[boost] Re: Ideas for logging/tracing

From: Daniel James (daniel_at_[hidden])
Date: 2004-11-13 18:57:57

Paul Mensonides wrote:
>>1. Use of PP_SEQ interface to "parse" function name and arguments
>>
>>    int X::foo(char* buf, size_t len)
>>    {
>>        BOOST_TRACE_MEM_FUN( (foo)(buf, len) );
> 
>                                      ^^^^^^^^
> 
> You can't do this without variadic macros (ala C99).  We should have these in
> C++ eventually, but we don't right now and the pp-lib doesn't support them.

I think he's just using BOOST_PP_SEQ_TAIL to get the arguments. This 
means that they're never directly accessed by the sequence macros. For 
example:

     #define ARGUMENT_STRING(fn)
         BOOST_PP_STRINGIZE(BOOST_PP_SEQ_TAIL(fn))

     ARGUMENT_STRING((foo)(buf, len)) // Expands to "(buf, len)"

That works on g++, although I don't know how portable it is.

Daniel