ceph/src/boost/libs/static_assert/static_assert_test_fail_8.cpp

   1 //  (C) Copyright John Maddock 2000.
   2 //  Use, modification and distribution are subject to the
   3 //  Boost Software License, Version 1.0. (See accompanying file
   4 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   5
   6 //  See http://www.boost.org for most recent version including documentation.
   7
   8 #include <iterator>
   9 #include <list>
  10 #include <deque>
  11 #include <boost/static_assert.hpp>
  12 #include <boost/type_traits.hpp>
  13
  14 template <class RandomAccessIterator >
  15 RandomAccessIterator foo(RandomAccessIterator from, RandomAccessIterator)
  16 {
  17    // this template can only be used with
  18    // random access iterators...
  19    typedef typename std::iterator_traits< RandomAccessIterator >::iterator_category cat;
  20    BOOST_STATIC_ASSERT((boost::is_convertible<cat*, std::random_access_iterator_tag*>::value));
  21    //
  22    // detail goes here...
  23    return from;
  24 }
  25
  26 // ensure that delayed instantiation compilers like Comeau see the failure early
  27 // enough for "compile-fail" testing with the Boost.Build testing framework. (Greg Comeau)
  28 template
  29 std::list<int>::iterator
  30    foo(std::list<int>::iterator, std::list<int>::iterator);
  31
  32 int main()
  33 {
  34    std::deque<int> d;
  35    std::list<int> l;
  36    foo(d.begin(), d.end()); // OK
  37    foo(l.begin(), l.end()); // error
  38    return 0;
  39 }
  40
  41
  42
  43
  44