a7df23d43c
wxWidgets now supports only GCC 4 and newer, so there is no reason to keep code specific for older GCC versions.
194 lines
7.4 KiB
C++
194 lines
7.4 KiB
C++
/*
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* Name: wx/cpp.h
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* Purpose: Various preprocessor helpers
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* Author: Vadim Zeitlin
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* Created: 2006-09-30
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* Copyright: (c) 2006 Vadim Zeitlin <vadim@wxwidgets.org>
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* Licence: wxWindows licence
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*/
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/* THIS IS A C FILE, DON'T USE C++ FEATURES (IN PARTICULAR COMMENTS) IN IT */
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#ifndef _WX_CPP_H_
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#define _WX_CPP_H_
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#include "wx/compiler.h" /* wxCHECK_XXX_VERSION() macros */
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/* wxCONCAT works like preprocessor ## operator but also works with macros */
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#define wxCONCAT_HELPER(text, line) text ## line
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#define wxCONCAT(x1, x2) \
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wxCONCAT_HELPER(x1, x2)
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#define wxCONCAT3(x1, x2, x3) \
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wxCONCAT(wxCONCAT(x1, x2), x3)
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#define wxCONCAT4(x1, x2, x3, x4) \
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wxCONCAT(wxCONCAT3(x1, x2, x3), x4)
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#define wxCONCAT5(x1, x2, x3, x4, x5) \
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wxCONCAT(wxCONCAT4(x1, x2, x3, x4), x5)
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#define wxCONCAT6(x1, x2, x3, x4, x5, x6) \
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wxCONCAT(wxCONCAT5(x1, x2, x3, x4, x5), x6)
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#define wxCONCAT7(x1, x2, x3, x4, x5, x6, x7) \
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wxCONCAT(wxCONCAT6(x1, x2, x3, x4, x5, x6), x7)
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#define wxCONCAT8(x1, x2, x3, x4, x5, x6, x7, x8) \
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wxCONCAT(wxCONCAT7(x1, x2, x3, x4, x5, x6, x7), x8)
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#define wxCONCAT9(x1, x2, x3, x4, x5, x6, x7, x8, x9) \
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wxCONCAT(wxCONCAT8(x1, x2, x3, x4, x5, x6, x7, x8), x9)
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/* wxSTRINGIZE works as the preprocessor # operator but also works with macros */
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#define wxSTRINGIZE_HELPER(x) #x
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#define wxSTRINGIZE(x) wxSTRINGIZE_HELPER(x)
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/* a Unicode-friendly version of wxSTRINGIZE_T */
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#define wxSTRINGIZE_T(x) wxAPPLY_T(wxSTRINGIZE(x))
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/*
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Helper macros for wxMAKE_UNIQUE_NAME: normally this works by appending the
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current line number to the given identifier to reduce the probability of the
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conflict (it may still happen if this is used in the headers, hence you
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should avoid doing it or provide unique prefixes then) but we have to do it
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differently for VC++
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*/
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#if defined(__VISUALC__)
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/*
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__LINE__ handling is completely broken in VC++ when using "Edit and
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Continue" (/ZI option) and results in preprocessor errors if we use it
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inside the macros. Luckily VC7 has another standard macro which can be
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used like this and is even better than __LINE__ because it is globally
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unique.
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*/
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# define wxCONCAT_LINE(text) wxCONCAT(text, __COUNTER__)
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#else /* normal compilers */
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# define wxCONCAT_LINE(text) wxCONCAT(text, __LINE__)
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#endif
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/* Create a "unique" name with the given prefix */
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#define wxMAKE_UNIQUE_NAME(text) wxCONCAT_LINE(text)
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/*
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This macro can be passed as argument to another macro when you don't have
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anything to pass in fact.
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*/
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#define wxEMPTY_PARAMETER_VALUE /* Fake macro parameter value */
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/*
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Helpers for defining macros that expand into a single statement.
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The standard solution is to use "do { ... } while (0)" statement but MSVC
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generates a C4127 "condition expression is constant" warning for it so we
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use something which is just complicated enough to not be recognized as a
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constant but still simple enough to be optimized away.
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Another solution would be to use __pragma() to temporarily disable C4127.
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Notice that wxASSERT_ARG_TYPE in wx/strvargarg.h relies on these macros
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creating some kind of a loop because it uses "break".
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*/
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#define wxSTATEMENT_MACRO_BEGIN do {
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#define wxSTATEMENT_MACRO_END } while ( (void)0, 0 )
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/*
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Helper for executing the following statement conditionally without using
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conditional statements.
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This strange macro is needed in the first place to avoid the problems due
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to nested if/else inside macros. E.g. if some MACRO started with "if", then
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if ( cond )
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MACRO();
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else
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...
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would be broken because "..." would bind to the wrong "if" inside the macro
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rather than the visible one. So we use wxDO_IF() inside the macro instead
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to avoid this problem.
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*/
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#define wxDO_IF_HELPER(loopvar, condition) \
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for ( bool loopvar = false; !loopvar && condition; loopvar = true )
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#define wxDO_IF(condition) wxDO_IF_HELPER(wxMAKE_UNIQUE_NAME(wxdoif), condition)
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/*
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Define __WXFUNCTION__ which is like standard __FUNCTION__ but defined as
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NULL for the compilers which don't support the latter.
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*/
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#ifndef __WXFUNCTION__
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#if defined(__GNUC__) || \
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defined(__VISUALC__) || \
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defined(__FUNCTION__)
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#define __WXFUNCTION__ __FUNCTION__
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#else
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/* still define __WXFUNCTION__ to avoid #ifdefs elsewhere */
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#define __WXFUNCTION__ (NULL)
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#endif
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#endif /* __WXFUNCTION__ already defined */
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/* Auto-detect variadic macros support unless explicitly disabled. */
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#if !defined(HAVE_VARIADIC_MACROS) && !defined(wxNO_VARIADIC_MACROS)
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/* Any C99 or C++11 compiler should have them. */
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#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || \
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(defined(__cplusplus) && __cplusplus >= 201103L)
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#define HAVE_VARIADIC_MACROS 1
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#elif defined(__GNUC__)
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#define HAVE_VARIADIC_MACROS 1
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#elif wxCHECK_VISUALC_VERSION(8)
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#define HAVE_VARIADIC_MACROS 1
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#endif
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#endif /* !HAVE_VARIADIC_MACROS */
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#ifdef HAVE_VARIADIC_MACROS
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/*
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wxCALL_FOR_EACH(what, ...) calls the macro from its first argument, what(pos, x),
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for every remaining argument 'x', with 'pos' being its 1-based index in
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*reverse* order (with the last argument being numbered 1).
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For example, wxCALL_FOR_EACH(test, a, b, c) expands into this:
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test(3, a) \
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test(2, b) \
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test(1, c)
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Up to eight arguments are supported.
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(With thanks to https://groups.google.com/d/topic/comp.std.c/d-6Mj5Lko_s/discussion
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and https://stackoverflow.com/questions/1872220/is-it-possible-to-iterate-over-arguments-in-variadic-macros)
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*/
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#define wxCALL_FOR_EACH_NARG(...) wxCALL_FOR_EACH_NARG_((__VA_ARGS__, wxCALL_FOR_EACH_RSEQ_N()))
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#define wxCALL_FOR_EACH_NARG_(args) wxCALL_FOR_EACH_ARG_N args
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#define wxCALL_FOR_EACH_ARG_N(_1, _2, _3, _4, _5, _6, _7, _8, N, ...) N
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#define wxCALL_FOR_EACH_RSEQ_N() 8, 7, 6, 5, 4, 3, 2, 1, 0
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#define wxCALL_FOR_EACH_1_(args) wxCALL_FOR_EACH_1 args
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#define wxCALL_FOR_EACH_2_(args) wxCALL_FOR_EACH_2 args
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#define wxCALL_FOR_EACH_3_(args) wxCALL_FOR_EACH_3 args
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#define wxCALL_FOR_EACH_4_(args) wxCALL_FOR_EACH_4 args
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#define wxCALL_FOR_EACH_5_(args) wxCALL_FOR_EACH_5 args
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#define wxCALL_FOR_EACH_6_(args) wxCALL_FOR_EACH_6 args
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#define wxCALL_FOR_EACH_7_(args) wxCALL_FOR_EACH_7 args
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#define wxCALL_FOR_EACH_8_(args) wxCALL_FOR_EACH_8 args
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#define wxCALL_FOR_EACH_1(what, x) what(1, x)
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#define wxCALL_FOR_EACH_2(what, x, ...) what(2, x) wxCALL_FOR_EACH_1_((what, __VA_ARGS__))
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#define wxCALL_FOR_EACH_3(what, x, ...) what(3, x) wxCALL_FOR_EACH_2_((what, __VA_ARGS__))
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#define wxCALL_FOR_EACH_4(what, x, ...) what(4, x) wxCALL_FOR_EACH_3_((what, __VA_ARGS__))
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#define wxCALL_FOR_EACH_5(what, x, ...) what(5, x) wxCALL_FOR_EACH_4_((what, __VA_ARGS__))
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#define wxCALL_FOR_EACH_6(what, x, ...) what(6, x) wxCALL_FOR_EACH_5_((what, __VA_ARGS__))
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#define wxCALL_FOR_EACH_7(what, x, ...) what(7, x) wxCALL_FOR_EACH_6_((what, __VA_ARGS__))
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#define wxCALL_FOR_EACH_8(what, x, ...) what(8, x) wxCALL_FOR_EACH_7_((what, __VA_ARGS__))
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#define wxCALL_FOR_EACH_(N, args) \
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wxCONCAT(wxCALL_FOR_EACH_, N) args
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#define wxCALL_FOR_EACH(what, ...) \
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wxCALL_FOR_EACH_(wxCALL_FOR_EACH_NARG(__VA_ARGS__), (what, __VA_ARGS__))
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#else
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#define wxCALL_FOR_EACH Error_wx_CALL_FOR_EACH_requires_variadic_macros_support
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#endif /* HAVE_VARIADIC_MACROS */
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#endif /* _WX_CPP_H_ */
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