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Peter Dimov
2017-05-29 17:31:05 +03:00
parent d4966742ae
commit fc2aa96acb
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test/variant_size.cpp
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// 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/mp11.hpp>
#include <boost/core/lightweight_test.hpp>
#include <boost/core/lightweight_test_trait.hpp>
#include <type_traits>
#include <cstddef>
using namespace boost::variant2;
using namespace boost::mp11;
template<class T> using var_size_t = mp_size_t<variant_size<T>::value>;
int main()
{
BOOST_TEST_EQ( (variant_size<variant<>>::value), 0 );
BOOST_TEST_EQ( (variant_size<variant<> const>::value), 0 );
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<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, 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, 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, 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 );
variant_size<void>();
variant_size<void const>();
variant_size<void volatile>();
variant_size<void const volatile>();
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_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>));
return boost::report_errors();
}