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- /*=============================================================================
- Copyright (c) 2017 Paul Fultz II
- fix.cpp
- Distributed under the Boost Software License, Version 1.0. (See accompanying
- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- ==============================================================================*/
- #include <boost/hof/fix.hpp>
- #include <boost/hof/static.hpp>
- #include <boost/hof/reveal.hpp>
- #include <boost/hof/result.hpp>
- #include "test.hpp"
- #include <memory>
- struct factorial_t
- {
- template<class Self, class T>
- T operator()(Self s, T x) const noexcept
- {
- return x == 0 ? 1 : x * s(x-1);
- }
- };
- struct factorial_constexpr_t
- {
- template<class Self, class T>
- constexpr T operator()(Self s, T x) const noexcept
- {
- return x == 0 ? 1 : x * s(x-1);
- }
- };
- struct factorial_move_t
- {
- std::unique_ptr<int> i;
- factorial_move_t() : i(new int(1))
- {}
- template<class Self, class T>
- T operator()(const Self& s, T x) const
- {
- return x == 0 ? *i : x * s(x-1);
- }
- };
- static constexpr boost::hof::fix_adaptor<factorial_t> factorial = {};
- static constexpr boost::hof::fix_adaptor<factorial_constexpr_t> factorial_constexpr = {};
- static constexpr boost::hof::static_<boost::hof::fix_adaptor<factorial_move_t> > factorial_move = {};
- #if BOOST_HOF_HAS_NOEXCEPT_DEDUCTION
- BOOST_HOF_TEST_CASE()
- {
- static_assert(noexcept(factorial(5)), "noexcept fix");
- }
- #endif
- BOOST_HOF_TEST_CASE()
- {
- const int r = factorial(5);
- BOOST_HOF_TEST_CHECK(r == 5*4*3*2*1);
- }
- BOOST_HOF_TEST_CASE()
- {
- const int r = boost::hof::reveal(factorial)(5);
- BOOST_HOF_TEST_CHECK(r == 5*4*3*2*1);
- }
- #if !BOOST_HOF_NO_EXPRESSION_SFINAE
- BOOST_HOF_TEST_CASE()
- {
- const int r = boost::hof::fix(boost::hof::result<int>(factorial_constexpr_t()))(5);
- BOOST_HOF_TEST_CHECK(r == 5*4*3*2*1);
- }
- BOOST_HOF_TEST_CASE()
- {
- const int r = boost::hof::result<int>(factorial_constexpr)(5);
- BOOST_HOF_TEST_CHECK(r == 5*4*3*2*1);
- }
- BOOST_HOF_TEST_CASE()
- {
- BOOST_HOF_STATIC_TEST_CHECK(boost::hof::fix(boost::hof::result<int>(factorial_constexpr_t()))(5) == 5*4*3*2*1);
- BOOST_HOF_STATIC_TEST_CHECK(boost::hof::result<int>(factorial_constexpr)(5) == 5*4*3*2*1);
- }
- #endif
- BOOST_HOF_TEST_CASE()
- {
- #if BOOST_HOF_HAS_GENERIC_LAMBDA
- auto factorial_ = boost::hof::fix([](auto s, auto x) -> decltype(x) { return x == 0 ? 1 : x * s(x-1); });
- int r = boost::hof::result<int>(factorial_)(5);
- BOOST_HOF_TEST_CHECK(r == 5*4*3*2*1);
- #endif
- }
- BOOST_HOF_TEST_CASE()
- {
- const int r = factorial_move(5);
- BOOST_HOF_TEST_CHECK(r == 5*4*3*2*1);
- BOOST_HOF_TEST_CHECK(boost::hof::fix(factorial_move_t())(5) == 5*4*3*2*1);
- }
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