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36 lines
956 B
C++
36 lines
956 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/list/instance.hpp>
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#include <boost/hana/detail/constexpr.hpp>
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#include <boost/hana/detail/static_assert.hpp>
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#include <tuple>
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using namespace boost::hana;
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BOOST_HANA_CONSTEXPR_LAMBDA auto f = [](auto x, auto s) {
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return std::make_tuple(x, s);
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};
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template <int i>
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struct X {
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template <int j>
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constexpr bool operator==(X<j>) const { return i == j; }
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};
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template <int i>
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constexpr X<i> x{};
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int main() {
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constexpr auto s = x<-1>;
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BOOST_HANA_STATIC_ASSERT(foldr(f, s, list()) == s);
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BOOST_HANA_STATIC_ASSERT(foldr(f, s, list(x<0>)) == f(x<0>, s));
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BOOST_HANA_STATIC_ASSERT(foldr(f, s, list(x<0>, x<1>)) == f(x<0>, f(x<1>, s)));
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BOOST_HANA_STATIC_ASSERT(foldr(f, s, list(x<0>, x<1>, x<2>)) == f(x<0>, f(x<1>, f(x<2>, s))));
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}
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