hana/test/ext/std/integer_sequence/iterable.cpp

/*
@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/ext/std/integer_sequence.hpp>
#include <boost/hana/ext/std/integral_constant.hpp>

#include <boost/hana/detail/assert.hpp>

#include <test/laws/iterable.hpp>
#include <utility>
using namespace boost::hana;


int main() {
    // head
    {
        BOOST_HANA_CONSTANT_ASSERT(equal(
            head(std::index_sequence<0>{}),
            std::integral_constant<int, 0>{}
        ));
        BOOST_HANA_CONSTANT_ASSERT(equal(
            head(std::index_sequence<0, 1>{}),
            std::integral_constant<int, 0>{}
        ));
    }

    // is_empty
    {
        BOOST_HANA_CONSTANT_ASSERT(is_empty(std::index_sequence<>{}));
        BOOST_HANA_CONSTANT_ASSERT(not_(is_empty(std::index_sequence<0>{})));
        BOOST_HANA_CONSTANT_ASSERT(not_(is_empty(std::index_sequence<1>{})));
    }

    // tail
    {
        BOOST_HANA_CONSTANT_ASSERT(equal(
            tail(std::index_sequence<0>{}),
            std::index_sequence<>{}
        ));
        BOOST_HANA_CONSTANT_ASSERT(equal(
            tail(std::index_sequence<0, 1>{}),
            std::index_sequence<1>{}
        ));
        BOOST_HANA_CONSTANT_ASSERT(equal(
            tail(std::index_sequence<0, 1, 2>{}),
            std::index_sequence<1, 2>{}
        ));
    }

    // laws
    {
        BOOST_HANA_CONSTANT_ASSERT(Iterable_laws(
            std::index_sequence<>{},
            std::index_sequence<0>{},
            std::index_sequence<0, 1>{},
            std::index_sequence<0, 1, 2>{},
            std::index_sequence<0, 1, 2, 3>{}
        ));
    }
}