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- /*=============================================================================
- Copyright (c) 2017 Paul Fultz II
- fold.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/fold.hpp>
- #include "test.hpp"
- struct max_f
- {
- template<class T, class U>
- constexpr T operator()(T x, U y) const noexcept
- {
- return x > y ? x : y;
- }
- };
- struct sum_f
- {
- template<class T, class U>
- constexpr T operator()(T x, U y) const BOOST_HOF_RETURNS_DEDUCE_NOEXCEPT(x+y)
- {
- return x + y;
- }
- };
- #if BOOST_HOF_HAS_NOEXCEPT_DEDUCTION
- BOOST_HOF_TEST_CASE()
- {
- static_assert(noexcept(boost::hof::fold(max_f(), 0)(2, 3, 4, 5)), "noexcept fold");
- static_assert(noexcept(boost::hof::fold(sum_f(), 0)(2, 3, 4, 5)), "noexcept fold");
- static_assert(!noexcept(boost::hof::fold(sum_f(), std::string())("hello", "-", "world")), "noexcept fold");
- }
- #endif
- BOOST_HOF_TEST_CASE()
- {
- BOOST_HOF_TEST_CHECK(boost::hof::fold(max_f(), 0)(2, 3, 4, 5) == 5);
- BOOST_HOF_TEST_CHECK(boost::hof::fold(max_f(), 0)(5, 4, 3, 2) == 5);
- BOOST_HOF_TEST_CHECK(boost::hof::fold(max_f(), 0)(2, 3, 5, 4) == 5);
- BOOST_HOF_STATIC_TEST_CHECK(boost::hof::fold(max_f(), 0)(2, 3, 4, 5) == 5);
- BOOST_HOF_STATIC_TEST_CHECK(boost::hof::fold(max_f(), 0)(5, 4, 3, 2) == 5);
- BOOST_HOF_STATIC_TEST_CHECK(boost::hof::fold(max_f(), 0)(2, 3, 5, 4) == 5);
- }
- BOOST_HOF_TEST_CASE()
- {
- BOOST_HOF_TEST_CHECK(boost::hof::fold(max_f(), 0)() == 0);
- BOOST_HOF_TEST_CHECK(boost::hof::fold(max_f(), 0)(5) == 5);
- BOOST_HOF_STATIC_TEST_CHECK(boost::hof::fold(max_f(), 0)() == 0);
- BOOST_HOF_STATIC_TEST_CHECK(boost::hof::fold(max_f(), 0)(5) == 5);
- }
- template<class... Ts>
- constexpr auto find_positive_max(Ts... xs) BOOST_HOF_RETURNS
- (
- boost::hof::fold(max_f(), 0)(xs...)
- );
- BOOST_HOF_TEST_CASE()
- {
- BOOST_HOF_TEST_CHECK(find_positive_max() == 0);
- BOOST_HOF_TEST_CHECK(find_positive_max(5) == 5);
- BOOST_HOF_STATIC_TEST_CHECK(find_positive_max() == 0);
- BOOST_HOF_STATIC_TEST_CHECK(find_positive_max(5) == 5);
- }
- BOOST_HOF_TEST_CASE()
- {
- BOOST_HOF_TEST_CHECK(boost::hof::fold(max_f())(5) == 5);
- BOOST_HOF_STATIC_TEST_CHECK(boost::hof::fold(max_f())(5) == 5);
- }
- BOOST_HOF_TEST_CASE()
- {
- BOOST_HOF_TEST_CHECK(boost::hof::fold(max_f())(2, 3, 4, 5) == 5);
- BOOST_HOF_TEST_CHECK(boost::hof::fold(max_f())(5, 4, 3, 2) == 5);
- BOOST_HOF_TEST_CHECK(boost::hof::fold(max_f())(2, 3, 5, 4) == 5);
- BOOST_HOF_STATIC_TEST_CHECK(boost::hof::fold(max_f())(2, 3, 4, 5) == 5);
- BOOST_HOF_STATIC_TEST_CHECK(boost::hof::fold(max_f())(5, 4, 3, 2) == 5);
- BOOST_HOF_STATIC_TEST_CHECK(boost::hof::fold(max_f())(2, 3, 5, 4) == 5);
- }
- BOOST_HOF_TEST_CASE()
- {
- BOOST_HOF_TEST_CHECK(boost::hof::fold(sum_f(), std::string())("hello", "-", "world") == "hello-world");
- }
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