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- // Copyright Louis Dionne 2013-2017
- // 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/functional/overload_linearly.hpp>
- #include <boost/hana/assert.hpp>
- #include <boost/hana/equal.hpp>
- #include <laws/base.hpp>
- namespace hana = boost::hana;
- using hana::test::ct_eq;
- struct A { };
- struct AA : A { };
- struct B { };
- struct C { };
- int main() {
- // 2 functions without overlap
- {
- auto f = hana::overload_linearly(
- [](A) { return ct_eq<0>{}; },
- [](B) { return ct_eq<1>{}; }
- );
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- f(A{}),
- ct_eq<0>{}
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- f(AA{}),
- f(A{})
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- f(B{}),
- ct_eq<1>{}
- ));
- }
- // 2 functions with overlap
- {
- auto f = hana::overload_linearly(
- [](A) { return ct_eq<0>{}; },
- [](A) { return ct_eq<1>{}; }
- );
- auto g = hana::overload_linearly(
- [](A) { return ct_eq<0>{}; },
- [](AA) { return ct_eq<1>{}; }
- );
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- f(A{}),
- ct_eq<0>{}
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- f(AA{}),
- f(A{})
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- g(A{}),
- ct_eq<0>{}
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- g(AA{}),
- g(A{})
- ));
- }
- // 3 functions
- {
- auto f = hana::overload_linearly(
- [](A) { return ct_eq<0>{}; },
- [](B) { return ct_eq<1>{}; },
- [](C) { return ct_eq<2>{}; }
- );
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- f(A{}),
- ct_eq<0>{}
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- f(AA{}),
- f(A{})
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- f(B{}),
- ct_eq<1>{}
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- f(C{}),
- ct_eq<2>{}
- ));
- }
- // 1 function (github issue #280)
- {
- auto f = hana::overload_linearly(
- [](A) { return ct_eq<0>{}; }
- );
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- f(A{}),
- ct_eq<0>{}
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- f(AA{}),
- f(A{})
- ));
- }
- }
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