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48 lines
1.6 KiB
C++
48 lines
1.6 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2017 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#include <sprout/workaround/std/cstddef.hpp>
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#include <sprout/array.hpp>
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#include <sprout/tuple/tuple.hpp>
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#include <sprout/operation/push_back.hpp>
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#include <sprout/operation/append_back.hpp>
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#include <sprout/integer/static_pow.hpp>
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#include <sprout/type_traits/enabler_if.hpp>
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//
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// hanoi
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//
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template<
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std::size_t N, typename Id,
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typename sprout::enabler_if<(N == 0)>::type = sprout::enabler
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>
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SPROUT_CONSTEXPR sprout::array<sprout::tuple<Id, Id, std::size_t>, 0>
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hanoi(Id, Id, Id) {
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return sprout::array<sprout::tuple<Id, Id, std::size_t>, 0>{{}};
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}
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template<
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std::size_t N, typename Id,
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typename sprout::enabler_if<(N != 0)>::type = sprout::enabler
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>
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SPROUT_CONSTEXPR sprout::array<sprout::tuple<Id, Id, std::size_t>, sprout::static_pow2m1<std::size_t, N>::value>
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hanoi(Id a, Id b, Id c) {
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typedef sprout::tuple<Id, Id, std::size_t> type;
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return sprout::append_back(
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sprout::push_back(hanoi<N - 1>(a, c, b), type(a, b, N)),
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hanoi<N - 1>(c, b, a)
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);
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}
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#include <iostream>
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int main() {
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constexpr auto answer = hanoi<8>('a', 'b', 'c');
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for (auto const& e : answer) {
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std::cout << "disk " << sprout::get<2>(e) << ": " << sprout::get<0>(e) << " -> " << sprout::get<1>(e) << std::endl;
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}
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}
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