http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51989
Bug #: 51989 Summary: std::deque::iterator recognised as container Classification: Unclassified Product: gcc Version: 4.7.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassig...@gcc.gnu.org ReportedBy: leo...@volnitsky.com Created attachment 26450 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26450 deque-bug.cc I need is_container<T> template which would recognize if T is a container. Code below works as expected. With exception for std::deque::iterator - gcc can not compile code below: ------------------------------------------------------------------ #include <iostream> #include <type_traits> #include <vector> #include <list> #include <set> #include <deque> template <typename T> struct is_container { template <typename U> static char test( U* u, typename U::const_iterator b = ((U*)0)->begin(), typename U::const_iterator e = ((U*)0)->end() ); template <typename U> static long test(...); enum { value = sizeof test<T>(0) == 1 }; }; int main() { std::cout << "void\t" << is_container< void >::value << '\n'; std::cout << "int\t" << is_container< int >::value << '\n'; std::cout << "int*\t" << is_container< int* >::value << '\n'; std::cout << "vector<int>\t" << is_container< std::vector<int> >::value << '\n'; std::cout << "deque<int>\t" << is_container< std::deque<int> >::value << '\n'; std::cout << "set<int>::iterator\t" << is_container< std::set<int>::iterator >::value << '\n'; std::cout << "vector<int>::iterator\t" << is_container< std::vector<int>::iterator >::value << '\n'; // gcc error std::cout << "deque<int>::iterator\t" << is_container< std::deque<int>::iterator >::value << '\n'; } ----------------------------------------------------------------------- Compiling it with GCC (4.7.0-alpha20111203): gcc -std=gnu++0x -Wall deque-bug.cc -o deque-bug Produce following error: deque-bug.cc: In instantiation of ‘struct is_container<std::_Deque_iterator<int, int&, int*> >’: deque-bug.cc:31:84: required from here deque-bug.cc:18:7: error: ‘struct std::_Deque_iterator<int, int&, int*>’ has no member named ‘begin’ deque-bug.cc:18:7: error: ‘struct std::_Deque_iterator<int, int&, int*>’ has no member named ‘end’ Attached are source and -save-temps