Mathias Gaunard wrote:
Chris Purcell wrote:
As documented in the manual ("Pitfalls"), BOOST_FOREACH is a little awkward to use with associative containers. [...]
There are a few alternatives to my solution that I have seen: [...]
Alternatives you didn't mention:
1) Use TheContainer::value_type instead of std::pair<foo, bar>.
Problem is that TheContainer usually contains commas (e.g. std::map<..,..> ) so you are again looking at a typedef.
2) Use type deduction to avoid having to provide the type of the elements altogether using auto or BOOST_AUTO.
Can BOOST_AUTO be used with BOOST_FOREACH? From memory I thought it couldn't...
I think your BOOST_FOREACH_PAIR is interesting, but maybe it could be generalized to tuples?
It could. Pitfalls to avoid if possible are - ugly syntax of one macro per arity - parenthesis soup so common to PP-programming. I think maybe BOOST_FOREACH_TUPLE( (Arg1T)(arg1) .... (ArgNT)(argn) , range ) could be made to work.