X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/8b0bd21b3d4b68146272a124fcadfad02eba6599..ef094fa075bc56bcbc33b12159c395ea28afda3b:/include/wx/debug.h?ds=sidebyside diff --git a/include/wx/debug.h b/include/wx/debug.h index 85dee4be29..2a8a9b44bc 100644 --- a/include/wx/debug.h +++ b/include/wx/debug.h @@ -6,15 +6,18 @@ // Created: 29/01/98 // RCS-ID: $Id$ // Copyright: (c) 1998 Vadim Zeitlin -// Licence: wxWindows license +// Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// #ifndef _WX_DEBUG_H_ #define _WX_DEBUG_H_ +#ifndef __WXWINCE__ #include +#endif +#include // for CHAR_BIT used below -#include "wx/wxchar.h" +#include "wx/wxchar.h" // for __TFILE__ and wxChar // ---------------------------------------------------------------------------- // Defines controlling the debugging macros @@ -77,36 +80,38 @@ */ 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() @@ -120,12 +125,13 @@ // 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! @@ -156,5 +162,61 @@ WXDLLEXPORT_DATA(extern const bool) wxFalse; // 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_