General Barron/Sandbox – User
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Notes on preprocessor directives in .sqf files (WIP for wiki page):
Linky: http://www.cplusplus.com/doc/tutorial/preprocessor.html
NOTE: all preprocessor directives are run BEFORE the script is run. So you can't expect it to read the value of variables, for example. Preprocessing basically just does find, replace, and paste operations in your code.
Macro definitions (#define, #undef): these work as described. Note that the two special operators (# and ##) work as well.
When including defines in defines, the # operator works after expanding all defines. For example:
- define fn_myfunc compile preprocessfile 'myfile.sqf'
- define addquotes(x) #x
addquotes(call fn_myfunc) result is: "call compile preprocessfile 'myfile.sqf'"
Multi-line notes:
To spread a define across mult lines, add \ at the end of each line (save the last). Example:
- define whatever \
dosomething; \ dosomething else
Comments:
Comments work at the end of single line defines, but not multi-line defines. Example:
- define something "whatever" //comment
(this works)
- define something \ //comment
"whatever" (this doesn't work!!!)
Nested defines:
Defines can be nested in each other, and they are all expanded. You can't seem to put a multi-line define inside of a multi-line define, nor can you pass a multi-line define in as a parameter of a macro.
Conditional inclusions (#ifdef, #ifndef, #if, #endif, #else and #elif)
- ifdef, #ifndef, #endif all work in configs, and I would assume in scripts as well. I haven't verified #else #elif or #if.
Line control (#line) Error directive (#error) Pragma directive (#pragma)
Doesn't seem to work? At least not in scripts.
In scripts, using any unknown # directive seems to cause the entire file to be returned as empty when preprocessed. Ex: placing #asdf or #error, etc, in a script will make it turn into {} when preprocessed. When combined with #ifdef and #ifndef operators, this could be a useful feature.
Need to verify what happens in configs with this!
Source file inclusion (#include)
This obviously works, and is very useful. For example, you can make a common header file for all your scripts. In this header you can #define constants, rather than having to use variables to store them. Also very useful for #defining a descriptive name for numbers such as IDCs and array indexes.
I'm not sure about the difference between "" and <> includes. Normally I use "".
Note that the path (at least with "") is relative to the directory of the file where you issue the #include.
HOWEVER, if you put a \ slash at the beginning, the path will instead be relative to your vbs2.exe / arma.exe. In this way you can include files that are directly in your install directory.
You can also #include stuff that is in addon / pbo files in this way. In this case, the path should be the path to the file when it is in your P: drive (i.e. before the pbo is packed), minus the P:. Example: "\vbs2\customer\vehicles\myvehicle\data\scripts\myscript.sqf"
Predefined macro names
__LINE__ and __FILE__ both WORK when used in .sqf! Very cool!
The others don't work though. I need to check to see if these work in configs.
Configs have the __EXEC and __EVAL macros predefined. These macros allow the use of variables and simple scripting expressions within configs (string concatenation, while loops, math operations, etc). See other wiki for documentation on these. These macros do NOT work in scripts! These macros work even if the config isn't cfgConverted.