test for wxLog interaction with wxYield better

[wxWidgets.git] / include / wx / debug.h

diff --git a/include/wx/debug.h b/include/wx/debug.h
index 2f65767f4ec7f1ce053151b69fa543cdf6b4d8ab..9010e74c63ef08bd5f88d9ad6316c3ec5e6d022f 100644 (file)
--- a/include/wx/debug.h
+++ b/include/wx/debug.h
@@ -1,103 +1,134 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        debug.h
+// Name:        wx/debug.h

 // Purpose:     Misc debug functions and macros
 // Author:      Vadim Zeitlin
 // Modified by:
 // Created:     29/01/98
 // RCS-ID:      $Id$
 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
 // Purpose:     Misc debug functions and macros
 // Author:      Vadim Zeitlin
 // Modified by:
 // Created:     29/01/98
 // RCS-ID:      $Id$
 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>

-// Licence:    wxWindows license
+// Licence:     wxWindows license

 /////////////////////////////////////////////////////////////////////////////
 
 /////////////////////////////////////////////////////////////////////////////
 

-#ifndef   __WXDEBUGH__
-#define   __WXDEBUGH__
+#ifndef   _WX_DEBUG_H_
+#define   _WX_DEBUG_H_

 
 #include  <assert.h>
 
 
 #include  <assert.h>
 

+#include  "wx/wxchar.h"
+

 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------

-/** 
-  @name Debugging macros 
-
-  All debugging macros rely on ASSERT() which in turn calls user-defined
-  OnAssert() function. To keep things simple, it's called even when the
-  expression is TRUE (i.e. everything is ok) and by default does nothing: just
-  returns the same value back. But if you redefine it to do something more sexy
-  (popping up a message box in your favourite GUI, sending you e-mail or 
-  whatever) it will affect all ASSERTs, FAILs and CHECKs in your code.
-  <BR>
-  <BR>
-  <b>Warning</b>: if you don't like advices on programming style, don't read 
-  further! ;-)
-  <BR>
-  <BR>
-  Extensive use of these macros is recommended! Remember that ASSERTs are
-  disabled in final (without WXDEBUG defined) build, so they add strictly
-  nothing to your program's code. On the other hand, CHECK macros do stay
-  even in release builds, but in general are not much of a burden, while
-  a judicious use of them might increase your program's stability.
-
-  @memo Debugging macros (replacement for standard assert()) and more.
-  */
+// Debugging macros
+//
+// All debugging macros rely on ASSERT() which in turn calls user-defined
+// OnAssert() function. To keep things simple, it's called even when the
+// expression is TRUE (i.e. everything is ok) and by default does nothing: just
+// returns the same value back. But if you redefine it to do something more sexy
+// (popping up a message box in your favourite GUI, sending you e-mail or
+// whatever) it will affect all ASSERTs, FAILs and CHECKs in your code.
+//
+// Warning: if you don't like advices on programming style, don't read
+// further! ;-)
+//
+// Extensive use of these macros is recommended! Remember that ASSERTs are
+// disabled in final (without __WXDEBUG__ defined) build, so they add strictly
+// nothing to your program's code. On the other hand, CHECK macros do stay
+// even in release builds, but in general are not much of a burden, while
+// a judicious use of them might increase your program's stability.

 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------

-//@{

 
 

-/** @name Macros which are completely disabled in 'release' mode */
-//@{
+// Use of these suppresses compiler warnings about testing constant expression
+WXDLLEXPORT_DATA(extern const bool) wxTrue;
+WXDLLEXPORT_DATA(extern const bool) wxFalse;
+
+// Macros which are completely disabled in 'release' mode
+//
+// NB: these functions are implemented in src/common/appcmn.cpp

 #ifdef  __WXDEBUG__
 #ifdef  __WXDEBUG__

-  /**
-  this function may be redefined to do something non trivial and is called
-  whenever one of debugging macros fails (i.e. condition is false in an
-  assertion)
-  @param   szFile and nLine - file name and line number of the ASSERT
-           szMsg            - optional message explaining the reason
+  /*
+    this function may be redefined to do something non trivial and is called
+    whenever one of debugging macros fails (i.e. condition is false in an
+    assertion)
+
+    parameters:
+       szFile and nLine - file name and line number of the ASSERT
+       szMsg            - optional message explaining the reason
+  */
+  extern void WXDLLEXPORT wxOnAssert(const wxChar *szFile,
+                                     int nLine,
+                                     const wxChar *szMsg = NULL);
+
+  // call this function to break into the debugger uncodnitionally (assuming
+  // the program is running under debugger, of course)
+  extern void WXDLLEXPORT wxTrap();
+
+  /*
+    notice the usage of else at the end of wxASSERT macro: this ensures that
+    the following code
+
+        if ( ... )
+            wxASSERT(...);
+        else
+            ...
+
+    works like expected: if there were no "else", the one in the code above
+    would be matched with a wrong "if"

   */
   */

-  void wxOnAssert(const char *szFile, int nLine, const char *szMsg = NULL);

 
 

-  /// generic assert macro
-  #define   wxASSERT(cond)   if ( !(cond) ) wxOnAssert(__FILE__, __LINE__)
-  /// assert with additional message explaining it's cause 
-  #define   wxASSERT_MSG(x, m)  if ( !(x) ) wxOnAssert(__FILE__, __LINE__, m)
+  // generic assert macro
+  #define wxASSERT(cond) if ( !(cond) ) wxOnAssert(__TFILE__, __LINE__); else
+
+  // assert with additional message explaining it's cause
+  #define wxASSERT_MSG(cond, msg) \
+                    if ( !(cond) ) wxOnAssert(__TFILE__, __LINE__, msg); else
+
+  // 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) )
+  extern bool WXDLLEXPORT wxAssertIsEqual(int x, int y);

 #else
 #else

+  #define wxTrap()
+

   // nothing to do in release modes (hopefully at this moment there are
   // no more bugs ;-)
   // nothing to do in release modes (hopefully at this moment there are
   // no more bugs ;-)

-  #define   wxASSERT(cond)
-  #define   wxASSERT_MSG(x, m)
-#endif  //WXDEBUG
+  #define wxASSERT(cond)
+  #define wxASSERT_MSG(x, m)
+#endif  //__WXDEBUG__
+
+// special form of assert: always triggers it (in debug mode)
+#define wxFAIL                 wxASSERT(wxFalse)

 
 

-  /// special form of assert: always triggers it (in debug mode)
-#define   wxFAIL                 wxASSERT(0)
-  /// FAIL with some message
-#define   wxFAIL_MSG(msg)        wxASSERT_MSG(0, msg)
-//@}
+// FAIL with some message
+#define wxFAIL_MSG(msg)        wxASSERT_MSG(wxFalse, msg)

 
 

-// NB: these macros work also in release mode!
+// NB: the following macros work also in release mode!

 
 

-/** 
+/*

   These macros must be used only in invalid situation: for example, an
   invalid parameter (NULL pointer) is passed to a function. Instead of
   dereferencing it and causing core dump the function might try using
   CHECK( p != NULL ) or CHECK( p != NULL, return LogError("p is NULL!!") )
   These macros must be used only in invalid situation: for example, an
   invalid parameter (NULL pointer) is passed to a function. Instead of
   dereferencing it and causing core dump the function might try using
   CHECK( p != NULL ) or CHECK( p != NULL, return LogError("p is NULL!!") )

-
-  @name Macros which remain even in 'release' mode 

 */
 */

-//@{
-  /// check that expression is true, "return" if not (also FAILs in debug mode)
-#define   wxCHECK(x, rc)            if (!(x)) {wxFAIL; return rc; }
-  /// as wxCHECK but with a message explaining why we fail
-#define   wxCHECK_MSG(x, rc, msg)   if (!(x)) {wxFAIL_MSG(msg); return rc; }
-  /// check that expression is true, perform op if not
-#define   wxCHECK2(x, op)           if (!(x)) {wxFAIL; op; }
-  /// as wxCHECK2 but with a message explaining why we fail
-#define   wxCHECK2_MSG(x, op, msg)  if (!(x)) {wxFAIL_MSG(msg); op; }
-  /// 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(x, msg)       if (!(x)) {wxFAIL_MSG(msg); return; }
-//@}
-
-//@}
-
-#endif  // __WXDEBUGH__
+
+// check that expression is true, "return" if not (also FAILs in debug mode)
+#define wxCHECK(x, rc)            if (!(x)) {wxFAIL; return rc; }
+
+// as wxCHECK but with a message explaining why we fail
+#define wxCHECK_MSG(x, rc, msg)   if (!(x)) {wxFAIL_MSG(msg); return rc; }
+
+// check that expression is true, perform op if not
+#define wxCHECK2(x, op)           if (!(x)) {wxFAIL; op; }
+
+// as wxCHECK2 but with a message explaining why we fail
+#define wxCHECK2_MSG(x, op, msg)  if (!(x)) {wxFAIL_MSG(msg); op; }
+
+// 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(x, msg)       if (!(x)) {wxFAIL_MSG(msg); return; }
+
+#endif  // _WX_DEBUG_H_