Squashed 'external/entt/entt/' content from commit fef92113

git-subtree-dir: external/entt/entt
git-subtree-split: fef921132cae7588213d0f9bcd2fb9c8ffd8b7fc

test/entt/core/iterator.cpp

@@ -0,0 +1,55 @@
+#include <cstddef>
+#include <type_traits>
+#include <utility>
+#include <vector>
+#include <gtest/gtest.h>
+#include <entt/core/iterator.hpp>
+
+struct clazz {
+    int value{0};
+};
+
+TEST(InputIteratorPointer, Functionalities) {
+    clazz instance{};
+    entt::input_iterator_pointer ptr{std::move(instance)};
+    ptr->value = 42;
+
+    ASSERT_EQ(instance.value, 0);
+    ASSERT_EQ(ptr->value, 42);
+    ASSERT_EQ(ptr->value, (*ptr).value);
+    ASSERT_EQ(ptr.operator->(), &ptr.operator*());
+}
+
+TEST(IotaIterator, Functionalities) {
+    entt::iota_iterator<std::size_t> first{};
+    const entt::iota_iterator<std::size_t> last{2u};
+
+    ASSERT_NE(first, last);
+    ASSERT_FALSE(first == last);
+    ASSERT_TRUE(first != last);
+
+    ASSERT_EQ(*first++, 0u);
+    ASSERT_EQ(*first, 1u);
+    ASSERT_EQ(*++first, *last);
+    ASSERT_EQ(*first, 2u);
+}
+
+TEST(IterableAdaptor, Functionalities) {
+    std::vector<int> vec{1, 2};
+    entt::iterable_adaptor iterable{vec.begin(), vec.end()};
+    decltype(iterable) other{};
+
+    ASSERT_NO_FATAL_FAILURE(other = iterable);
+    ASSERT_NO_FATAL_FAILURE(std::swap(other, iterable));
+
+    ASSERT_EQ(iterable.begin(), vec.begin());
+    ASSERT_EQ(iterable.end(), vec.end());
+
+    ASSERT_EQ(*iterable.cbegin(), 1);
+    ASSERT_EQ(*++iterable.cbegin(), 2);
+    ASSERT_EQ(++iterable.cbegin(), --iterable.end());
+
+    for(auto value: entt::iterable_adaptor<const int *, const void *>{vec.data(), vec.data() + 1u}) {
+        ASSERT_EQ(value, 1);
+    }
+}