e08d449f2e
VC++ has a bug where __VA_ARGS__ is incorrectly expanded as a single token, contrary to C99. The solution is to pass the arguments to another macro as a single token inside parenthesis. See http://stackoverflow.com/questions/9183993/msvc-variadic-macro-expansion for the gory details. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72850 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
157 lines
5.9 KiB
C
157 lines
5.9 KiB
C
/*
|
|
* Name: wx/cpp.h
|
|
* Purpose: Various preprocessor helpers
|
|
* Author: Vadim Zeitlin
|
|
* Created: 2006-09-30
|
|
* RCS-ID: $Id$
|
|
* Copyright: (c) 2006 Vadim Zeitlin <vadim@wxwindows.org>
|
|
* Licence: wxWindows licence
|
|
*/
|
|
|
|
/* THIS IS A C FILE, DON'T USE C++ FEATURES (IN PARTICULAR COMMENTS) IN IT */
|
|
|
|
#ifndef _WX_CPP_H_
|
|
#define _WX_CPP_H_
|
|
|
|
/* wxCONCAT works like preprocessor ## operator but also works with macros */
|
|
#define wxCONCAT_HELPER(text, line) text ## line
|
|
|
|
#define wxCONCAT(x1, x2) \
|
|
wxCONCAT_HELPER(x1, x2)
|
|
#define wxCONCAT3(x1, x2, x3) \
|
|
wxCONCAT(wxCONCAT(x1, x2), x3)
|
|
#define wxCONCAT4(x1, x2, x3, x4) \
|
|
wxCONCAT(wxCONCAT3(x1, x2, x3), x4)
|
|
#define wxCONCAT5(x1, x2, x3, x4, x5) \
|
|
wxCONCAT(wxCONCAT4(x1, x2, x3, x4), x5)
|
|
#define wxCONCAT6(x1, x2, x3, x4, x5, x6) \
|
|
wxCONCAT(wxCONCAT5(x1, x2, x3, x4, x5), x6)
|
|
#define wxCONCAT7(x1, x2, x3, x4, x5, x6, x7) \
|
|
wxCONCAT(wxCONCAT6(x1, x2, x3, x4, x5, x6), x7)
|
|
#define wxCONCAT8(x1, x2, x3, x4, x5, x6, x7, x8) \
|
|
wxCONCAT(wxCONCAT7(x1, x2, x3, x4, x5, x6, x7), x8)
|
|
#define wxCONCAT9(x1, x2, x3, x4, x5, x6, x7, x8, x9) \
|
|
wxCONCAT(wxCONCAT8(x1, x2, x3, x4, x5, x6, x7, x8), x9)
|
|
|
|
/* wxSTRINGIZE works as the preprocessor # operator but also works with macros */
|
|
#define wxSTRINGIZE_HELPER(x) #x
|
|
#define wxSTRINGIZE(x) wxSTRINGIZE_HELPER(x)
|
|
|
|
/* a Unicode-friendly version of wxSTRINGIZE_T */
|
|
#define wxSTRINGIZE_T(x) wxAPPLY_T(wxSTRINGIZE(x))
|
|
|
|
/*
|
|
Special workarounds for compilers with broken "##" operator. For all the
|
|
other ones we can just use it directly.
|
|
*/
|
|
#ifdef wxCOMPILER_BROKEN_CONCAT_OPER
|
|
#define wxPREPEND_L(x) L ## x
|
|
#define wxAPPEND_i64(x) x ## i64
|
|
#define wxAPPEND_ui64(x) x ## ui64
|
|
#endif /* wxCOMPILER_BROKEN_CONCAT_OPER */
|
|
|
|
/*
|
|
Helper macros for wxMAKE_UNIQUE_NAME: normally this works by appending the
|
|
current line number to the given identifier to reduce the probability of the
|
|
conflict (it may still happen if this is used in the headers, hence you
|
|
should avoid doing it or provide unique prefixes then) but we have to do it
|
|
differently for VC++
|
|
*/
|
|
#if defined(__VISUALC__) && (__VISUALC__ >= 1300)
|
|
/*
|
|
__LINE__ handling is completely broken in VC++ when using "Edit and
|
|
Continue" (/ZI option) and results in preprocessor errors if we use it
|
|
inside the macros. Luckily VC7 has another standard macro which can be
|
|
used like this and is even better than __LINE__ because it is globally
|
|
unique.
|
|
*/
|
|
# define wxCONCAT_LINE(text) wxCONCAT(text, __COUNTER__)
|
|
#else /* normal compilers */
|
|
# define wxCONCAT_LINE(text) wxCONCAT(text, __LINE__)
|
|
#endif
|
|
|
|
/* Create a "unique" name with the given prefix */
|
|
#define wxMAKE_UNIQUE_NAME(text) wxCONCAT_LINE(text)
|
|
|
|
/*
|
|
This macro can be passed as argument to another macro when you don't have
|
|
anything to pass in fact.
|
|
*/
|
|
#define wxEMPTY_PARAMETER_VALUE /* Fake macro parameter value */
|
|
|
|
/*
|
|
Define __WXFUNCTION__ which is like standard __FUNCTION__ but defined as
|
|
NULL for the compilers which don't support the latter.
|
|
*/
|
|
#ifndef __WXFUNCTION__
|
|
/* TODO: add more compilers supporting __FUNCTION__ */
|
|
#if defined(__DMC__)
|
|
/*
|
|
__FUNCTION__ happens to be not defined within class members
|
|
http://www.digitalmars.com/drn-bin/wwwnews?c%2B%2B.beta/485
|
|
*/
|
|
#define __WXFUNCTION__ (NULL)
|
|
#elif defined(__GNUC__) || \
|
|
(defined(_MSC_VER) && _MSC_VER >= 1300) || \
|
|
defined(__FUNCTION__)
|
|
#define __WXFUNCTION__ __FUNCTION__
|
|
#else
|
|
/* still define __WXFUNCTION__ to avoid #ifdefs elsewhere */
|
|
#define __WXFUNCTION__ (NULL)
|
|
#endif
|
|
#endif /* __WXFUNCTION__ already defined */
|
|
|
|
|
|
#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || \
|
|
(defined(__cplusplus) && __cplusplus >= 201103L)
|
|
#define wxHAS_VARIADIC_MACROS
|
|
#elif defined(__GNUC__) && __GNUC__ >= 3
|
|
#define wxHAS_VARIADIC_MACROS
|
|
#elif defined(_MSC_VER) && _MSC_VER >= 1400
|
|
#define wxHAS_VARIADIC_MACROS
|
|
#endif
|
|
|
|
#ifdef wxHAS_VARIADIC_MACROS
|
|
/*
|
|
wxCALL_FOR_EACH(what, ...) calls the macro from its first argument, what(pos, x),
|
|
for every remaining argument 'x', with 'pos' being its 1-based index in
|
|
*reverse* order (with the last argument being numbered 1).
|
|
|
|
For example, wxCALL_FOR_EACH(test, a, b, c) expands into this:
|
|
|
|
test(3, a) \
|
|
test(2, b) \
|
|
test(1, c)
|
|
|
|
Up to eight arguments are supported.
|
|
|
|
(With thanks to https://groups.google.com/d/topic/comp.std.c/d-6Mj5Lko_s/discussion
|
|
and http://stackoverflow.com/questions/1872220/is-it-possible-to-iterate-over-arguments-in-variadic-macros)
|
|
*/
|
|
#define wxCALL_FOR_EACH_NARG(...) wxCALL_FOR_EACH_NARG_((__VA_ARGS__, wxCALL_FOR_EACH_RSEQ_N()))
|
|
#define wxCALL_FOR_EACH_NARG_(args) wxCALL_FOR_EACH_ARG_N args
|
|
#define wxCALL_FOR_EACH_ARG_N(_1, _2, _3, _4, _5, _6, _7, _8, N, ...) N
|
|
#define wxCALL_FOR_EACH_RSEQ_N() 8, 7, 6, 5, 4, 3, 2, 1, 0
|
|
|
|
#define wxCALL_FOR_EACH_1(what, x) what(1, x)
|
|
#define wxCALL_FOR_EACH_2(what, x, ...) what(2, x) wxCALL_FOR_EACH_1(what, __VA_ARGS__)
|
|
#define wxCALL_FOR_EACH_3(what, x, ...) what(3, x) wxCALL_FOR_EACH_2(what, __VA_ARGS__)
|
|
#define wxCALL_FOR_EACH_4(what, x, ...) what(4, x) wxCALL_FOR_EACH_3(what, __VA_ARGS__)
|
|
#define wxCALL_FOR_EACH_5(what, x, ...) what(5, x) wxCALL_FOR_EACH_4(what, __VA_ARGS__)
|
|
#define wxCALL_FOR_EACH_6(what, x, ...) what(6, x) wxCALL_FOR_EACH_5(what, __VA_ARGS__)
|
|
#define wxCALL_FOR_EACH_7(what, x, ...) what(7, x) wxCALL_FOR_EACH_6(what, __VA_ARGS__)
|
|
#define wxCALL_FOR_EACH_8(what, x, ...) what(8, x) wxCALL_FOR_EACH_7(what, __VA_ARGS__)
|
|
|
|
#define wxCALL_FOR_EACH_(N, args) \
|
|
wxCONCAT(wxCALL_FOR_EACH_, N) args
|
|
|
|
#define wxCALL_FOR_EACH(what, ...) \
|
|
wxCALL_FOR_EACH_(wxCALL_FOR_EACH_NARG(__VA_ARGS__), (what, __VA_ARGS__))
|
|
|
|
#else
|
|
#define wxCALL_FOR_EACH Error_wx_CALL_FOR_EACH_requires_variadic_macros_support
|
|
#endif /* wxHAS_VARIADIC_MACROS */
|
|
|
|
#endif /* _WX_CPP_H_ */
|
|
|