wxWidgets/interface/defs.h

/////////////////////////////////////////////////////////////////////////////
// Name:        defs.h
// Purpose:     documentation for global functions
// Author:      wxWidgets team
// RCS-ID:      $Id$
// Licence:     wxWindows license
/////////////////////////////////////////////////////////////////////////////

//@{
/**
    These macros will swap the bytes of the @a value variable from little
    endian to big endian or vice versa unconditionally, i.e. independently of the
    current platform.
*/
wxInt32 wxINT32_SWAP_ALWAYS(wxInt32 value);
wxUint32 wxUINT32_SWAP_ALWAYS(wxUint32 value);
wxInt16 wxINT16_SWAP_ALWAYS(wxInt16 value);
wxUint16 wxUINT16_SWAP_ALWAYS(wxUint16 value);
//@}


//@{
/**
    This macro will swap the bytes of the @a value variable from little
    endian to big endian or vice versa if the program is compiled on a
    little-endian architecture (such as Intel PCs). If the program has
    been compiled on a big-endian architecture, the value will be unchanged.
    Use these macros to read data from and write data to a file that stores
    data in big-endian format.
*/
wxInt32 wxINT32_SWAP_ON_LE(wxInt32 value);
wxUint32 wxUINT32_SWAP_ON_LE(wxUint32 value);
wxInt16 wxINT16_SWAP_ON_LE(wxInt16 value);
wxUint16 wxUINT16_SWAP_ON_LE(wxUint16 value);
//@}

/**
    This macro is similar to wxDEPRECATED but can be used
    to not only declare the function @a func as deprecated but to also provide
    its (inline) implementation @e body.
    It can be used as following:

    @code
    class wxFoo
        {
        public:
            // OldMethod() is deprecated, use NewMethod() instead
            void NewMethod();
            wxDEPRECATED_INLINE( void OldMethod(), NewMethod() );
        };
    @endcode
*/
#define wxDEPRECATED_INLINE(func, body)     /* implementation is private */

/**
    @c wxEXPLICIT is a macro which expands to the C++ @c explicit keyword if
    the compiler supports it or nothing otherwise. Thus, it can be used even in the
    code which might have to be compiled with an old compiler without support for
    this language feature but still take advantage of it when it is available.
*/


/**
    GNU C++ compiler gives a warning for any class whose destructor is private
    unless it has a friend. This warning may sometimes be useful but it doesn't
    make sense for reference counted class which always delete themselves (hence
    destructor should be private) but don't necessarily have any friends, so this
    macro is provided to disable the warning in such case. The @a name parameter
    should be the name of the class but is only used to construct a unique friend
    class name internally. Example of using the macro:

    @code
    class RefCounted
        {
        public:
            RefCounted() { m_nRef = 1; }
            void IncRef() { m_nRef++ ; }
            void DecRef() { if ( !--m_nRef ) delete this; }

        private:
            ~RefCounted() { }

            wxSUPPRESS_GCC_PRIVATE_DTOR(RefCounted)
        };
    @endcode

    Notice that there should be no semicolon after this macro.
*/
#define wxSUPPRESS_GCC_PRIVATE_DTOR_WARNING(name)     /* implementation is private */

//@{
/**
    This macro will swap the bytes of the @a value variable from little
    endian to big endian or vice versa if the program is compiled on a
    big-endian architecture (such as Sun work stations). If the program has
    been compiled on a little-endian architecture, the value will be unchanged.
    Use these macros to read data from and write data to a file that stores
    data in little-endian (for example Intel i386) format.
*/
wxInt32 wxINT32_SWAP_ON_BE(wxInt32 value);
wxUint32 wxUINT32_SWAP_ON_BE(wxUint32 value);
wxInt16 wxINT16_SWAP_ON_BE(wxInt16 value);
wxUint16 wxUINT16_SWAP_ON_BE(wxUint16 value);
//@}

/**
    This macro can be used around a function declaration to generate warnings
    indicating that this function is deprecated (i.e. obsolete and planned to be
    removed in the future) when it is used. Only Visual C++ 7 and higher and g++
    compilers currently support this functionality.
    Example of use:

    @code
    // old function, use wxString version instead
        wxDEPRECATED( void wxGetSomething(char *buf, size_t len) );

        // ...
        wxString wxGetSomething();
    @endcode
*/


/**
    This macro is the same as the standard C99 @c va_copy for the compilers
    which support it or its replacement for those that don't. It must be used to
    preserve the value of a @c va_list object if you need to use it after
    passing it to another function because it can be modified by the latter.
    As with @c va_start, each call to @c wxVaCopy must have a matching
    @c va_end.
*/
void wxVaCopy(va_list argptrDst, va_list argptrSrc);

/**
    This is a special version of wxDEPRECATED macro which
    only does something when the deprecated function is used from the code outside
    wxWidgets itself but doesn't generate warnings when it is used from wxWidgets.
    It is used with the virtual functions which are called by the library itself --
    even if such function is deprecated the library still has to call it to ensure
    that the existing code overriding it continues to work, but the use of this
    macro ensures that a deprecation warning will be generated if this function is
    used from the user code or, in case of Visual C++, even when it is simply
    overridden.
*/