mirror of
https://github.com/boostorg/hana.git
synced 2026-02-15 01:02:10 +00:00
31 lines
1.0 KiB
C++
31 lines
1.0 KiB
C++
/*
|
|
@copyright Louis Dionne 2014
|
|
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/maybe.hpp>
|
|
|
|
#include <boost/hana/detail/constexpr.hpp>
|
|
#include <boost/hana/detail/laws.hpp>
|
|
#include <boost/hana/detail/static_assert.hpp>
|
|
#include <boost/hana/integral.hpp>
|
|
using namespace boost::hana;
|
|
|
|
|
|
int main() {
|
|
BOOST_HANA_STATIC_ASSERT(join(nothing) == nothing);
|
|
BOOST_HANA_STATIC_ASSERT(join(just(nothing)) == nothing);
|
|
BOOST_HANA_STATIC_ASSERT(join(just(just(int_<3>))) == just(int_<3>));
|
|
|
|
|
|
BOOST_HANA_CONSTEXPR_LAMBDA auto f = [](auto x) { return just(x + int_<1>); };
|
|
BOOST_HANA_CONSTEXPR_LAMBDA auto g = [](auto x) { return just(x * int_<3>); };
|
|
BOOST_HANA_CONSTEXPR_LAMBDA auto check_monad_laws = [=](auto x) {
|
|
BOOST_HANA_STATIC_ASSERT(detail::laws<Monad>(x, int_<1>, f, g));
|
|
};
|
|
check_monad_laws(nothing);
|
|
check_monad_laws(just(int_<1>));
|
|
check_monad_laws(just(1));
|
|
}
|