| 1 | /*============================================================================= |
| 2 | Copyright (c) 2017 Paul Fultz II |
| 3 | repeat_while.cpp |
| 4 | Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 5 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| 6 | ==============================================================================*/ |
| 7 | #include <boost/hof/repeat_while.hpp> |
| 8 | #include <boost/hof/reveal.hpp> |
| 9 | #include "test.hpp" |
| 10 | |
| 11 | // TODO: Test default construction, and static initialization |
| 12 | |
| 13 | struct increment_constant |
| 14 | { |
| 15 | template<class T> |
| 16 | constexpr std::integral_constant<int, T::value + 1> operator()(T) const noexcept |
| 17 | { |
| 18 | return std::integral_constant<int, T::value + 1>(); |
| 19 | } |
| 20 | }; |
| 21 | |
| 22 | struct increment |
| 23 | { |
| 24 | template<class T> |
| 25 | constexpr T operator()(T x) const noexcept |
| 26 | { |
| 27 | return x + 1; |
| 28 | } |
| 29 | }; |
| 30 | |
| 31 | struct not_6_constant |
| 32 | { |
| 33 | template<class T> |
| 34 | constexpr std::integral_constant<bool, (T::value != 6)> |
| 35 | operator()(T) const noexcept |
| 36 | { |
| 37 | return std::integral_constant<bool, (T::value != 6)>(); |
| 38 | } |
| 39 | }; |
| 40 | |
| 41 | struct not_6 |
| 42 | { |
| 43 | template<class T> |
| 44 | constexpr bool operator()(T x) const noexcept |
| 45 | { |
| 46 | return x != 6; |
| 47 | } |
| 48 | }; |
| 49 | |
| 50 | struct not_limit |
| 51 | { |
| 52 | template<class T> |
| 53 | constexpr bool operator()(T x) const |
| 54 | { |
| 55 | return x != (BOOST_HOF_RECURSIVE_CONSTEXPR_DEPTH+4); |
| 56 | } |
| 57 | }; |
| 58 | |
| 59 | #if BOOST_HOF_HAS_NOEXCEPT_DEDUCTION |
| 60 | BOOST_HOF_TEST_CASE() |
| 61 | { |
| 62 | static_assert(noexcept(boost::hof::repeat_while(not_6())(increment())(1)), "noexcept repeat_while" ); |
| 63 | static_assert(noexcept(boost::hof::repeat_while(not_6_constant())(increment_constant())(std::integral_constant<int, 1>())), "noexcept repeat_while" ); |
| 64 | } |
| 65 | #endif |
| 66 | |
| 67 | BOOST_HOF_TEST_CASE() |
| 68 | { |
| 69 | static_assert |
| 70 | ( |
| 71 | std::is_same< |
| 72 | std::integral_constant<int, 6>, |
| 73 | decltype(boost::hof::repeat_while(not_6_constant())(increment_constant())(std::integral_constant<int, 1>())) |
| 74 | >::value, |
| 75 | "Error" |
| 76 | ); |
| 77 | |
| 78 | std::integral_constant<int, 6> x = boost::hof::repeat_while(not_6_constant())(increment_constant())(std::integral_constant<int, 1>()); |
| 79 | boost::hof::test::unused(x); |
| 80 | } |
| 81 | |
| 82 | BOOST_HOF_TEST_CASE() |
| 83 | { |
| 84 | BOOST_HOF_STATIC_TEST_CHECK(boost::hof::repeat_while(not_6())(increment())(1) == 6); |
| 85 | BOOST_HOF_TEST_CHECK(boost::hof::repeat_while(not_6())(increment())(1) == 6); |
| 86 | BOOST_HOF_TEST_CHECK(boost::hof::reveal(boost::hof::repeat_while(not_6())(increment()))(1) == 6); |
| 87 | } |
| 88 | |
| 89 | BOOST_HOF_TEST_CASE() |
| 90 | { |
| 91 | BOOST_HOF_TEST_CHECK(boost::hof::repeat_while(not_limit())(increment())(1) == BOOST_HOF_RECURSIVE_CONSTEXPR_DEPTH+4); |
| 92 | #if BOOST_HOF_HAS_RELAXED_CONSTEXPR |
| 93 | BOOST_HOF_STATIC_TEST_CHECK(boost::hof::repeat_while(not_limit())(increment())(1) == BOOST_HOF_RECURSIVE_CONSTEXPR_DEPTH+4); |
| 94 | #endif |
| 95 | } |
| 96 | |