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- //
- // Test that ref(ref(x)) does NOT collapse to ref(x)
- //
- // This irregularity of std::ref is questionable and breaks
- // existing Boost code such as proto::make_expr
- //
- // Copyright 2014 Peter Dimov
- //
- // Distributed under 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
- //
- #include <boost/ref.hpp>
- #include <boost/core/lightweight_test.hpp>
- template<class T> void test( T const & t )
- {
- {
- boost::reference_wrapper< T const > r = boost::ref( t );
- BOOST_TEST_EQ( &r.get(), &t );
- }
- {
- boost::reference_wrapper< T const > r = boost::cref( t );
- BOOST_TEST_EQ( &r.get(), &t );
- }
- }
- template<class T> void test_nonconst( T & t )
- {
- {
- boost::reference_wrapper< T > r = boost::ref( t );
- BOOST_TEST_EQ( &r.get(), &t );
- }
- {
- boost::reference_wrapper< T const > r = boost::cref( t );
- BOOST_TEST_EQ( &r.get(), &t );
- }
- }
- int main()
- {
- int x = 0;
- test( x );
- test( boost::ref( x ) );
- test( boost::cref( x ) );
- test_nonconst( x );
- {
- boost::reference_wrapper< int > r = boost::ref( x );
- test_nonconst( r );
- }
- {
- boost::reference_wrapper< int const > r = boost::cref( x );
- test_nonconst( r );
- }
- return boost::report_errors();
- }
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