Add test/variant_copy_assign, variant_move_assign

test/variant_move_assign.cpp

@@ -0,0 +1,168 @@
+
+// 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 );
+
+        variant<int> v2( 1 );
+
+        v = std::move(v2);
+        BOOST_TEST_EQ( get<0>(v), 1 );
+
+        variant<int> v3( 2 );
+
+        v = std::move(v3);
+        BOOST_TEST_EQ( get<0>(v), 2 );
+    }
+
+    {
+        variant<int, float> v;
+        BOOST_TEST_EQ( v.index(), 0 );
+        BOOST_TEST_EQ( get<0>(v), 0 );
+
+        variant<int, float> v2( 1 );
+
+        v = std::move(v2);
+        BOOST_TEST_EQ( v.index(), 0 );
+        BOOST_TEST_EQ( get<0>(v), 1 );
+
+        variant<int, float> v3( 3.14f );
+
+        v = std::move(v3);
+        BOOST_TEST_EQ( v.index(), 1 );
+        BOOST_TEST_EQ( get<1>(v), 3.14f );
+
+        variant<int, float> v4( 3.15f );
+
+        v = std::move(v4);
+        BOOST_TEST_EQ( v.index(), 1 );
+        BOOST_TEST_EQ( get<1>(v), 3.15f );
+    }
+
+    {
+        variant<int, int, float, std::string> v;
+        BOOST_TEST_EQ( v.index(), 0 );
+        BOOST_TEST_EQ( get<0>(v), 0 );
+
+        variant<int, int, float, std::string> v2( in_place_index<1>, 1 );
+
+        v = std::move(v2);
+        BOOST_TEST_EQ( v.index(), 1 );
+        BOOST_TEST_EQ( get<1>(v), 1 );
+
+        variant<int, int, float, std::string> v3( 3.14f );
+
+        v = std::move(v3);
+        BOOST_TEST_EQ( v.index(), 2 );
+        BOOST_TEST_EQ( get<2>(v), 3.14f );
+
+        variant<int, int, float, std::string> v4( 3.15f );
+
+        v = std::move(v4);
+        BOOST_TEST_EQ( v.index(), 2 );
+        BOOST_TEST_EQ( get<2>(v), 3.15f );
+
+        variant<int, int, float, std::string> v5( "s1" );
+
+        v = std::move(v5);
+        BOOST_TEST_EQ( v.index(), 3 );
+        BOOST_TEST_EQ( get<3>(v), std::string("s1") );
+
+        variant<int, int, float, std::string> v6( "s2" );
+
+        v = std::move(v6);
+        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 );
+
+        variant<X1, X2> v2( X1{1} );
+
+        v = std::move(v2);
+        BOOST_TEST_EQ( v.index(), 0 );
+        BOOST_TEST_EQ( get<0>(v).v, 1 );
+
+        variant<X1, X2> v3( in_place_index<1>, 2 );
+
+        v = std::move(v3);
+        BOOST_TEST_EQ( v.index(), 1 );
+        BOOST_TEST_EQ( get<1>(v).v, 2 );
+
+        variant<X1, X2> v4( in_place_index<1>, 3 );
+
+        v = std::move(v4);
+        BOOST_TEST_EQ( v.index(), 1 );
+        BOOST_TEST_EQ( get<1>(v).v, 3 );
+
+        variant<X1, X2> v5( in_place_index<0>, 4 );
+
+        v = std::move(v5);
+        BOOST_TEST_EQ( v.index(), 0 );
+        BOOST_TEST_EQ( get<0>(v).v, 4 );
+    }
+
+    return boost::report_errors();
+}