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Add SFINAE conditions

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This commit is contained in:
Peter Dimov
2017-05-31 07:42:45 +03:00
parent abb7b551cc
commit 7d25e131be
6 changed files with 115 additions and 21 deletions
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test/variant_copy_assign.cpp
+26
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@@ -57,6 +57,11 @@ 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 );
struct Y
{
Y& operator=( Y const& ) = delete;
};
int main()
{
{
@@ -164,5 +169,26 @@ int main()
BOOST_TEST_EQ( get<0>(v).v, 4 );
}
{
BOOST_TEST_TRAIT_TRUE((std::is_nothrow_copy_assignable<variant<int>>));
BOOST_TEST_TRAIT_TRUE((std::is_nothrow_copy_assignable<variant<int, int>>));
BOOST_TEST_TRAIT_TRUE((std::is_nothrow_copy_assignable<variant<int, float>>));
BOOST_TEST_TRAIT_TRUE((std::is_nothrow_copy_assignable<variant<int, int, float, float>>));
BOOST_TEST_TRAIT_FALSE((std::is_nothrow_copy_assignable<variant<X1>>));
BOOST_TEST_TRAIT_FALSE((std::is_nothrow_copy_assignable<variant<X1, int>>));
BOOST_TEST_TRAIT_FALSE((std::is_nothrow_copy_assignable<variant<X1, int, float>>));
BOOST_TEST_TRAIT_FALSE((std::is_nothrow_copy_assignable<variant<int, X1>>));
BOOST_TEST_TRAIT_FALSE((std::is_nothrow_copy_assignable<variant<int, int, X1>>));
BOOST_TEST_TRAIT_FALSE((std::is_nothrow_copy_assignable<variant<X1, X2>>));
BOOST_TEST_TRAIT_FALSE((std::is_nothrow_copy_assignable<variant<X1, X2, int, int>>));
BOOST_TEST_TRAIT_TRUE((std::is_copy_assignable<variant<X1, X2>>));
BOOST_TEST_TRAIT_FALSE((std::is_copy_assignable<variant<int const>>));
BOOST_TEST_TRAIT_FALSE((std::is_copy_assignable<variant<int, float, Y>>));
}
return boost::report_errors();
}