// Copyright (C) 2018 Jonathan Müller <jonathanmueller.dev@gmail.com>

// This file is subject to the license terms in the LICENSE file

// found in the top-level directory of this distribution.

#include <foonathan/array/pointer_iterator.hpp>

#include <catch.hpp>

using namespace foonathan::array;

TEST_CASE("pointer_iterator", "[core]")

{

struct tag

{

};

using iter = pointer_iterator<tag, int>;

REQUIRE(is_contiguous_iterator<iter>::value);

SECTION("default")

{

iter def;

REQUIRE(def.operator->() == nullptr);

REQUIRE(iterator_to_pointer(def) == nullptr);

}

SECTION("non-default")

{

int array[] = {0, 1, 2, 3};

auto begin = iter(tag{}, array);

REQUIRE(begin.operator->() == array);

REQUIRE(iterator_to_pointer(begin) == array);

auto end = iter(tag{}, array + 4);

REQUIRE(end.operator->() == array + 4);

REQUIRE(iterator_to_pointer(end) == array + 4);

SECTION("access")

{

REQUIRE(*begin == 0);

REQUIRE(begin[2] == 2);

}

SECTION("increment/decrement")

{

++begin;

REQUIRE(begin.operator->() == array + 1);

REQUIRE(begin++.operator->() == array + 1);

REQUIRE(begin.operator->() == array + 2);

--begin;

REQUIRE(begin.operator->() == array + 1);

REQUIRE(begin--.operator->() == array + 1);

REQUIRE(begin.operator->() == array);

}

SECTION("+/-")

{

begin += 2;

REQUIRE(begin.operator->() == array + 2);

REQUIRE((begin - 1).operator->() == array + 1);

begin -= 2;

REQUIRE(begin.operator->() == array);

REQUIRE((begin + 1).operator->() == array + 1);

}

SECTION("distance")

{

REQUIRE(end - begin == 4);

REQUIRE(begin - end == -4);

}

SECTION("comparision")

{

REQUIRE(begin == begin);

REQUIRE(begin != end);

REQUIRE(begin < end);

REQUIRE(begin <= begin);

REQUIRE(begin <= end);

REQUIRE(end > begin);

REQUIRE(end >= begin);

REQUIRE(end >= end);

}

}

}