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Add reference specializations to variant_size

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This commit is contained in:
Peter Dimov
2019-02-21 21:57:39 +02:00
parent f67a6bd2ae
commit cf3ea64b45
2 changed files with 48 additions and 0 deletions
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8
include/boost/variant2/variant.hpp
View File

@ -83,6 +83,14 @@ template<class T> struct variant_size<T const volatile>: variant_size<T>
{
};
template<class T> struct variant_size<T&>: variant_size<T>
{
};
template<class T> struct variant_size<T&&>: variant_size<T>
{
};
#if !defined(BOOST_NO_CXX14_VARIABLE_TEMPLATES)
template <class T> /*inline*/ constexpr std::size_t variant_size_v = variant_size<T>::value;

40
test/variant_size.cpp
View File

@ -25,40 +25,80 @@ int main()
BOOST_TEST_EQ( (variant_size<variant<> volatile>::value), 0 );
BOOST_TEST_EQ( (variant_size<variant<> const volatile>::value), 0 );
BOOST_TEST_EQ( (variant_size<variant<>&>::value), 0 );
BOOST_TEST_EQ( (variant_size<variant<> const&>::value), 0 );
BOOST_TEST_EQ( (variant_size<variant<>&&>::value), 0 );
BOOST_TEST_EQ( (variant_size<variant<> const&&>::value), 0 );
BOOST_TEST_EQ( (variant_size<variant<void>>::value), 1 );
BOOST_TEST_EQ( (variant_size<variant<void> const>::value), 1 );
BOOST_TEST_EQ( (variant_size<variant<void> volatile>::value), 1 );
BOOST_TEST_EQ( (variant_size<variant<void> const volatile>::value), 1 );
BOOST_TEST_EQ( (variant_size<variant<void>&>::value), 1 );
BOOST_TEST_EQ( (variant_size<variant<void> const&>::value), 1 );
BOOST_TEST_EQ( (variant_size<variant<void>&&>::value), 1 );
BOOST_TEST_EQ( (variant_size<variant<void> const&&>::value), 1 );
BOOST_TEST_EQ( (variant_size<variant<void, void>>::value), 2 );
BOOST_TEST_EQ( (variant_size<variant<void, void> const>::value), 2 );
BOOST_TEST_EQ( (variant_size<variant<void, void> volatile>::value), 2 );
BOOST_TEST_EQ( (variant_size<variant<void, void> const volatile>::value), 2 );
BOOST_TEST_EQ( (variant_size<variant<void, void>&>::value), 2 );
BOOST_TEST_EQ( (variant_size<variant<void, void> const&>::value), 2 );
BOOST_TEST_EQ( (variant_size<variant<void, void>&&>::value), 2 );
BOOST_TEST_EQ( (variant_size<variant<void, void> const&&>::value), 2 );
BOOST_TEST_EQ( (variant_size<variant<void, void, void>>::value), 3 );
BOOST_TEST_EQ( (variant_size<variant<void, void, void> const>::value), 3 );
BOOST_TEST_EQ( (variant_size<variant<void, void, void> volatile>::value), 3 );
BOOST_TEST_EQ( (variant_size<variant<void, void, void> const volatile>::value), 3 );
BOOST_TEST_EQ( (variant_size<variant<void, void, void>&>::value), 3 );
BOOST_TEST_EQ( (variant_size<variant<void, void, void> const&>::value), 3 );
BOOST_TEST_EQ( (variant_size<variant<void, void, void>&&>::value), 3 );
BOOST_TEST_EQ( (variant_size<variant<void, void, void> const&&>::value), 3 );
BOOST_TEST_EQ( (variant_size<variant<void, void, void, void>>::value), 4 );
BOOST_TEST_EQ( (variant_size<variant<void, void, void, void> const>::value), 4 );
BOOST_TEST_EQ( (variant_size<variant<void, void, void, void> volatile>::value), 4 );
BOOST_TEST_EQ( (variant_size<variant<void, void, void, void> const volatile>::value), 4 );
BOOST_TEST_EQ( (variant_size<variant<void, void, void, void>&>::value), 4 );
BOOST_TEST_EQ( (variant_size<variant<void, void, void, void> const&>::value), 4 );
BOOST_TEST_EQ( (variant_size<variant<void, void, void, void>&&>::value), 4 );
BOOST_TEST_EQ( (variant_size<variant<void, void, void, void> const&&>::value), 4 );
variant_size<void>();
variant_size<void const>();
variant_size<void volatile>();
variant_size<void const volatile>();
variant_size<int&>();
variant_size<int const&>();
variant_size<int&&>();
variant_size<int const&&>();
BOOST_TEST_TRAIT_FALSE((mp_valid<var_size_t, void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<var_size_t, void const>));
BOOST_TEST_TRAIT_FALSE((mp_valid<var_size_t, void volatile>));
BOOST_TEST_TRAIT_FALSE((mp_valid<var_size_t, void const volatile>));
BOOST_TEST_TRAIT_FALSE((mp_valid<var_size_t, int&>));
BOOST_TEST_TRAIT_FALSE((mp_valid<var_size_t, int const&>));
BOOST_TEST_TRAIT_FALSE((mp_valid<var_size_t, int&&>));
BOOST_TEST_TRAIT_FALSE((mp_valid<var_size_t, int const&&>));
BOOST_TEST_TRAIT_TRUE((mp_valid<var_size_t, variant<>>));
BOOST_TEST_TRAIT_TRUE((mp_valid<var_size_t, variant<> const>));
BOOST_TEST_TRAIT_TRUE((mp_valid<var_size_t, variant<> volatile>));
BOOST_TEST_TRAIT_TRUE((mp_valid<var_size_t, variant<> const volatile>));
BOOST_TEST_TRAIT_TRUE((mp_valid<var_size_t, variant<>&>));
BOOST_TEST_TRAIT_TRUE((mp_valid<var_size_t, variant<> const&>));
BOOST_TEST_TRAIT_TRUE((mp_valid<var_size_t, variant<>&&>));
BOOST_TEST_TRAIT_TRUE((mp_valid<var_size_t, variant<> const&&>));
return boost::report_errors();
}