FICO Xpress Optimization Examples Repository: Preprocessing Mosel code

It is possible to use standard C preprocessors such as cpp or m4 with Mosel. Mosel treats the preprocessor symbol '#' at the beginning of lines like a comment sign, with the exception of line numbers/positioning markers that are handled to obtain the original line numbers (see the discussion in Section 2.5.3 Line control directives of the Mosel Language Reference Manual).

Using a C preprocessor as prefix in compilation:

mosel comp "mmsystem.pipe:cpp preproc.mos -DA=1 -DDEBUG" -o preprocout.bim
mosel run preprocout

Using a C preprocessor to output model source:

cpp preproc.mos -DA=1 -DDEBUG -o preprocout.mos
mosel preprocout.mos

Template substitution: The Mosel program 'template.mos' implements a substitution mechanism that automatically specializes Mosel code by duplicating code portions, such as generating multiple versions of subroutines for different types. The file 'testtemplate_templ.mos' contains some examples of its use (see instructions in the respective file headers).

Difficulty rating: 3 (intermediate)

(!****************************************************** Mosel Example Problems ====================== file preproc.mos ```````````````` Example of using preprocessor definitions within a Mosel model !!! The C preprocessor 'cpp' must be available in order !!! to process this file before running it with Mosel Compile and run the resulting BIM file with: mosel comp "mmsystem.pipe:cpp preproc.mos -DA=1 -DDEBUG" -o preproc.bim mosel run preproc Produce the prepocessed source via cpp: cpp preproc.mos -DA=1 -DDEBUG -o preprocA1.mos (c) 2020-2022 Fair Isaac Corporation author: S. Heipcke, Aug. 2020, rev. Oct. 2022 *******************************************************!) model "preprocess via cpp" #ifdef A writeln("A defined") #if A==1 writeln("A is 1") #endif #else writeln("A not defined") #endif !writeln("Uncommenting this line produces a syntax error",,) #ifdef DEBUG writeln_("This is a debug message.") #endif writeln_("Terminating.") end-model