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[22] Inserting meta-comments in FWEB files?

Johannes Muller reported strange output from fweave when defining two macros debug and gubed to enclose optional code for debugging purposes. As his global language, he chose C++.

@m debug @(
@m gubed @)

@f debug do

@f gubed while

This worked fine for him using WEB with Pascal. `@(' and `@)' are control codes which mark the begin and end of a meta-comment, i.e. commented out code that will appear in the output file [M-11.38]. Though I wasn't able to reproduce his errors, it should be remarked that the preferred way is to use the WEB preprocessor construction `@#if(0) ... @#endif' instead.

JAK: ``That Muller's example doesn't work probably points out a problem with the macro preprocessor''.

For debugging purposes, one can bracket pieces of code by `@#ifdef DEBUG ... @#endif', switching on DEBUG

by the commandline flag `-mDEBUG' for ftangle [M-7.5].

Archive-Date: Thu, 01 Oct 1992 07:49:37 CDT