Rob Stewart <stewart@sig.com> writes:
I uploaded some fixes to multivalues.zip:
- Workaround for BCB's lack of EBO
- Fixed some overzealous searches/replaces
- Eliminated SFINAE from test program
- Moved some tests out of the macros to assist in debugging, should anyone have problems with support in a particular compiler.
Some questions:
- What operator(s) should we use to delimit user-defined predicates? Here are some interesting candidates:
if (any_of(...) << some_predicate() >> 5)... // 1
if (any_of(...) < some_predicate() > 5)... // 2
if (any_of(...) ^ some_predicate() ^ 5)... // 3
if (any_of(...) / some_predicate() / 5)... // 4
1 seems pretty good because the two-character operators stand out well. 2 works pretty well, but I'm concerned that the operators may get lost if the predicate is a specialization of a template type; the template argument list uses the same tokens. (1 is better in that case because of the doubled tokens.)
None of them look right to me. Unless you close up the spaces next to some_predicate(), they appear to be doing what the usual C++ operators do. a < b looks like less-than; a <b immediately starts to suggest something else. -- Dave Abrahams Boost Consulting www.boost-consulting.com