+//
+// 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 run-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__)
+ /* 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); } \
+ }
+#elif defined( __VMS )
+namespace wxdebug{
+
+// HP aCC cannot deal with missing names for template value parameters
+template <bool x> struct STATIC_ASSERTION_FAILURE;
+
+template <> struct STATIC_ASSERTION_FAILURE<true> { enum { value = 1 }; };
+
+// HP aCC cannot deal with missing names for template value parameters
+template<int x> struct static_assert_test{};
+
+}
+ #define WX_JOIN( X, Y ) X##Y
+ #define WX_STATIC_ASSERT_BOOL_CAST(x) (bool)(x)
+ #define wxCOMPILE_TIME_ASSERT(expr, msg) \
+ typedef ::wxdebug::static_assert_test<\
+ sizeof(::wxdebug::STATIC_ASSERTION_FAILURE< WX_STATIC_ASSERT_BOOL_CAST( expr ) >)>\
+ WX_JOIN(wx_static_assert_typedef_, __LINE__)
+#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; }
+
+// helpers for wxCOMPILE_TIME_ASSERT below, for private use only
+#define wxMAKE_BITSIZE_MSG(type, size) type ## SmallerThan ## size ## Bits
+
+// a special case of compile time assert: check that the size of the given type
+// is at least the given number of bits
+#define wxASSERT_MIN_BITSIZE(type, size) \
+ wxCOMPILE_TIME_ASSERT(sizeof(type) * CHAR_BIT >= size, \
+ wxMAKE_BITSIZE_MSG(type, size))
+
+
+// ----------------------------------------------------------------------------
+// other miscellaneous debugger-related functions
+// ----------------------------------------------------------------------------
+
+/*
+ Return true if we're running under debugger.
+
+ Currently this only really works under Win32 and Mac in CodeWarrior builds,
+ it always returns false in other cases.
+ */
+#if defined(__WXMAC__) || defined(__WIN32__)
+ extern bool WXDLLIMPEXP_BASE wxIsDebuggerRunning();
+#else // !Mac
+ inline bool wxIsDebuggerRunning() { return false; }
+#endif // Mac/!Mac
+
+// An assert helper used to avoid warning when testing constant expressions,
+// i.e. wxASSERT( sizeof(int) == 4 ) can generate a compiler warning about
+// expression being always true, but not using
+// wxASSERT( wxAssertIsEqual(sizeof(int), 4) )
+//
+// NB: this is made obsolete by wxCOMPILE_TIME_ASSERT() and should no
+// longer be used.
+extern bool WXDLLIMPEXP_BASE wxAssertIsEqual(int x, int y);
+
+// Use of wxFalse instead of false suppresses compiler warnings about testing
+// constant expression
+extern WXDLLIMPEXP_DATA_BASE(const bool) wxFalse;
+
+#define wxAssertFailure wxFalse
+
+// This is similar to WXUNUSED() and useful for parameters which are only used
+// in assertions.
+#if wxDEBUG_LEVEL
+ #define WXUNUSED_UNLESS_DEBUG(param) param
+#else
+ #define WXUNUSED_UNLESS_DEBUG(param) WXUNUSED(param)
+#endif
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