the following symbols exist:

@beginDefList
@itemdef{wxHAS_ATOMIC_OPS, Defined if wxAtomicInc() and wxAtomicDec() functions
    have an efficient (CPU-specific) implementation. Notice that the functions
    themselves are always available but can be prohibitively slow to use when
    implemented in a generic way, using a critical section.}
@itemdef{wxHAS_CONFIG_TEMPLATE_RW, Defined if the currently used compiler
    supports template Read() and Write() methods in wxConfig.}
@itemdef{wxHAS_LARGE_FILES, Defined if wxFile supports files more than 4GB in size.}
@itemdef{wxHAS_LARGE_FFILES, Defined if wxFFile supports files more than 4GB in size.}
@itemdef{wxHAS_MULTIPLE_FILEDLG_FILTERS, Defined if wxFileDialog supports multiple ('|'-separated) filters.}
@itemdef{wxHAS_POWER_EVENTS, Defined if wxPowerEvent are ever generated on the current platform.}
@itemdef{wxHAS_RADIO_MENU_ITEMS,
        Defined if the current port supports radio menu items (see wxMenu::AppendRadioItem).}
@itemdef{wxHAS_RAW_BITMAP, Defined if direct access to bitmap data using the classes in @c wx/rawbmp.h is supported.}
@itemdef{wxHAS_RAW_KEY_CODES, Defined if raw key codes (see wxKeyEvent::GetRawKeyCode are supported.}
@itemdef{wxHAS_REGEX_ADVANCED, Defined if advanced syntax is available in wxRegEx.}
@itemdef{wxHAS_TASK_BAR_ICON, Defined if wxTaskBarIcon is available on the current platform.}
@endDefList



@section page_cppconst_msvc_setup_h Libraries selection for MSVC setup.h

Microsoft Visual C++ users may use the special @c wx/setup.h file for this
compiler in @c include/msvc subdirectory. This file implicitly links in all the
wxWidgets libraries using MSVC-specific pragmas which usually is much more
convenient than manually specifying the libraries list in all of the project
configurations. However sometimes linking with all the libraries is not
desirable, for example because some of them were not built and this is where
the symbols in this section can be helpful: defining them allows to not link
with the corresponding library. The following symbols are honoured:
    - wxNO_ADV_LIB
    - wxNO_AUI_LIB
    - wxNO_HTML_LIB
    - wxNO_MEDIA_LIB
    - wxNO_NET_LIB
    - wxNO_PROPGRID_LIB
    - wxNO_QA_LIB
    - wxNO_RICHTEXT_LIB
    - wxNO_XML_LIB
    - wxNO_REGEX_LIB
    - wxNO_EXPAT_LIB
    - wxNO_JPEG_LIB
    - wxNO_PNG_LIB
    - wxNO_TIFF_LIB
    - wxNO_ZLIB_LIB

Notice that the base library is always included and the core is always included
for the GUI applications (i.e. those which don't define @c wxUSE_GUI as 0).


@section page_cppconst_miscellaneous Miscellaneous

@beginDefList
@itemdef{__WXWINDOWS__,
        always defined in wxWidgets applications, see also wxCHECK_VERSION}
@itemdef{__WXDEBUG__, defined in debug mode, undefined in release mode}
@itemdef{wxUSE_XXX,
        if defined as 1, feature XXX is active, see the
        @ref page_wxusedef (the symbols of this form are always defined,
        use @if_ and not @ifdef_ to test for them)}
@itemdef{WX_PRECOMP,
        is defined if precompiled headers (PCH) are in use. In
        this case, @c wx/wxprec.h includes @c wx/wx.h which, in turn,
        includes a number of wxWidgets headers thus making it unnecessary to include
        them explicitly. However if this is not defined, you do need to include them
        and so the usual idiom which allows to support both cases is to first include
        @c wx/wxprec.h} and then, inside @ifndef_ WX_PRECOMP, individual
        headers you need.}
@itemdef{_UNICODE and UNICODE, both are defined if wxUSE_UNICODE is set to @c 1}
@itemdef{wxUSE_GUI,
        this particular feature test macro is defined to 1
        when compiling or using the library with the GUI features activated,
        if it is defined as @c 0, only wxBase is available.}
@itemdef{wxUSE_BASE,
        only used by wxWidgets internally (defined as 1 when
        building wxBase code, either as a standalone library or as part of the
        monolithic wxWidgets library, defined as 0 when building GUI library only)}
@itemdef{wxNO_RTTI, is defined if the compiler RTTI support has been switched off}
@itemdef{wxNO_EXCEPTIONS,
        is defined if the compiler support for C++ exceptions has been switched off}
@itemdef{wxNO_THREADS,
        if this macro is defined, the compilation options
        don't include compiler flags needed for multithreaded code generation. This
        implies that wxUSE_THREADS is 0 and also that other (non-wx-based) threading
        packages cannot be used neither.}
@itemdef{WXMAKINGDLL_XXX,
        used internally and defined when building the
        library @c XXX as a DLL; when a monolithic wxWidgets build is used only a
        single @c WXMAKINGDLL symbol is defined}
@itemdef{WXUSINGDLL,
        defined when compiling code which uses wxWidgets as a DLL/shared library}
@itemdef{WXBUILDING,
        defined when building wxWidgets itself, whether as a static or shared library}
@endDefList

*/