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88 lines
2.8 KiB
C++
88 lines
2.8 KiB
C++
#include <boost/fit/reverse_fold.hpp>
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#include "test.hpp"
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struct max_f
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{
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template<class T, class U>
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constexpr T operator()(T x, U y) const noexcept
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{
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return x > y ? x : y;
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}
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};
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struct sum_f
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{
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template<class T, class U>
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constexpr T operator()(T x, U y) const BOOST_FIT_RETURNS_DEDUCE_NOEXCEPT(x+y)
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{
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return x + y;
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}
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};
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#if BOOST_FIT_HAS_NOEXCEPT_DEDUCTION
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BOOST_FIT_TEST_CASE()
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{
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static_assert(noexcept(boost::fit::reverse_fold(max_f(), 0)(2, 3, 4, 5)), "noexcept reverse_fold");
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static_assert(noexcept(boost::fit::reverse_fold(sum_f(), 0)(2, 3, 4, 5)), "noexcept reverse_fold");
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static_assert(!noexcept(boost::fit::reverse_fold(sum_f(), std::string())("hello", "-", "world")), "noexcept reverse_fold");
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}
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#endif
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BOOST_FIT_TEST_CASE()
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{
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BOOST_FIT_TEST_CHECK(boost::fit::reverse_fold(max_f(), 0)(2, 3, 4, 5) == 5);
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BOOST_FIT_TEST_CHECK(boost::fit::reverse_fold(max_f(), 0)(5, 4, 3, 2) == 5);
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BOOST_FIT_TEST_CHECK(boost::fit::reverse_fold(max_f(), 0)(2, 3, 5, 4) == 5);
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BOOST_FIT_STATIC_TEST_CHECK(boost::fit::reverse_fold(max_f(), 0)(2, 3, 4, 5) == 5);
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BOOST_FIT_STATIC_TEST_CHECK(boost::fit::reverse_fold(max_f(), 0)(5, 4, 3, 2) == 5);
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BOOST_FIT_STATIC_TEST_CHECK(boost::fit::reverse_fold(max_f(), 0)(2, 3, 5, 4) == 5);
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}
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BOOST_FIT_TEST_CASE()
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{
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BOOST_FIT_TEST_CHECK(boost::fit::reverse_fold(max_f(), 0)() == 0);
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BOOST_FIT_TEST_CHECK(boost::fit::reverse_fold(max_f(), 0)(5) == 5);
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BOOST_FIT_STATIC_TEST_CHECK(boost::fit::reverse_fold(max_f(), 0)() == 0);
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BOOST_FIT_STATIC_TEST_CHECK(boost::fit::reverse_fold(max_f(), 0)(5) == 5);
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}
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template<class... Ts>
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constexpr auto find_positive_max(Ts... xs) BOOST_FIT_RETURNS
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(
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boost::fit::reverse_fold(max_f(), 0)(xs...)
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);
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BOOST_FIT_TEST_CASE()
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{
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BOOST_FIT_TEST_CHECK(find_positive_max() == 0);
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BOOST_FIT_TEST_CHECK(find_positive_max(5) == 5);
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BOOST_FIT_STATIC_TEST_CHECK(find_positive_max() == 0);
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BOOST_FIT_STATIC_TEST_CHECK(find_positive_max(5) == 5);
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}
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BOOST_FIT_TEST_CASE()
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{
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BOOST_FIT_TEST_CHECK(boost::fit::reverse_fold(max_f())(5) == 5);
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BOOST_FIT_STATIC_TEST_CHECK(boost::fit::reverse_fold(max_f())(5) == 5);
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}
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BOOST_FIT_TEST_CASE()
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{
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BOOST_FIT_TEST_CHECK(boost::fit::reverse_fold(max_f())(2, 3, 4, 5) == 5);
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BOOST_FIT_TEST_CHECK(boost::fit::reverse_fold(max_f())(5, 4, 3, 2) == 5);
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BOOST_FIT_TEST_CHECK(boost::fit::reverse_fold(max_f())(2, 3, 5, 4) == 5);
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BOOST_FIT_STATIC_TEST_CHECK(boost::fit::reverse_fold(max_f())(2, 3, 4, 5) == 5);
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BOOST_FIT_STATIC_TEST_CHECK(boost::fit::reverse_fold(max_f())(5, 4, 3, 2) == 5);
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BOOST_FIT_STATIC_TEST_CHECK(boost::fit::reverse_fold(max_f())(2, 3, 5, 4) == 5);
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}
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BOOST_FIT_TEST_CASE()
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{
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BOOST_FIT_TEST_CHECK(boost::fit::reverse_fold(sum_f(), std::string())("hello", "-", "world") == "world-hello");
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}
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