New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/base/base_tests/range_iterator_test.cpp

@@ -0,0 +1,43 @@
+#include "testing/testing.hpp"
+
+#include "base/range_iterator.hpp"
+
+#include <vector>
+
+UNIT_TEST(RangeIterator)
+{
+  using namespace base;
+
+  {
+    std::vector<int> result;
+    for (auto const i : UpTo(5))
+      result.push_back(i);
+    TEST_EQUAL(result, (std::vector<int>{0, 1, 2, 3, 4}), ());
+  }
+
+  {
+    std::vector<int> result;
+    for (auto const i : UpTo(2, 5))
+      result.push_back(i);
+    TEST_EQUAL(result, (std::vector<int>{2, 3, 4}), ());
+  }
+
+  {
+    std::vector<int> result;
+    for (auto const i : DownTo(5))
+      result.push_back(i);
+    TEST_EQUAL(result, (std::vector<int>{4, 3, 2, 1, 0}), ());
+  }
+
+  {
+    std::vector<int> result;
+    for (auto const i : DownTo(2, 5))
+      result.push_back(i);
+    TEST_EQUAL(result, (std::vector<int>{4, 3, 2}), ());
+  }
+
+  {
+    TEST_EQUAL(std::vector<int>(MakeRangeIterator(0), MakeRangeIterator(5)),
+               (std::vector<int>{0, 1, 2, 3, 4}), ());
+  }
+}