The following predefined macros are always predefined by the compiler. Unless noted otherwise, all the following macros are protected, which means that the compiler will issue a warning if you try to undefine or redefine them.
| Predefined macro name | Description | Predefined value |
|---|---|---|
| __BASE_FILE__ | Indicates the name of the primary source file. | The fully qualified file name of the primary source file. |
| __DATE__ | Indicates the date that the source file was preprocessed. | A character string containing the date when the source file was preprocessed. |
| __FILE__ | Indicates the name of the preprocessed source file. | A character string containing the name of the preprocessed source file. |
| __FUNCTION__ | Indicates the name of the function currently being compiled. | A character string containing the name of the function currently being compiled. |
| __LINE__ | Indicates the current line number in the source file. | An integer constant containing the line number in the source file. |
| __SIZE_TYPE__ | Indicates the underlying type of size_t on the current platform. Not protected. | unsigned int in 32-bit compilation mode and unsigned long in 64-bit compilation mode. |
| __TIME__ | Indicates the time that the source file was preprocessed. | A character string containing the time when the source file was preprocessed. |
| __TIMESTAMP__ | Indicates the date and time when the source file was last modified. The value changes as the compiler processes any include files that are part of your source program. | A character string literal in the form "Day Mmm dd hh:mm:ss yyyy",
where::
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