New cpp folder structure

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

libs/base/collection_cast.hpp

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <type_traits>
+
+namespace base
+{
+namespace details
+{
+template <typename T>
+struct ValueType
+{
+  using TType = typename std::remove_reference_t<T>::value_type;
+};
+
+template <typename T>
+using TValueType = typename ValueType<T>::TType;
+}  // namespace details
+
+// Use this function to cast one collection to annother.
+// I.E. list<int> const myList = collection_cast<list>(vector<int>{1, 2, 4, 5});
+// More examples:
+// auto const mySet = collection_cast<set>("aaabcccd");
+// auto const myMap = collection_cast<map>(vector<pair<int, int>>{{1, 2}, {3, 4}});
+template <template<typename ... TArgs> class TTo, typename TFrom>
+auto collection_cast(TFrom && from) -> TTo<details::TValueType<TFrom>>
+{
+  return TTo<details::TValueType<TFrom>>(begin(from), end(from));
+}
+}  // namespace base