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