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28 lines
964 B
C++
28 lines
964 B
C++
/*
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@copyright Louis Dionne 2014
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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*/
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#include <boost/hana/maybe.hpp>
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#include <boost/hana/detail/constexpr.hpp>
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#include <boost/hana/detail/laws.hpp>
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#include <boost/hana/detail/static_assert.hpp>
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#include <boost/hana/integral.hpp>
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using namespace boost::hana;
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BOOST_HANA_CONSTEXPR_LAMBDA auto f = [](auto x) { return x + int_<1>; };
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BOOST_HANA_CONSTEXPR_LAMBDA auto g = [](auto x) { return x * int_<3>; };
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int main() {
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BOOST_HANA_STATIC_ASSERT(fmap(f, nothing) == nothing);
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BOOST_HANA_STATIC_ASSERT(fmap(f, just(1)) == just(2));
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BOOST_HANA_STATIC_ASSERT(fmap(f, just(int_<1>)) == just(int_<2>));
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BOOST_HANA_STATIC_ASSERT(detail::laws<Functor>(nothing, f, g));
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BOOST_HANA_STATIC_ASSERT(detail::laws<Functor>(just(int_<3>), f, g));
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BOOST_HANA_STATIC_ASSERT(detail::laws<Functor>(just(3), f, g));
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}
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