+/* check that expression is true, "return" if not (also FAILs in debug mode) */
+#define wxCHECK(cond, rc) wxCHECK_MSG(cond, rc, NULL)
+
+/* as wxCHECK but with a message explaining why we fail */
+#define wxCHECK_MSG(cond, rc, msg) wxCHECK2_MSG(cond, return rc, msg)
+
+/* check that expression is true, perform op if not */
+#define wxCHECK2(cond, op) wxCHECK2_MSG(cond, op, NULL)
+
+/* as wxCHECK2 but with a message explaining why we fail */
+#define wxCHECK2_MSG(cond, op, msg) \
+ if ( cond ) \
+ ; \
+ else \
+ { \
+ wxFAIL_COND_MSG(#cond, msg); \
+ op; \
+ } \
+ struct wxDummyCheckStruct /* just to force a semicolon */
+
+/* special form of wxCHECK2: as wxCHECK, but for use in void functions */
+/* */
+/* NB: there is only one form (with msg parameter) and it's intentional: */
+/* there is no other way to tell the caller what exactly went wrong */
+/* from the void function (of course, the function shouldn't be void */
+/* to begin with...) */
+#define wxCHECK_RET(cond, msg) wxCHECK2_MSG(cond, return, msg)
+
+/* ---------------------------------------------------------------------------- */
+/* Compile time asserts */
+/* */
+/* Unlike the normal assert and related macros above which are checked during */
+/* the program tun-time the macros below will result in a compilation error if */
+/* the condition they check is false. This is usually used to check the */
+/* expressions containing sizeof()s which cannot be tested with the */
+/* preprocessor. If you can use the #if's, do use them as you can give a more */
+/* detailed error message then. */
+/* ---------------------------------------------------------------------------- */
+
+/*
+ How this works (you don't have to understand it to be able to use the
+ macros): we rely on the fact that it is invalid to define a named bit field
+ in a struct of width 0. All the rest are just the hacks to minimize the
+ possibility of the compiler warnings when compiling this macro: in
+ particular, this is why we define a struct and not an object (which would
+ result in a warning about unused variable) and a named struct (otherwise we'd
+ get a warning about an unnamed struct not used to define an object!).
+ */
+
+#define wxMAKE_UNIQUE_ASSERT_NAME wxMAKE_UNIQUE_NAME(wxAssert_)
+
+/*
+ The second argument of this macro must be a valid C++ identifier and not a
+ string. I.e. you should use it like this:
+
+ wxCOMPILE_TIME_ASSERT( sizeof(int) >= 2, YourIntsAreTooSmall );
+
+ It may be used both within a function and in the global scope.
+*/
+#if defined(__WATCOMC__) && defined(__cplusplus)
+ /* avoid "unused symbol" warning */
+ #define wxCOMPILE_TIME_ASSERT(expr, msg) \
+ class wxMAKE_UNIQUE_ASSERT_NAME { \
+ unsigned int msg: expr; \
+ wxMAKE_UNIQUE_ASSERT_NAME() { wxUnusedVar(msg); } \
+ }
+#else
+ #define wxCOMPILE_TIME_ASSERT(expr, msg) \
+ struct wxMAKE_UNIQUE_ASSERT_NAME { unsigned int msg: expr; }
+#endif
+
+/*
+ When using VC++ 6 with "Edit and Continue" on, the compiler completely
+ mishandles __LINE__ and so wxCOMPILE_TIME_ASSERT() doesn't work, provide a
+ way to make "unique" assert names by specifying a unique prefix explicitly
+ */
+#define wxMAKE_UNIQUE_ASSERT_NAME2(text) wxCONCAT(wxAssert_, text)
+
+#define wxCOMPILE_TIME_ASSERT2(expr, msg, text) \
+ struct wxMAKE_UNIQUE_ASSERT_NAME2(text) { unsigned int msg: expr; }
projects / wxWidgets.git / blobdiff