121 lines
2.3 KiB
C++
121 lines
2.3 KiB
C++
/*=============================================================================
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Copyright (c) 2012 Joel de Guzman
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#include <boost/config.hpp>
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#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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#error "Valid only on compilers that support rvalues"
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#endif
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#include <boost/detail/lightweight_test.hpp>
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#include <boost/static_assert.hpp>
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#include <boost/assert.hpp>
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#include <vector>
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namespace test_detail
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{
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int copies = 0;
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void incr_copy()
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{
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copies++;
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}
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struct x
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{
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int i;
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x() : i(123) {}
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x(x&& rhs) : i(rhs.i) {}
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x& operator=(x&& rhs)
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{
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i = rhs.i;
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return *this;
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}
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x(x const& /*rhs*/)
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{
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incr_copy();
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}
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x& operator=(x const& /*rhs*/)
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{
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incr_copy();
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return *this;
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}
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};
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typedef std::vector<x> vector_type;
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extern bool disable_rvo; // to disable RVO
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vector_type
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generate_vec()
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{
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vector_type v;
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v.push_back(x());
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if (disable_rvo)
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return v;
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return vector_type();
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}
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template <typename T>
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T move_me(T && val)
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{
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T r(std::move(val));
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if (disable_rvo)
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return r;
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return T();
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}
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typedef FUSION_SEQUENCE return_type;
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return_type
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generate()
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{
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return_type r(generate_vec());
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if (disable_rvo)
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return r;
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return return_type();
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}
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typedef FUSION_SEQUENCE2 return_type2;
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return_type2
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generate2()
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{
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return_type2 r(generate_vec(), x());
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if (disable_rvo)
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return r;
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return return_type2();
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}
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}
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void test()
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{
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using namespace boost::fusion;
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using namespace test_detail;
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return_type v = move_me(generate());
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BOOST_TEST(copies == 0);
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return_type2 v2 = move_me(generate2());
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BOOST_TEST(copies == 0);
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v2 = move_me(generate2());
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BOOST_TEST(copies == 0);
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std::cout << "Copies: " << copies << std::endl;
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}
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namespace test_detail
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{
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bool disable_rvo = true;
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}
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