44 lines
1.0 KiB
C++
44 lines
1.0 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/detail/variadic/foldl1.hpp>
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template <typename ...xs>
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struct list { };
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template <typename T>
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struct basic_type { using type = T; };
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template <typename T>
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constexpr basic_type<T> type{};
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template <typename F, typename State, typename ...Xs>
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constexpr auto foldl(F f, State s, list<Xs...> xs)
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{ return boost::hana::detail::variadic::foldl(f, s, type<Xs>...); }
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//////////////////////////////////////////////////////////////////////////////
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struct f {
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template <typename ...>
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struct result { };
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template <typename X, typename Y>
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constexpr auto operator()(X, Y) const
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{ return result<X, Y>{}; }
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};
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template <int> struct x { };
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struct state { };
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int main() {
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constexpr auto xs = list<
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<%= (1..input_size).map { |i| "x<#{i}>" }.join(', ') %>
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>{};
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constexpr auto result = foldl(f{}, state{}, xs);
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(void)result;
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}
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