65 lines
1.3 KiB
C++
65 lines
1.3 KiB
C++
//
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// Test that ref(ref(x)) does NOT collapse to ref(x)
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//
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// This irregularity of std::ref is questionable and breaks
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// existing Boost code such as proto::make_expr
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//
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// Copyright 2014 Peter Dimov
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//
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// Distributed under the Boost Software License, Version 1.0.
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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//
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#include <boost/ref.hpp>
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#include <boost/core/lightweight_test.hpp>
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template<class T> void test( T const & t )
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{
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{
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boost::reference_wrapper< T const > r = boost::ref( t );
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BOOST_TEST_EQ( &r.get(), &t );
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}
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{
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boost::reference_wrapper< T const > r = boost::cref( t );
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BOOST_TEST_EQ( &r.get(), &t );
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}
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}
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template<class T> void test_nonconst( T & t )
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{
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{
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boost::reference_wrapper< T > r = boost::ref( t );
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BOOST_TEST_EQ( &r.get(), &t );
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}
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{
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boost::reference_wrapper< T const > r = boost::cref( t );
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BOOST_TEST_EQ( &r.get(), &t );
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}
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}
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int main()
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{
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int x = 0;
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test( x );
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test( boost::ref( x ) );
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test( boost::cref( x ) );
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test_nonconst( x );
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{
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boost::reference_wrapper< int > r = boost::ref( x );
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test_nonconst( r );
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}
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{
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boost::reference_wrapper< int const > r = boost::cref( x );
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test_nonconst( r );
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}
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return boost::report_errors();
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}
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