73 lines
1.8 KiB
C++
73 lines
1.8 KiB
C++
// noncopyable.cpp
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///
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// (C) Copyright Eric Niebler 2004.
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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/*
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Revision history:
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21 December 2005 : Initial version.
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*/
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#include <vector>
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#include <boost/foreach.hpp>
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#include <boost/noncopyable.hpp>
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#include <boost/range/iterator_range.hpp>
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struct noncopy_vector
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: std::vector<int>
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, private boost::noncopyable
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{
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noncopy_vector() { }
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};
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struct noncopy_range
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: boost::iterator_range<noncopy_vector::iterator>
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, private boost::noncopyable
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{
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noncopy_range() { }
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};
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// Tell FOREACH that noncopy_vector and noncopy_range are non-copyable.
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// NOTE: this is only necessary if
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// a) your type does not inherit from boost::noncopyable, OR
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// b) Boost.Config defines BOOST_BROKEN_IS_BASE_AND_DERIVED for your compiler
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#ifdef BOOST_BROKEN_IS_BASE_AND_DERIVED
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inline boost::mpl::true_ *boost_foreach_is_noncopyable(noncopy_vector *&, boost::foreach::tag)
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{
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return 0;
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}
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inline boost::mpl::true_ *boost_foreach_is_noncopyable(noncopy_range *&, boost::foreach::tag)
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{
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return 0;
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}
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#endif
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// tell FOREACH that noncopy_range is a lightweight proxy object
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inline boost::mpl::true_ *boost_foreach_is_lightweight_proxy(noncopy_range *&, boost::foreach::tag)
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{
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return 0;
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}
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///////////////////////////////////////////////////////////////////////////////
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// main
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//
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int main( int, char*[] )
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{
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noncopy_vector v1;
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BOOST_FOREACH( int & i, v1 ) { (void)i; }
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noncopy_vector const v2;
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BOOST_FOREACH( int const & j, v2 ) { (void)j; }
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noncopy_range rng1;
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BOOST_FOREACH( int & k, rng1 ) { (void)k; }
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noncopy_range const rng2;
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BOOST_FOREACH( int & l, rng2 ) { (void)l; }
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return 0;
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}
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