// (C) Copyright John Maddock 2000. // Use, modification and distribution are subject to the // Boost Software License, Version 1.0. (See accompanying file // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) // See http://www.boost.org for most recent version including documentation. #include <iterator> #include <list> #include <deque> #include <boost/static_assert.hpp> #include <boost/type_traits.hpp> template <class RandomAccessIterator > RandomAccessIterator foo(RandomAccessIterator from, RandomAccessIterator /*to*/) { // this template can only be used with // random access iterators... typedef typename std::iterator_traits< RandomAccessIterator >::iterator_category cat; BOOST_STATIC_ASSERT((boost::is_convertible<cat, const std::random_access_iterator_tag&>::value)); // // detail goes here... return from; } int main() { std::deque<int> d; std::list<int> l; foo(d.begin(), d.end()); // OK //foo(l.begin(), l.end()); // error return 0; }