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- // Copyright 2017 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/variant2/variant.hpp>
- #include <boost/core/lightweight_test.hpp>
- #include <boost/core/lightweight_test_trait.hpp>
- #include <type_traits>
- #include <utility>
- #include <string>
- using namespace boost::variant2;
- #define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
- struct X1
- {
- int v;
- X1(): v(0) {}
- explicit X1(int v): v(v) {}
- X1(X1 const& r): v(r.v) {}
- X1(X1&& r): v(r.v) {}
- X1& operator=( X1 const& r ) { v = r.v; return *this; }
- X1& operator=( X1&& r ) { v = r.v; return *this; }
- };
- inline bool operator==( X1 const& a, X1 const& b ) { return a.v == b.v; }
- STATIC_ASSERT( !std::is_nothrow_default_constructible<X1>::value );
- STATIC_ASSERT( !std::is_nothrow_copy_constructible<X1>::value );
- STATIC_ASSERT( !std::is_nothrow_move_constructible<X1>::value );
- STATIC_ASSERT( !std::is_nothrow_copy_assignable<X1>::value );
- STATIC_ASSERT( !std::is_nothrow_move_assignable<X1>::value );
- struct X2
- {
- int v;
- X2(): v(0) {}
- explicit X2(int v): v(v) {}
- X2(X2 const& r): v(r.v) {}
- X2(X2&& r): v(r.v) {}
- X2& operator=( X2 const& r ) { v = r.v; return *this; }
- X2& operator=( X2&& r ) { v = r.v; return *this; }
- };
- inline bool operator==( X2 const& a, X2 const& b ) { return a.v == b.v; }
- STATIC_ASSERT( !std::is_nothrow_default_constructible<X2>::value );
- STATIC_ASSERT( !std::is_nothrow_copy_constructible<X2>::value );
- STATIC_ASSERT( !std::is_nothrow_move_constructible<X2>::value );
- STATIC_ASSERT( !std::is_nothrow_copy_assignable<X2>::value );
- STATIC_ASSERT( !std::is_nothrow_move_assignable<X2>::value );
- int main()
- {
- {
- variant<int> v;
- BOOST_TEST_EQ( get<0>(v), 0 );
- v = 1;
- BOOST_TEST_EQ( get<0>(v), 1 );
- v = 2;
- BOOST_TEST_EQ( get<0>(v), 2 );
- int w1 = 3;
- v = w1;
- BOOST_TEST_EQ( get<0>(v), 3 );
- int const w2 = 4;
- v = w2;
- BOOST_TEST_EQ( get<0>(v), 4 );
- v = std::move( w1 );
- BOOST_TEST_EQ( get<0>(v), 3 );
- v = std::move( w2 );
- BOOST_TEST_EQ( get<0>(v), 4 );
- }
- {
- variant<int, float> v;
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v), 0 );
- v = 1;
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v), 1 );
- v = 3.14f;
- BOOST_TEST_EQ( v.index(), 1 );
- BOOST_TEST_EQ( get<1>(v), 3.14f );
- float w1 = 3.15f;
- v = w1;
- BOOST_TEST_EQ( v.index(), 1 );
- BOOST_TEST_EQ( get<1>(v), 3.15f );
- int const w2 = 2;
- v = w2;
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v), 2 );
- v = std::move(w1);
- BOOST_TEST_EQ( v.index(), 1 );
- BOOST_TEST_EQ( get<1>(v), 3.15f );
- v = std::move(w2);
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v), 2 );
- }
- {
- variant<int, int, float, std::string> v;
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v), 0 );
- v = 3.14f;
- BOOST_TEST_EQ( v.index(), 2 );
- BOOST_TEST_EQ( get<2>(v), 3.14f );
- float const w1 = 3.15f;
- v = w1;
- BOOST_TEST_EQ( v.index(), 2 );
- BOOST_TEST_EQ( get<2>(v), 3.15f );
- variant<int, int, float, std::string> v5( "s1" );
- v = "s1";
- BOOST_TEST_EQ( v.index(), 3 );
- BOOST_TEST_EQ( get<3>(v), std::string("s1") );
- std::string w2( "s2" );
- v = w2;
- BOOST_TEST_EQ( v.index(), 3 );
- BOOST_TEST_EQ( get<3>(v), std::string("s2") );
- v = std::move(w1);
- BOOST_TEST_EQ( v.index(), 2 );
- BOOST_TEST_EQ( get<2>(v), 3.15f );
- v = std::move(w2);
- BOOST_TEST_EQ( v.index(), 3 );
- BOOST_TEST_EQ( get<3>(v), std::string("s2") );
- }
- {
- variant<X1, X2> v;
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v).v, 0 );
- v = X1{1};
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v).v, 1 );
- v = X2{2};
- BOOST_TEST_EQ( v.index(), 1 );
- BOOST_TEST_EQ( get<1>(v).v, 2 );
- X1 w1{3};
- v = w1;
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v).v, 3 );
- X1 const w2{4};
- v = w2;
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v).v, 4 );
- X2 w3{5};
- v = w3;
- BOOST_TEST_EQ( v.index(), 1 );
- BOOST_TEST_EQ( get<1>(v).v, 5 );
- X2 const w4{6};
- v = w4;
- BOOST_TEST_EQ( v.index(), 1 );
- BOOST_TEST_EQ( get<1>(v).v, 6 );
- v = std::move(w1);
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v).v, 3 );
- v = std::move(w2);
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v).v, 4 );
- }
- return boost::report_errors();
- }
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