-----Original Message----- From: boost-bounces@lists.boost.org [mailto:boost-bounces@lists.boost.org] On Behalf Of Alexander Nasonov
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 thought I can't but BOOST_PP_POP_FRONT( (foo)(buf, len) ) works on gcc and sunpro!
That might work because there is no need to ever touch (buf, len). That is not guaranteed, however.
BOOST_PP_ELEM(1, (foo)(buf, len) ) of course doesn't work but BOOST_PP_ELEM(0, (foo)(buf, len) ) do.
Again, this happens to work because the implementation doesn't happen to touch (buf, len) at all. Once again, this is not guaranteed to work. More generally, without both variadic macros and a sequence implementation designed to handle arbitrary-arity elements, (foo)(buf, len) is not a sequence. There are, of course, alternatives, such as (foo)((buf)(len)). Regards, Paul Mensonides