X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/258593354e0a19bb74e23d7978fdc01da1942b2a..ca77701441e39245dcbfce903049e76f166979e5:/include/wx/cpp.h diff --git a/include/wx/cpp.h b/include/wx/cpp.h index eb012f5308..9fed106a76 100644 --- a/include/wx/cpp.h +++ b/include/wx/cpp.h @@ -15,11 +15,23 @@ /* wxCONCAT works like preprocessor ## operator but also works with macros */ #define wxCONCAT_HELPER(text, line) text ## line -#define wxCONCAT(text, line) wxCONCAT_HELPER(text, line) -#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 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 @@ -67,6 +79,28 @@ */ #define wxEMPTY_PARAMETER_VALUE /* Fake macro parameter value */ +/* + Helpers for defining macros that expand into a single statement. + + The standatd solution is to use "do { ... } while (0)" statement but MSVC + generates a C4127 "condition expression is constant" warning for it so we + use something which is just complicated enough to not be recognized as a + constant but still simple enough to be optimized away. + + Another solution would be to use __pragma() to temporarily disable C4127. + + Notice that wxASSERT_ARG_TYPE in wx/strvargarg.h relies on these macros + creating some kind of a loop because it uses "break". + */ +#ifdef __WATCOMC__ + #define wxFOR_ONCE(name) for(int name=0; name<1; name++) + #define wxSTATEMENT_MACRO_BEGIN wxFOR_ONCE(wxMAKE_UNIQUE_NAME(wxmacro)) { + #define wxSTATEMENT_MACRO_END } +#else + #define wxSTATEMENT_MACRO_BEGIN do { + #define wxSTATEMENT_MACRO_END } while ( (void)0, 0 ) +#endif + /* Define __WXFUNCTION__ which is like standard __FUNCTION__ but defined as NULL for the compilers which don't support the latter. @@ -89,5 +123,56 @@ #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_ */