forked from boostorg/core
116 lines
3.4 KiB
C++
116 lines
3.4 KiB
C++
// compile-time test for "boost/ref.hpp" header content
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// see 'ref_test.cpp' for run-time part
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#include <boost/ref.hpp>
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#include <boost/type_traits/same_traits.hpp>
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#include <boost/static_assert.hpp>
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namespace {
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template< typename T, typename U >
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void ref_test(boost::reference_wrapper<U>)
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{
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typedef typename boost::reference_wrapper<U>::type type;
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BOOST_STATIC_ASSERT((boost::is_same<U,type>::value));
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BOOST_STATIC_ASSERT((boost::is_same<T,type>::value));
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}
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template< typename T >
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void assignable_test(T x)
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{
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x = x;
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}
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template< bool R, typename T >
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void is_reference_wrapper_test(T)
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{
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BOOST_STATIC_ASSERT(boost::is_reference_wrapper<T>::value == R);
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}
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template< typename R, typename Ref >
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void cxx_reference_test(Ref)
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{
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BOOST_STATIC_ASSERT((boost::is_same<R,Ref>::value));
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}
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template< typename R, typename Ref >
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void unwrap_reference_test(Ref)
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{
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typedef typename boost::unwrap_reference<Ref>::type type;
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BOOST_STATIC_ASSERT((boost::is_same<R,type>::value));
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}
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} // namespace
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int main()
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{
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int i = 0;
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int& ri = i;
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int const ci = 0;
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int const& rci = ci;
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// 'ref/cref' functions test
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ref_test<int>(boost::ref(i));
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ref_test<int>(boost::ref(ri));
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ref_test<int const>(boost::ref(ci));
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ref_test<int const>(boost::ref(rci));
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ref_test<int const>(boost::cref(i));
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ref_test<int const>(boost::cref(ri));
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ref_test<int const>(boost::cref(ci));
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ref_test<int const>(boost::cref(rci));
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// test 'assignable' requirement
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assignable_test(boost::ref(i));
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assignable_test(boost::ref(ri));
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assignable_test(boost::cref(i));
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assignable_test(boost::cref(ci));
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assignable_test(boost::cref(rci));
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// 'is_reference_wrapper' test
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is_reference_wrapper_test<true>(boost::ref(i));
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is_reference_wrapper_test<true>(boost::ref(ri));
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is_reference_wrapper_test<true>(boost::cref(i));
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is_reference_wrapper_test<true>(boost::cref(ci));
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is_reference_wrapper_test<true>(boost::cref(rci));
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is_reference_wrapper_test<false>(i);
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is_reference_wrapper_test<false, int&>(ri);
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is_reference_wrapper_test<false>(ci);
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is_reference_wrapper_test<false, int const&>(rci);
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// ordinary references/function template arguments deduction test
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cxx_reference_test<int>(i);
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cxx_reference_test<int>(ri);
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cxx_reference_test<int>(ci);
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cxx_reference_test<int>(rci);
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cxx_reference_test<int&, int&>(i);
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cxx_reference_test<int&, int&>(ri);
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cxx_reference_test<int const&, int const&>(i);
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cxx_reference_test<int const&, int const&>(ri);
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cxx_reference_test<int const&, int const&>(ci);
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cxx_reference_test<int const&, int const&>(rci);
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// 'unwrap_reference' test
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unwrap_reference_test<int>(boost::ref(i));
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unwrap_reference_test<int>(boost::ref(ri));
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unwrap_reference_test<int const>(boost::cref(i));
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unwrap_reference_test<int const>(boost::cref(ci));
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unwrap_reference_test<int const>(boost::cref(rci));
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unwrap_reference_test<int>(i);
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unwrap_reference_test<int>(ri);
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unwrap_reference_test<int>(ci);
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unwrap_reference_test<int>(rci);
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unwrap_reference_test<int&, int&>(i);
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unwrap_reference_test<int&, int&>(ri);
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unwrap_reference_test<int const&, int const&>(i);
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unwrap_reference_test<int const&, int const&>(ri);
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unwrap_reference_test<int const&, int const&>(ci);
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unwrap_reference_test<int const&, int const&>(rci);
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return 0;
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}
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