Finally fixed control scrolling

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

diff --git a/include/wx/debug.h b/include/wx/debug.h
index 82785eca9b8dab8827d35cfbca8dc766862e87aa..b5854654c391eb7410abecec27d216e19b9d3926 100644 (file)
--- a/include/wx/debug.h
+++ b/include/wx/debug.h
@@ -1,132 +1,359 @@
-/////////////////////////////////////////////////////////////////////////////
-// 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>
-// Licence:     wxWindows license
-/////////////////////////////////////////////////////////////////////////////
+/**
+*  Name:        wx/debug.h
+*  Purpose:     Misc debug functions and macros
+*  Author:      Vadim Zeitlin
+*  Modified by: Ryan Norton (Converted to C)
+*  Created:     29/01/98
+*  RCS-ID:      $Id$
+*  Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
+*  Licence:     wxWindows licence
+*/
+
+/* THIS IS A C FILE, DON'T USE C++ FEATURES (IN PARTICULAR COMMENTS) IN IT */

 
 #ifndef   _WX_DEBUG_H_
 #define   _WX_DEBUG_H_
 
 
 #ifndef   _WX_DEBUG_H_
 #define   _WX_DEBUG_H_
 

+#ifndef __WXWINCE__

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

+#endif
+#include  <limits.h>            /*  for CHAR_BIT used below */
+
+#include  "wx/chartype.h"     /*  for __TFILE__ and wxChar */
+
+/*  ---------------------------------------------------------------------------- */
+/*  Defines controlling the debugging macros */
+/*  ---------------------------------------------------------------------------- */
+
+/*  if _DEBUG is defined (MS VC++ and others use it in debug builds), define */
+/*  __WXDEBUG__ too */
+#ifdef _DEBUG
+    #ifndef __WXDEBUG__
+        #define __WXDEBUG__
+    #endif /*  !__WXDEBUG__ */
+#endif /*  _DEBUG */
+
+/*  if NDEBUG is defined (<assert.h> uses it), undef __WXDEBUG__ and WXDEBUG */
+#ifdef NDEBUG
+    #undef __WXDEBUG__
+    #undef WXDEBUG
+#endif /*  NDEBUG */

 
 

-#include  "wx/wxchar.h"
-
-// ----------------------------------------------------------------------------
-// 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.
-// ----------------------------------------------------------------------------
-
-// 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
-#ifdef  __WXDEBUG__
+/*  if __WXDEBUG__ is defined, make sure that WXDEBUG is defined and >= 1 */
+#ifdef __WXDEBUG__
+    #if !defined(WXDEBUG) || !WXDEBUG
+        #undef WXDEBUG
+        #define WXDEBUG 1
+    #endif /*  !WXDEBUG */
+#endif /*  __WXDEBUG__ */
+
+#ifndef __WXFUNCTION__
+    /* TODO: add more compilers supporting __FUNCTION__ */
+    #if defined(__DMC__)
+        /* 
+           __FUNCTION__ happens to be not defined within class members
+           http://www.digitalmars.com/drn-bin/wwwnews?c%2B%2B.beta/485
+        */
+        #define __WXFUNCTION__ (NULL)
+    #elif defined(__GNUC__) || \
+          (defined(_MSC_VER) && _MSC_VER >= 1300) || \
+          defined(__FUNCTION__)
+        #define __WXFUNCTION__ __FUNCTION__
+    #else
+        /* still define __WXFUNCTION__ to avoid #ifdefs elsewhere */
+        #define __WXFUNCTION__ (NULL)
+    #endif
+#endif /* __WXFUNCTION__ already defined */
+
+/*  ---------------------------------------------------------------------------- */
+/*  Debugging macros */
+/*  */
+/*  All debugging macros rely on ASSERT() which in turn calls the 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 advice on programming style, don't read */
+/*  further! ;-) */
+/*  */
+/*  Extensive use of these macros is recommended! Remember that ASSERTs are */
+/*  disabled in final build (without __WXDEBUG__ defined), 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. */
+/*  ---------------------------------------------------------------------------- */
+
+/*  Macros which are completely disabled in 'release' mode */
+/*  */
+/*  NB: these functions are implemented in src/common/appcmn.cpp */
+#if defined(__cplusplus) && defined(__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)
+    This function is called whenever one of debugging macros fails (i.e.
+    condition is false in an assertion). To customize its behaviour, override
+    wxApp::OnAssertFailure().

 
 

-    parameters:
+    Parameters:

        szFile and nLine - file name and line number of the ASSERT
        szFile and nLine - file name and line number of the ASSERT

+       szFunc           - function name of the ASSERT, may be NULL (NB: ASCII)
+       szCond           - text form of the condition which failed

        szMsg            - optional message explaining the reason
   */
        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();
+  /* this version is for compatibility with wx 2.8 Unicode build only: */
+  extern void WXDLLIMPEXP_BASE wxOnAssert(const wxChar *szFile,
+                                          int nLine,
+                                          const char *szFunc,
+                                          const wxChar *szCond,
+                                          const wxChar *szMsg = NULL);

 
 

-  /*
-    notice the usage of else at the end of wxASSERT macro: this ensures that
-    the following code
+#if wxUSE_UNICODE
+  /* char versions are used by debugging macros; we have to provide
+     wxChar* szMsg version because it's common to use _T() in the macros
+     and finally, we can't use const wx(char)* szMsg = NULL, because that
+     would be ambiguous: */
+  extern void WXDLLIMPEXP_BASE wxOnAssert(const char *szFile,
+                                          int nLine,
+                                          const char *szFunc,
+                                          const char *szCond);

 
 

-        if ( ... )
-            wxASSERT(...);
-        else
-            ...
+  extern void WXDLLIMPEXP_BASE wxOnAssert(const char *szFile,
+                                          int nLine,
+                                          const char *szFunc,
+                                          const char *szCond,
+                                          const char *szMsg);

 
 

-    works like expected: if there were no "else", the one in the code above
-    would be matched with a wrong "if"
-  */
+  extern void WXDLLIMPEXP_BASE wxOnAssert(const char *szFile,
+                                          int nLine,
+                                          const char *szFunc,
+                                          const char *szCond,
+                                          const wxChar *szMsg);
+#endif // wxUSE_UNICODE
+
+  class WXDLLIMPEXP_BASE wxString;
+  class WXDLLIMPEXP_BASE wxCStrData;
+
+  /* these two work when szMsg passed to debug macro is a string,
+     we also have to provide wxCStrData overload to resolve ambiguity
+     which would otherwise arise from wxASSERT( s.c_str() ): */
+  extern void WXDLLIMPEXP_BASE wxOnAssert(const wxString& szFile,
+                                          int nLine,
+                                          const wxString& szFunc,
+                                          const wxString& szCond,
+                                          const wxString& szMsg);
+
+  extern void WXDLLIMPEXP_BASE wxOnAssert(const wxString& szFile,
+                                          int nLine,
+                                          const wxString& szFunc,
+                                          const wxString& szCond);
+
+  extern void WXDLLIMPEXP_BASE wxOnAssert(const char *szFile,
+                                          int nLine,
+                                          const char *szFunc,
+                                          const char *szCond,
+                                          const wxCStrData& msg);
+
+  extern void WXDLLIMPEXP_BASE wxOnAssert(const char *szFile,
+                                          int nLine,
+                                          const char *szFunc,
+                                          const char *szCond,
+                                          const wxString& szMsg);
+
+  /*  call this function to break into the debugger unconditionally (assuming */
+  /*  the program is running under debugger, of course) */
+  extern void WXDLLIMPEXP_BASE wxTrap();
+
+  /*  generic assert macro */
+  #define wxASSERT(cond) wxASSERT_MSG(cond, (const char*)NULL)
+
+
+  /*  assert with additional message explaining its cause */
+
+  /*  compilers can give a warning (such as "possible unwanted ;") when using */
+  /*  the default definition of wxASSERT_MSG so we provide an alternative */
+  #if defined(__MWERKS__)
+    #define wxASSERT_MSG(cond, msg)                                           \
+      if ( cond )                                                             \
+      {}                                                                      \
+      else                                                                    \
+          wxOnAssert(__FILE__, __LINE__, __WXFUNCTION__, #cond, msg)
+  #else
+    #define wxASSERT_MSG(cond, msg)                                           \
+      if ( cond )                                                             \
+          ;                                                                   \
+      else                                                                    \
+          wxOnAssert(__FILE__, __LINE__, __WXFUNCTION__, #cond, msg)
+  #endif

 
 

-  // generic assert macro
-  #define wxASSERT(cond) if ( !(cond) ) wxOnAssert(__TFILE__, __LINE__); else
+  /*  special form of assert: always triggers it (in debug mode) */
+  #define wxFAIL wxFAIL_MSG((const char*)NULL)

 
 

-  // assert with additional message explaining it's cause
-  #define wxASSERT_MSG(cond, msg) \
-                    if ( !(cond) ) wxOnAssert(__TFILE__, __LINE__, msg); else
+  /*  FAIL with some message */
+  #define wxFAIL_MSG(msg) wxFAIL_COND_MSG("wxAssertFailure", msg)

 
 

-  // 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);
+  /*  FAIL with some message and a condition */
+  #define wxFAIL_COND_MSG(cond, msg)                                          \
+      wxOnAssert(__FILE__, __LINE__,  __WXFUNCTION__, cond, msg)
+
+  /*  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);

 #else
   #define wxTrap()
 
 #else
   #define wxTrap()
 

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

   #define wxASSERT(cond)
   #define wxASSERT(cond)

-  #define wxASSERT_MSG(x, m)
-#endif  //__WXDEBUG__
+  #define wxASSERT_MSG(cond, msg)
+  #define wxFAIL
+  #define wxFAIL_MSG(msg)
+  #define wxFAIL_COND_MSG(cond, msg)
+#endif  /* __WXDEBUG__ */

 
 

-// special form of assert: always triggers it (in debug mode)
-#define wxFAIL                 wxASSERT(wxFalse)
+#ifdef __cplusplus
+    /*  Use of wxFalse instead of false suppresses compiler warnings about testing */
+    /*  constant expression */
+    extern WXDLLIMPEXP_DATA_BASE(const bool) wxFalse;
+#endif

 
 

-// FAIL with some message
-#define wxFAIL_MSG(msg)        wxASSERT_MSG(wxFalse, msg)
+#define wxAssertFailure wxFalse

 
 

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

 
 /*
   These macros must be used only in invalid situation: for example, an
 
 /*
   These macros must be used only in invalid situation: for example, an

-  invalid parameter (NULL pointer) is passed to a function. Instead of
+  invalid parameter (e.g. a 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!!") )
 */
 
   dereferencing it and causing core dump the function might try using
   CHECK( p != NULL ) or CHECK( p != NULL, return LogError("p is NULL!!") )
 */
 

-// check that expression is true, "return" if not (also FAILs in debug mode)
-#define wxCHECK(x, rc)            if (!(x)) {wxFAIL; return rc; }
+/*  check that expression is true, "return" if not (also FAILs in debug mode) */
+#define wxCHECK(cond, rc)            wxCHECK_MSG(cond, rc, (const char*)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, (const char*)NULL)
+
+/*  as wxCHECK2 but with a message explaining why we fail */
+
+/* see comment near the definition of wxASSERT_MSG for the # if/else reason */
+#if defined(__MWERKS__)
+    #define wxCHECK2_MSG(cond, op, msg)                                       \
+        if ( cond )                                                           \
+        {}                                                                    \
+        else                                                                  \
+        {                                                                     \
+            wxFAIL_COND_MSG(#cond, msg);                                      \
+            op;                                                               \
+        }                                                                     \
+        struct wxDummyCheckStruct /* just to force a semicolon */
+#else
+    #define wxCHECK2_MSG(cond, op, msg)                                       \
+        if ( cond )                                                           \
+            ;                                                                 \
+        else                                                                  \
+        {                                                                     \
+            wxFAIL_COND_MSG(#cond, msg);                                      \
+            op;                                                               \
+        }                                                                     \
+        struct wxDummyCheckStruct /* just to force a semicolon */
+#endif

 
 

-// as wxCHECK but with a message explaining why we fail
-#define wxCHECK_MSG(x, rc, msg)   if (!(x)) {wxFAIL_MSG(msg); return rc; }
+/*  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)

 
 

-// check that expression is true, perform op if not
-#define wxCHECK2(x, op)           if (!(x)) {wxFAIL; op; }
+/*  ---------------------------------------------------------------------------- */
+/*  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:

 
 

-// as wxCHECK2 but with a message explaining why we fail
-#define wxCHECK2_MSG(x, op, msg)  if (!(x)) {wxFAIL_MSG(msg); op; }
+    wxCOMPILE_TIME_ASSERT( sizeof(int) >= 2, YourIntsAreTooSmall );

 
 

-// 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; }
+ 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; }
+
+/*  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.

 
 

-#endif  // _WX_DEBUG_H_
+    Currently this only really works under Win32 and Mac in CodeWarrior builds,
+    it always returns false in other cases.
+ */
+#ifdef __cplusplus
+    /* ABX: check __WIN32__ instead of __WXMSW__ for the same MSWBase in any Win32 port */
+    #if defined(__WXMAC__) || defined(__WIN32__)
+        extern bool WXDLLIMPEXP_BASE wxIsDebuggerRunning();
+    #else /*  !Mac */
+        inline bool wxIsDebuggerRunning() { return false; }
+    #endif /*  Mac/!Mac */
+#endif /* __cplusplus */

 
 

+#endif  /*  _WX_DEBUG_H_ */