mirror of https://gitee.com/bigwinds/arangodb
143 lines
3.7 KiB
C++
143 lines
3.7 KiB
C++
// Copyright Louis Dionne 2013-2016
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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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#include <boost/hana.hpp>
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#include <boost/hana/assert.hpp>
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#include <boost/hana/functional/always.hpp>
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#include <boost/hana/functional/compose.hpp>
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#include <boost/hana/tuple.hpp>
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#include <laws/applicative.hpp>
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#include <laws/base.hpp>
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#include <laws/functor.hpp>
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#include <laws/monad.hpp>
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#include <support/cnumeric.hpp>
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#include <support/identity.hpp>
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using namespace boost::hana;
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int main() {
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using test::ct_eq;
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test::_injection<0> f{};
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// Functor
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{
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auto functor = ::identity;
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// adjust_if
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{
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BOOST_HANA_CONSTANT_CHECK(equal(
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adjust_if(functor(ct_eq<0>{}), always(cnumeric<bool, true>), f),
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functor(f(ct_eq<0>{}))
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));
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BOOST_HANA_CONSTANT_CHECK(equal(
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adjust_if(functor(ct_eq<0>{}), always(cnumeric<bool, false>), f),
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functor(ct_eq<0>{})
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));
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}
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// fill
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{
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BOOST_HANA_CONSTANT_CHECK(equal(
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fill(functor(ct_eq<0>{}), ct_eq<1>{}),
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functor(ct_eq<1>{})
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));
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}
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// transform
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{
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BOOST_HANA_CONSTANT_CHECK(equal(
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transform(functor(ct_eq<0>{}), f),
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functor(f(ct_eq<0>{}))
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));
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}
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// replace_if
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{
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BOOST_HANA_CONSTANT_CHECK(equal(
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replace_if(functor(ct_eq<0>{}), always(cnumeric<bool, true>), ct_eq<1>{}),
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functor(ct_eq<1>{})
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));
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BOOST_HANA_CONSTANT_CHECK(equal(
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replace_if(functor(ct_eq<0>{}), always(cnumeric<bool, false>), ct_eq<1>{}),
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functor(ct_eq<0>{})
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));
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}
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}
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// Applicative
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{
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auto a = ::identity;
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using A = ::Identity;
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// ap
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{
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BOOST_HANA_CONSTANT_CHECK(equal(
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ap(a(f), a(ct_eq<0>{})),
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a(f(ct_eq<0>{}))
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));
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BOOST_HANA_CONSTANT_CHECK(equal(
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ap(a(f), a(ct_eq<0>{}), a(ct_eq<1>{})),
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a(f(ct_eq<0>{}, ct_eq<1>{}))
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));
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BOOST_HANA_CONSTANT_CHECK(equal(
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ap(a(f), a(ct_eq<0>{}), a(ct_eq<1>{}), a(ct_eq<2>{})),
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a(f(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}))
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));
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BOOST_HANA_CONSTANT_CHECK(equal(
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ap(a(f), a(ct_eq<0>{}), a(ct_eq<1>{}), a(ct_eq<2>{}), a(ct_eq<3>{})),
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a(f(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{}))
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));
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}
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// lift
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{
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BOOST_HANA_CONSTANT_CHECK(equal(
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lift<A>(ct_eq<0>{}),
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a(ct_eq<0>{})
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));
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}
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}
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// Monad
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{
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auto monad = ::identity;
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using M = ::Identity;
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auto f = compose(monad, test::_injection<0>{});
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// chain
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{
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BOOST_HANA_CONSTANT_CHECK(equal(
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chain(monad(ct_eq<1>{}), f),
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f(ct_eq<1>{})
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));
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}
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// tap
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{
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bool executed = false;
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auto exec = [&](auto) { executed = true; };
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BOOST_HANA_CONSTANT_CHECK(equal(
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chain(monad(ct_eq<0>{}), tap<M>(exec)),
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monad(ct_eq<0>{})
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));
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BOOST_HANA_RUNTIME_CHECK(executed);
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}
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// then
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{
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struct invalid { };
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BOOST_HANA_CONSTANT_CHECK(equal(
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then(monad(invalid{}), monad(ct_eq<0>{})),
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monad(ct_eq<0>{})
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));
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}
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}
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}
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