// Created: 29/01/98
// RCS-ID: $Id$
// Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
-// Licence: wxWindows license
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_DEBUG_H_
#define _WX_DEBUG_H_
+#ifndef __WXWINCE__
#include <assert.h>
+#endif
+#include <limits.h> // for CHAR_BIT used below
-#include "wx/wxchar.h"
+#include "wx/wxchar.h" // for __TFILE__ and wxChar
// ----------------------------------------------------------------------------
// Defines controlling the debugging macros
*/
extern void WXDLLEXPORT wxOnAssert(const wxChar *szFile,
int nLine,
+ const wxChar *szCond,
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"
- */
+ // helper function used to implement wxASSERT and wxASSERT_MSG
+ //
+ // note using "int" and not "bool" for cond to avoid VC++ warnings about
+ // implicit conversions when doing "wxAssert( pointer )" and also use of
+ // "!!cond" below to ensure that everything is converted to int
+ extern void WXDLLEXPORT wxAssert(int cond,
+ const wxChar *szFile,
+ int nLine,
+ const wxChar *szCond,
+ const wxChar *szMsg = NULL) ;
// generic assert macro
- #define wxASSERT(cond) if ( !(cond) ) wxOnAssert(__TFILE__, __LINE__); else
+ #define wxASSERT(cond) wxAssert(!!(cond), __TFILE__, __LINE__, _T(#cond))
// assert with additional message explaining it's cause
#define wxASSERT_MSG(cond, msg) \
- if ( !(cond) ) wxOnAssert(__TFILE__, __LINE__, msg); else
+ wxAssert(!!(cond), __TFILE__, __LINE__, _T(#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 shouldn't be
+ // used any longer
extern bool WXDLLEXPORT wxAssertIsEqual(int x, int y);
#else
#define wxTrap()
// Use of wxFalse instead of FALSE suppresses compiler warnings about testing
// constant expression
WXDLLEXPORT_DATA(extern const bool) wxFalse;
+#define wxAssertFailure wxFalse
// special form of assert: always triggers it (in debug mode)
-#define wxFAIL wxASSERT(wxFalse)
+#define wxFAIL wxASSERT(wxAssertFailure)
// FAIL with some message
-#define wxFAIL_MSG(msg) wxASSERT_MSG(wxFalse, msg)
+#define wxFAIL_MSG(msg) wxASSERT_MSG(wxAssertFailure, msg)
// NB: the following macros work also in release mode!
// to begin with...)
#define wxCHECK_RET(x, msg) if (!(x)) {wxFAIL_MSG(msg); return; }
+// ----------------------------------------------------------------------------
+// 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!).
+ The _n__ part is to stop VC++ 7 being confused since it encloses __LINE++ in
+ parentheses. Unfortunately this does not work with other compilers, so
+ we will only enable it when we know the _precise_ symbols to test for.
+ */
+
+#define wxMAKE_ASSERT_NAME_HELPER(line) wxAssert_ ## line
+#define wxMAKE_ASSERT_NAME(line) wxMAKE_ASSERT_NAME_HELPER(line)
+#if 0
+#define wxMAKE_UNIQUE_ASSERT_NAME wxMAKE_ASSERT_NAME(_n___ ## __LINE__)
+#else
+#define wxMAKE_UNIQUE_ASSERT_NAME wxMAKE_ASSERT_NAME(__LINE__)
+#endif
+#define wxMAKE_UNIQUE_ASSERT_NAME2(text) wxMAKE_ASSERT_NAME(text)
+
+/*
+ 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.
+*/
+#define wxCOMPILE_TIME_ASSERT(expr, msg) \
+ struct wxMAKE_UNIQUE_ASSERT_NAME { unsigned int msg: expr; }
+
+#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))
+
#endif // _WX_DEBUG_H_
projects / wxWidgets.git / blobdiff