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empty_value_size_test.cpp
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60 lines (49 loc) · 1.26 KB
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/*
Copyright 2018 Glen Joseph Fernandes
(glenjofe@gmail.com)
Distributed under the Boost Software License, Version 1.0.
(http://www.boost.org/LICENSE_1_0.txt)
*/
#include <boost/config.hpp>
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
#include <boost/core/empty_value.hpp>
#include <boost/core/lightweight_test.hpp>
struct T1 { };
struct S1
: boost::empty_value<T1, 0, true> { };
struct T2 {
int value;
};
struct S2
: boost::empty_value<T1, 0, true>
, boost::empty_value<T2, 1, true> { };
struct S3
: boost::empty_value<T1, 0, false>
, boost::empty_value<T2, 1, true> { };
struct T3 { };
struct S4
: boost::empty_value<T1, 0, true>
, boost::empty_value<T3, 1, true> { };
struct S5
: boost::empty_value<T1, 0, false>
, boost::empty_value<T3, 1, false> { };
struct S6
: boost::empty_value<T1, 0, true>
, boost::empty_value<T2, 1, true>
, boost::empty_value<T3, 2, true> { };
int main()
{
BOOST_TEST(sizeof(S1) == sizeof(T1));
BOOST_TEST(sizeof(S2) == sizeof(T2));
BOOST_TEST(sizeof(S3) > sizeof(T2));
BOOST_TEST(sizeof(S4) == sizeof(T1));
BOOST_TEST(sizeof(S5) > sizeof(T1));
BOOST_TEST(sizeof(S6) == sizeof(T2));
return boost::report_errors();
}
#else
int main()
{
return 0;
}
#endif