Geoffrey Irving <irving@cs.stanford.edu> writes:
Hello,
I would like to be able to write code like this:
int i; for F in LIST_OF_TYPES complicated_function<F>(i);
where this code is inside some other function which is inside a class templatized over LIST_OF_TYPES. Given the lack of nested functions and classes in C++ functions, am I correct in thinking that it's impossible to do this sort of thing inside another function?
Okay, what's wrong with boost::mpl::for_each? Argh, no wonder! Why isn't that in the reference manual? I'm afraid you'll have to read http://www.boost-consulting.com/mplbook for documentaiton on for_each :( This general approach should work: // Just in case T can't be constructed and passed by value template <class T> struct wrap {}; struct call_complicated { // You could also use boost::bind for this call_complicated(int i) : i(i) {} int i; template <class T> void operator()(wrap<T>) const { complicated_function<T>(i); } }; template <class list_of_types> class foo { void some_function() { int i; mpl::for_each<list_of_types, wrap<mpl::_1> >( call_complicated(i) ); } }; HTH, -- Dave Abrahams Boost Consulting www.boost-consulting.com