I am trying to use some code from Ronald Mak's Writing Compilers & Interpreters:
and this comes up with an errorCode:#define enter_name_local_symtab(name, &symtab_display[level]) \ idp = enter_symtab(name, &symtab_display[level])
"&" cannot be used in a macro parameter list. I note that this is used quite a bit in the book (the book is quite old, so the C will be outdated).
How do I get over this?
You put the complexity in when you call the macro, not when you declare it.
The macro parameters are just placeholders, to be replaced literally with the values used when you call the macro.Code:#define enter_name_local_symtab(a, b) \ idp = enter_symtab(a,b) // then later, use the macro enter_name_local_symtab(name, &symtab_display[level])
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
Have a look at: ftp://ftp.dante.de/tex-archive/support/ltx2x/l2xisymt.h where it has:
I don't particularly like that very much at all but it will at least work assuming there is a variable 'level' in scope (that's the stupid part I don't like)Code:/**************************************************************************/ /* enter_name_local_symtab() enter the given name into the local symtab */ /* and set pointer to the entry */ #define enter_name_local_symtab(idp, name) \ idp = enter_symtab(name, &symtab_display[level]) /**************************************************************************/
Thank you Salem and Hodor. I'll look at your suggestions and see how they work before I progress further.
