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arangodb/3rdParty/boost/1.62.0/libs/hana/test/pair/cnstr.default.cpp

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C++

// Copyright Louis Dionne 2013-2016
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
#include <boost/hana/assert.hpp>
#include <boost/hana/first.hpp>
#include <boost/hana/pair.hpp>
#include <boost/hana/second.hpp>
namespace hana = boost::hana;
struct NoDefault {
NoDefault() = delete;
explicit constexpr NoDefault(int) { }
};
struct DefaultOnly {
DefaultOnly() = default;
DefaultOnly(DefaultOnly const&) = delete;
DefaultOnly(DefaultOnly&&) = delete;
};
struct NonConstexprDefault {
NonConstexprDefault() { }
};
int main() {
{
hana::pair<float, short*> p;
BOOST_HANA_RUNTIME_CHECK(hana::first(p) == 0.0f);
BOOST_HANA_RUNTIME_CHECK(hana::second(p) == nullptr);
}
// make sure it also works constexpr
{
constexpr hana::pair<float, short*> p;
static_assert(hana::first(p) == 0.0f, "");
static_assert(hana::second(p) == nullptr, "");
}
// make sure the default constructor is not instantiated when the
// members of the pair are not default-constructible
{
hana::pair<NoDefault, NoDefault> p{NoDefault{1}, NoDefault{2}};
(void)p;
}
// make sure it works when only the default constructor is defined
{
hana::pair<DefaultOnly, DefaultOnly> p;
(void)p;
}
{
hana::pair<NonConstexprDefault, NonConstexprDefault> p;
(void)p;
}
}