| // noncopyable.cpp |
| /// |
| // (C) Copyright Eric Niebler 2004. |
| // 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) |
| |
| /* |
| Revision history: |
| 21 December 2005 : Initial version. |
| */ |
| |
| #include <vector> |
| #include <boost/foreach.hpp> |
| #include <boost/noncopyable.hpp> |
| #include <boost/range/iterator_range.hpp> |
| |
| struct noncopy_vector |
| : std::vector<int> |
| , private boost::noncopyable |
| { |
| noncopy_vector() { } |
| }; |
| |
| struct noncopy_range |
| : boost::iterator_range<noncopy_vector::iterator> |
| , private boost::noncopyable |
| { |
| noncopy_range() { } |
| }; |
| |
| // Tell FOREACH that noncopy_vector and noncopy_range are non-copyable. |
| // NOTE: this is only necessary if |
| // a) your type does not inherit from boost::noncopyable, OR |
| // b) Boost.Config defines BOOST_BROKEN_IS_BASE_AND_DERIVED for your compiler |
| #ifdef BOOST_BROKEN_IS_BASE_AND_DERIVED |
| inline boost::mpl::true_ *boost_foreach_is_noncopyable(noncopy_vector *&, boost::foreach::tag) |
| { |
| return 0; |
| } |
| |
| inline boost::mpl::true_ *boost_foreach_is_noncopyable(noncopy_range *&, boost::foreach::tag) |
| { |
| return 0; |
| } |
| #endif |
| |
| // tell FOREACH that noncopy_range is a lightweight proxy object |
| inline boost::mpl::true_ *boost_foreach_is_lightweight_proxy(noncopy_range *&, boost::foreach::tag) |
| { |
| return 0; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // main |
| // |
| int main( int, char*[] ) |
| { |
| noncopy_vector v1; |
| BOOST_FOREACH( int & i, v1 ) { (void)i; } |
| |
| noncopy_vector const v2; |
| BOOST_FOREACH( int const & j, v2 ) { (void)j; } |
| |
| noncopy_range rng1; |
| BOOST_FOREACH( int & k, rng1 ) { (void)k; } |
| |
| noncopy_range const rng2; |
| BOOST_FOREACH( int & l, rng2 ) { (void)l; } |
| |
| return 0; |
| } |