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Preprocessor: predefined macros

__COUNTER__

__FUNCTION__, __FILE__ and __LINE__.

__cplusplus

In order to describe the wchar_t datatype, there is WCHAR_MAX (and further macros such as __WCHAR_MAX__ and __WCHAR_TYPE__ in gcc).

Print predefined macros on the command line

With the GNU compiler's command line option -dM, it's possible to quickly show the values of predefined macros..

For example, in PowerShell like so:

write-output '' | g++ -dM -E -x c++  -

Compare wtih Possibly predefined preprocessor macros

Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php:78 Stack trace: #0 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(78): PDOStatement->execute(Array) #1 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(30): insert_webrequest_('/notes/developm...', 1745915927, '18.188.54.133', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/development/languages/C-C-plus-plus/preprocessor/macros/predefined/index(57): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78

Preprocessor: predefined macros

Print predefined macros on the command line

See also