Initial commit with solutions from 2024

src/common/lib/Mapper.h

@@ -0,0 +1,75 @@
+#pragma once
+
+#include <map>
+
+template <typename T, typename S>
+struct Mapper
+{
+  std::map<T, S> map1;
+  std::map<S, T> map2;
+
+  Mapper()
+  {
+  }
+
+  Mapper(const std::map<T, S>& map)
+    : map1{map}
+  {
+    for (auto&& elem : map)
+    {
+      auto&& res = map2.emplace({elem.second, elem.first});
+      if (!res.first)
+      {
+        map1.clear();
+        map2.clear();
+        std::cout << "Mapper : mappings are not unique : " << elem.second << std::endl;
+        return;
+      }
+    }
+  }
+
+  Mapper(const std::initializer_list<std::pair<T, S>>& map)
+  {
+    for (auto&& elem : map)
+    {
+      auto&& res = map1.emplace(elem.first, elem.second);
+      if (!res.second)
+      {
+        map1.clear();
+        map2.clear();
+        std::cout << "Mapper : mappings are not unique : " << elem.first << std::endl;
+        return;
+      }
+      auto&& res2 = map2.emplace(elem.second, elem.first);
+      if (!res2.second)
+      {
+        map1.clear();
+        map2.clear();
+        std::cout << "Mapper : mappings are not unique : " << elem.second << std::endl;
+        return;
+      }
+    }
+  }
+
+  void Emplace(const T& t, const S& s)
+  {
+    map1.emplace(t, s);
+    map2.emplace(s, t);
+  }
+
+  T* GetFirst(const S& key)
+  {
+    auto it = map2.find(key);
+    if (it == map2.end())
+      return nullptr;
+    return &it->second;
+  }
+
+  S* GetSecond(const T& key)
+  {
+    auto it = map1.find(key);
+    if (it == map1.end())
+      return nullptr;
+    return &it->second;
+  }
+};