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104 lines
3.3 KiB
C++
104 lines
3.3 KiB
C++
// Range v3 library
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//
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// Copyright Eric Niebler 2014-present
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//
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// Use, modification and distribution is subject to the
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// Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// Project home: https://github.com/ericniebler/range-v3
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//
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//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include <cmath>
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#include <functional>
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#include <range/v3/algorithm/fold.hpp>
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#include <range/v3/algorithm/min.hpp>
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#include <range/v3/core.hpp>
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#include "../simple_test.hpp"
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#include "../test_iterators.hpp"
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struct Approx
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{
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double value;
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Approx(double v)
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: value(v)
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{}
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friend bool operator==(Approx a, double d)
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{
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return std::fabs(a.value - d) < 0.001;
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}
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friend bool operator==(double d, Approx a)
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{
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return a == d;
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}
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};
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template<class Iter, class Sent = Iter>
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void test_left()
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{
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double da[] = {0.25, 0.75};
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CHECK(ranges::fold_left(Iter(da), Sent(da), 1, std::plus<>()) == Approx{1.0});
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CHECK(ranges::fold_left(Iter(da), Sent(da + 2), 1, std::plus<>()) == Approx{2.0});
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CHECK(ranges::fold_left_first(Iter(da), Sent(da), ranges::min) == ranges::nullopt);
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CHECK(ranges::fold_left_first(Iter(da), Sent(da + 2), ranges::min) ==
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ranges::optional<Approx>(0.25));
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using ranges::make_subrange;
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CHECK(ranges::fold_left(make_subrange(Iter(da), Sent(da)), 1, std::plus<>()) ==
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Approx{1.0});
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CHECK(ranges::fold_left(make_subrange(Iter(da), Sent(da + 2)), 1, std::plus<>()) ==
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Approx{2.0});
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CHECK(ranges::fold_left_first(make_subrange(Iter(da), Sent(da)), ranges::min) ==
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ranges::nullopt);
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CHECK(ranges::fold_left_first(make_subrange(Iter(da), Sent(da + 2)), ranges::min) ==
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ranges::optional<Approx>(0.25));
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}
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void test_right()
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{
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double da[] = {0.25, 0.75};
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CHECK(ranges::fold_right(da, da + 2, 1, std::plus<>()) == Approx{2.0});
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CHECK(ranges::fold_right(da, 1, std::plus<>()) == Approx{2.0});
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// f(0.25, f(0.75, 1))
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CHECK(ranges::fold_right(da, da + 2, 1, std::minus<>()) == Approx{0.5});
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CHECK(ranges::fold_right(da, 1, std::minus<>()) == Approx{0.5});
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int xs[] = {1, 2, 3};
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auto concat = [](int i, std::string s) { return s + std::to_string(i); };
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CHECK(ranges::fold_right(xs, xs + 2, std::string(), concat) == "21");
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CHECK(ranges::fold_right(xs, std::string(), concat) == "321");
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}
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int main()
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{
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test_left<InputIterator<const double *>>();
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test_left<ForwardIterator<const double *>>();
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test_left<BidirectionalIterator<const double *>>();
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test_left<RandomAccessIterator<const double *>>();
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test_left<const double *>();
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test_left<InputIterator<const double *>, Sentinel<const double *>>();
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test_left<ForwardIterator<const double *>, Sentinel<const double *>>();
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test_left<BidirectionalIterator<const double *>, Sentinel<const double *>>();
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test_left<RandomAccessIterator<const double *>, Sentinel<const double *>>();
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test_right();
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return ::test_result();
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}
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