Philippe Vaucher wrote:
FWIW, another interface could be a class like :
// untested class scope_guard ...
See also <boost/multi_index/detail/scope_guard.hpp>.
This, used along with boost::bind would make your example become smth like :
glob_t result_glob; scope_guard guard(boost::bind(&globfree, &result_glob)); /* throw or return here */
Try to construct a guard for more complex case: void foo(std::map<char,int>& codes, char symbol, int code) { bool cancel = codes.insert(std::make_pair(symbol, code)).second; { BOOST_SCOPE_EXIT( (cancel)(codes)(symbol) ) { if(cancel) codes.erase(symbol); }} _; // ... cancel = false; // All is fine at this point, commit. } Problem 1: if. You should use boost::lambda. Problem 2: overloaded erase. I don't think that many developers will wrap erase. They need straitforward solution that doesn't require opening lambda docs, looking for _1->* or bind constructs, trying to figure out why _1->* &std::map<char,int>::erase doesn't work and so on. Problem 3: you can set breakpoint at codes.erase(symbol) line but how do you set it in scope_guard (conditional breakpoint in ~scope_guard with this == &guard stops even if cancel == false)? -- Alexander Nasonov http://nasonov.blogspot.com Float like a butterfly, sting like a bee. Muhammad Ali This quote is generated by: /usr/pkg/bin/curl -L http://tinyurl.com/veusy \ | sed -e 's/^document\.write(.//' -e 's/.);$//' \ -e 's/<[^>]*>//g' -e 's/^More quotes from //' \ | fmt | tee ~/.signature-quote