Add test/variant_in_place_type_construct(_cx)

test/Jamfile

@@ -27,3 +27,5 @@ run variant_value_construct.cpp : : : $(REQ) ;
 compile variant_value_construct_cx.cpp : : : $(REQ) ;
 run variant_in_place_index_construct.cpp : : : $(REQ) ;
 compile variant_in_place_index_construct_cx.cpp : : : $(REQ) ;
+run variant_in_place_type_construct.cpp : : : $(REQ) ;
+compile variant_in_place_type_construct_cx.cpp : : : $(REQ) ;

test/variant_in_place_type_construct.cpp

@@ -0,0 +1,116 @@
+
+// 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
+{
+    X() = default;
+    template<class T> X( in_place_type_t<T> ) = delete;
+};
+
+int main()
+{
+    {
+        variant<int> v( in_place_type<int> );
+
+        BOOST_TEST_EQ( v.index(), 0 );
+        BOOST_TEST_EQ( get<0>(v), 0 );
+
+        BOOST_TEST( holds_alternative<int>(v) );
+    }
+
+    {
+        variant<X> v( in_place_type<X> );
+
+        BOOST_TEST_EQ( v.index(), 0 );
+
+        BOOST_TEST( holds_alternative<X>(v) );
+    }
+
+    {
+        variant<int> v( in_place_type<int>, 1 );
+
+        BOOST_TEST_EQ( v.index(), 0 );
+        BOOST_TEST_EQ( get<0>(v), 1 );
+
+        BOOST_TEST( holds_alternative<int>(v) );
+    }
+
+    {
+        variant<int, float> v( in_place_type<int> );
+
+        BOOST_TEST_EQ( v.index(), 0 );
+        BOOST_TEST_EQ( get<0>(v), 0 );
+
+        BOOST_TEST( holds_alternative<int>(v) );
+    }
+
+    {
+        variant<int, float> v( in_place_type<int>, 1 );
+
+        BOOST_TEST_EQ( v.index(), 0 );
+        BOOST_TEST_EQ( get<0>(v), 1 );
+
+        BOOST_TEST( holds_alternative<int>(v) );
+    }
+
+    {
+        variant<int, float> v( in_place_type<float> );
+
+        BOOST_TEST_EQ( v.index(), 1 );
+        BOOST_TEST_EQ( get<1>(v), 0 );
+
+        BOOST_TEST( holds_alternative<float>(v) );
+    }
+
+    {
+        variant<int, float> v( in_place_type<float>, 3.14f );
+
+        BOOST_TEST_EQ( v.index(), 1 );
+        BOOST_TEST_EQ( get<1>(v), 3.14f );
+
+        BOOST_TEST( holds_alternative<float>(v) );
+    }
+
+    {
+        variant<int, int, float, std::string> v( in_place_type<float>, 3.14f );
+
+        BOOST_TEST_EQ( v.index(), 2 );
+        BOOST_TEST_EQ( get<2>(v), 3.14f );
+
+        BOOST_TEST( holds_alternative<float>(v) );
+    }
+
+    {
+        variant<int, int, float, float, std::string> v( in_place_type<std::string>, "text" );
+
+        BOOST_TEST_EQ( v.index(), 4 );
+        BOOST_TEST_EQ( get<4>(v), std::string("text") );
+
+        BOOST_TEST( holds_alternative<std::string>(v) );
+    }
+
+    {
+        variant<int, int, float, float, std::string> v( in_place_type<std::string>, 4, 'a' );
+
+        BOOST_TEST_EQ( v.index(), 4 );
+        BOOST_TEST_EQ( get<4>(v), std::string( 4, 'a' ) );
+
+        BOOST_TEST( holds_alternative<std::string>(v) );
+    }
+
+    return boost::report_errors();
+}

test/variant_in_place_type_construct_cx.cpp

@@ -0,0 +1,110 @@
+
+// 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 X() = default;
+    constexpr explicit X(int, int) {}
+    template<class T> X( in_place_type_t<T> ) = delete;
+};
+
+#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
+
+int main()
+{
+    {
+        constexpr variant<int> v( in_place_type<int> );
+
+        STATIC_ASSERT( v.index() == 0 );
+        STATIC_ASSERT( get<0>(v) == 0 );
+
+        STATIC_ASSERT( holds_alternative<int>(v) );
+    }
+
+    {
+        constexpr variant<X> v( in_place_type<X> );
+
+        STATIC_ASSERT( v.index() == 0 );
+
+        STATIC_ASSERT( holds_alternative<X>(v) );
+    }
+
+    {
+        constexpr variant<int> v( in_place_type<int>, 1 );
+
+        STATIC_ASSERT( v.index() == 0 );
+        STATIC_ASSERT( get<0>(v) == 1 );
+
+        STATIC_ASSERT( holds_alternative<int>(v) );
+    }
+
+    {
+        constexpr variant<int, float> v( in_place_type<int> );
+
+        STATIC_ASSERT( v.index() == 0 );
+        STATIC_ASSERT( get<0>(v) == 0 );
+
+        STATIC_ASSERT( holds_alternative<int>(v) );
+    }
+
+    {
+        constexpr variant<int, float> v( in_place_type<int>, 1 );
+
+        STATIC_ASSERT( v.index() == 0 );
+        STATIC_ASSERT( get<0>(v) == 1 );
+
+        STATIC_ASSERT( holds_alternative<int>(v) );
+    }
+
+    {
+        constexpr variant<int, float> v( in_place_type<float> );
+
+        STATIC_ASSERT( v.index() == 1 );
+        STATIC_ASSERT( get<1>(v) == 0 );
+
+        STATIC_ASSERT( holds_alternative<float>(v) );
+    }
+
+    {
+        constexpr variant<int, float> v( in_place_type<float>, 3.14f );
+
+        STATIC_ASSERT( v.index() == 1 );
+        STATIC_ASSERT( get<1>(v) == 3.14f );
+
+        STATIC_ASSERT( holds_alternative<float>(v) );
+    }
+
+    {
+        constexpr variant<int, int, float, X> v( in_place_type<float>, 3.14f );
+
+        STATIC_ASSERT( v.index() == 2 );
+        STATIC_ASSERT( get<2>(v) == 3.14f );
+
+        STATIC_ASSERT( holds_alternative<float>(v) );
+    }
+
+    {
+        constexpr variant<int, int, float, float, X> v( in_place_type<X> );
+
+        STATIC_ASSERT( v.index() == 4 );
+
+        STATIC_ASSERT( holds_alternative<X>(v) );
+    }
+
+    {
+        constexpr variant<int, int, float, float, X> v( in_place_type<X>, 0, 0 );
+
+        STATIC_ASSERT( v.index() == 4 );
+
+        STATIC_ASSERT( holds_alternative<X>(v) );
+    }
+}