mirror of
https://github.com/boostorg/hana.git
synced 2026-01-24 18:02:19 +00:00
56 lines
1.3 KiB
C++
56 lines
1.3 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/assert.hpp>
|
|
#include <boost/hana/integral_constant.hpp>
|
|
#include <boost/hana/maybe.hpp>
|
|
#include <boost/hana/tuple.hpp>
|
|
|
|
#include <string>
|
|
using namespace boost::hana;
|
|
|
|
|
|
int main() {
|
|
//! [main]
|
|
using namespace std::string_literals;
|
|
|
|
BOOST_HANA_RUNTIME_CHECK(
|
|
sequence<Tuple>(
|
|
tuple(tuple("a1"s, "a2"s), tuple("b1"s), tuple("c1"s, "c2"s, "c3"s))
|
|
)
|
|
==
|
|
tuple(
|
|
tuple("a1"s, "b1"s, "c1"s),
|
|
tuple("a1"s, "b1"s, "c2"s),
|
|
tuple("a1"s, "b1"s, "c3"s),
|
|
|
|
tuple("a2"s, "b1"s, "c1"s),
|
|
tuple("a2"s, "b1"s, "c2"s),
|
|
tuple("a2"s, "b1"s, "c3"s)
|
|
)
|
|
);
|
|
|
|
BOOST_HANA_CONSTEXPR_LAMBDA auto half = [](auto x) {
|
|
return if_(x % int_<2> == int_<0>,
|
|
just(x / int_<2>),
|
|
nothing
|
|
);
|
|
};
|
|
|
|
BOOST_HANA_CONSTANT_CHECK(
|
|
traverse<Maybe>(tuple(int_<2>, int_<4>, int_<6>), half)
|
|
==
|
|
just(tuple(int_<1>, int_<2>, int_<3>))
|
|
);
|
|
|
|
BOOST_HANA_CONSTANT_CHECK(
|
|
traverse<Maybe>(tuple(int_<2>, int_<3>, int_<6>), half)
|
|
==
|
|
nothing
|
|
);
|
|
//! [main]
|
|
}
|