Add test/variant_value_construct(_cx)

test/Jamfile

@@ -23,3 +23,5 @@ run variant_default_construct.cpp : : : $(REQ) ;
 compile variant_default_construct_cx.cpp : : : $(REQ) ;
 run variant_copy_construct.cpp : : : $(REQ) ;
 run variant_move_construct.cpp : : : $(REQ) ;
+run variant_value_construct.cpp : : : $(REQ) ;
+compile variant_value_construct_cx.cpp : : : $(REQ) ;

test/variant_value_construct.cpp

@@ -0,0 +1,124 @@
+
+// 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;
+
+struct X
+{
+    operator int() const { return 2; }
+};
+
+int main()
+{
+    {
+        variant<int> v( 1 );
+
+        BOOST_TEST_EQ( v.index(), 0 );
+        BOOST_TEST_EQ( get<0>(v), 1 );
+    }
+
+    {
+        variant<int> v( 'a' );
+
+        BOOST_TEST_EQ( v.index(), 0 );
+        BOOST_TEST_EQ( get<0>(v), 'a' );
+    }
+
+    {
+        variant<int> v( X{} );
+
+        BOOST_TEST_EQ( v.index(), 0 );
+        BOOST_TEST_EQ( get<0>(v), 2 );
+    }
+
+    {
+        variant<int const> v( 1 );
+
+        BOOST_TEST_EQ( v.index(), 0 );
+        BOOST_TEST_EQ( get<0>(v), 1 );
+    }
+
+    {
+        variant<int const> v( 'a' );
+
+        BOOST_TEST_EQ( v.index(), 0 );
+        BOOST_TEST_EQ( get<0>(v), 'a' );
+    }
+
+    {
+        variant<int const> v( X{} );
+
+        BOOST_TEST_EQ( v.index(), 0 );
+        BOOST_TEST_EQ( get<0>(v), 2 );
+    }
+
+    {
+        variant<int, float, std::string> v( 1 );
+
+        BOOST_TEST_EQ( v.index(), 0 );
+        BOOST_TEST( holds_alternative<int>(v) );
+        BOOST_TEST_EQ( get<0>(v), 1 );
+    }
+
+    {
+        variant<int, float, std::string> v( 'a' );
+
+        BOOST_TEST_EQ( v.index(), 0 );
+        BOOST_TEST( holds_alternative<int>(v) );
+        BOOST_TEST_EQ( get<0>(v), 'a' );
+    }
+
+    {
+        variant<int, float, std::string> v( X{} );
+
+        BOOST_TEST_EQ( v.index(), 0 );
+        BOOST_TEST( holds_alternative<int>(v) );
+        BOOST_TEST_EQ( get<0>(v), 2 );
+    }
+
+    {
+        variant<int, float, std::string> v( 3.14f );
+
+        BOOST_TEST_EQ( v.index(), 1 );
+        BOOST_TEST( holds_alternative<float>(v) );
+        BOOST_TEST_EQ( get<1>(v), 3.14f );
+    }
+
+    {
+        variant<int, float, std::string> v( "text" );
+
+        BOOST_TEST_EQ( v.index(), 2 );
+        BOOST_TEST( holds_alternative<std::string>(v) );
+        BOOST_TEST_EQ( get<2>(v), std::string("text") );
+    }
+
+    {
+        variant<int, int, float, std::string> v( 3.14f );
+
+        BOOST_TEST_EQ( v.index(), 2 );
+        BOOST_TEST( holds_alternative<float>(v) );
+        BOOST_TEST_EQ( get<2>(v), 3.14f );
+    }
+
+    {
+        variant<int, int, float, std::string> v( "text" );
+
+        BOOST_TEST_EQ( v.index(), 3 );
+        BOOST_TEST( holds_alternative<std::string>(v) );
+        BOOST_TEST_EQ( get<3>(v), std::string("text") );
+    }
+
+    return boost::report_errors();
+}

test/variant_value_construct_cx.cpp

@@ -0,0 +1,109 @@
+
+// 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>
+
+using namespace boost::variant2;
+
+struct X
+{
+    constexpr operator int() const { return 2; }
+};
+
+#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
+
+int main()
+{
+    {
+        constexpr variant<int> v( 1 );
+
+        STATIC_ASSERT( v.index() == 0 );
+        STATIC_ASSERT( get<0>(v) == 1 );
+    }
+
+    {
+        constexpr variant<int> v( 'a' );
+
+        STATIC_ASSERT( v.index() == 0 );
+        STATIC_ASSERT( get<0>(v) == 'a' );
+    }
+
+    {
+        constexpr variant<int> v( X{} );
+
+        STATIC_ASSERT( v.index() == 0 );
+        STATIC_ASSERT( get<0>(v) == 2 );
+    }
+
+    {
+        constexpr variant<int const> v( 1 );
+
+        STATIC_ASSERT( v.index() == 0 );
+        STATIC_ASSERT( get<0>(v) == 1 );
+    }
+
+    {
+        constexpr variant<int const> v( 'a' );
+
+        STATIC_ASSERT( v.index() == 0 );
+        STATIC_ASSERT( get<0>(v) == 'a' );
+    }
+
+    {
+        constexpr variant<int const> v( X{} );
+
+        STATIC_ASSERT( v.index() == 0 );
+        STATIC_ASSERT( get<0>(v) == 2 );
+    }
+
+    {
+        constexpr variant<int, float, X> v( 1 );
+
+        STATIC_ASSERT( v.index() == 0 );
+        STATIC_ASSERT( holds_alternative<int>(v) );
+        STATIC_ASSERT( get<0>(v) == 1 );
+    }
+
+    {
+        constexpr variant<int, float, X> v( 'a' );
+
+        STATIC_ASSERT( v.index() == 0 );
+        STATIC_ASSERT( holds_alternative<int>(v) );
+        STATIC_ASSERT( get<0>(v) == 'a' );
+    }
+
+    {
+        constexpr variant<int, float, X> v( 3.14f );
+
+        STATIC_ASSERT( v.index() == 1 );
+        STATIC_ASSERT( holds_alternative<float>(v) );
+        STATIC_ASSERT( get<1>(v) == 3.14f );
+    }
+
+    {
+        constexpr variant<int, float, X> v( X{} );
+
+        STATIC_ASSERT( v.index() == 2 );
+        STATIC_ASSERT( holds_alternative<X>(v) );
+    }
+
+    {
+        constexpr variant<int, int, float, X> v( 3.14f );
+
+        STATIC_ASSERT( v.index() == 2 );
+        STATIC_ASSERT( holds_alternative<float>(v) );
+        STATIC_ASSERT( get<2>(v) == 3.14f );
+    }
+
+    {
+        constexpr variant<int, int, float, X> v( X{} );
+
+        STATIC_ASSERT( v.index() == 3 );
+        STATIC_ASSERT( holds_alternative<X>(v) );
+    }
+}